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Thread: Basic Java maze game

  1. #1
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    Unhappy Basic Java maze game

    Hi there, I really could use some help to get a simple text based java maze game to work properly. I understand all the logic fine, however im finding java really hard compared to C# which i find a breeze for some reason. The game I'm trying to create is supposed to read the maze layout from a ".txt" file and then display it on the screen however it must store the values in some kind of 2D array so that it can check for the player moving into walls. Then obviosly the main problem im facing now, well i think its the main problem with my game is that I cant get the keyboard inputs to change to values e.g if the "w" key is pressed then to check if the character in the array position 1 up in the y is a wall or space then if its a space change that value to the players value and the players last location to a space.

    heres the code i have so far remember im not that good at this and some of this coude probably doesnt do anything or just complicates things however any help would be greatly appreciated.

    The TextIO class doesn't need to be changed, well as far as i belive.

    main.java //////////////////////////////////////////////////////////

    public class main {
     
    	public static void display(String[] args) {
     
    	}
    }
    [COLOR="Blue"] END OF MAIN ////////////////////////////////////////////////[/COLOR]
     
     
    [COLOR="Blue"]mazegame.java class ////////////////////////////////////////////////////////////////////////[/COLOR]
     
    public class mazegame {
    	public static void main(String[] args) {
     
    		ReadFile();
    		GetInput();
    	}
     
     
     
    		public static void ReadFile()
    		{
    		TextIO.readFile("src/maze.txt");
     
    		boolean mazeGUI = true;
    		int x = TextIO.getInt();
    		int y = TextIO.getInt();
     
     
     
    			// Creating array of the map using the maze.txt file
    			int[][] map = new int[x][y];
    			for (int xCounter = 0; xCounter < x; xCounter++)
    				{
    					for (int yCounter = 0; yCounter < y; yCounter++)
    						{
    							map[xCounter][yCounter] = TextIO.getChar();
    						}
     
    					TextIO.getln();
    				}
     
    			TextIO.readStandardInput();
     
    			if (mazeGUI == true)
    			{
    				for (int xCounter = 0; xCounter < x; xCounter++)
    				{
    					for (int yCounter = 0; yCounter < y; yCounter++)
    						{
    						if (map[xCounter][yCounter] == '1')
    						{
    							TextIO.put('#');
    						}
    					    if (map[xCounter][yCounter] == '0')
    						{
    						    TextIO.put('.');
    						}
    						if (map[xCounter][yCounter] == '2')
    						{
    							TextIO.put('S');
    						}
    						if (map[xCounter][yCounter] == '3')
    						{
    							TextIO.put('X');
    						}				
    					}
    					TextIO.putln();
    					mazeGUI = false;
    			    }
    			}
    		}
    		private static void GetInput() {
     
    			char input = TextIO.getlnChar();
    			boolean exited = false;
     
    			TextIO.getlnChar();
     
    			 if(input == 'w')
                            {
    		        	//move up code
    		       	}
    			if(input == 's')
    			{
    				// move down code
    			}
    			if(input == 'a')
    			{
    				//move left code
    			}
    			if(input == 'd')
    			{
    				//move right code
    			}
    	//		if(position == exitlocation)
    	//		{
    	//			exited = true; // to show the exit has been reached and the game is over
    	//		}
     
    			if(exited == true)
    			{
    				TextIO.putln("SUCCESS!");
    			}
     
    	}
    }
     
     
    [COLOR="Blue"] END OF CLASS mazegame.java ///////////////////////////////////////////////////////[/COLOR]
     
     
     
    [COLOR="Blue"]START OF CLASS TextIO.java ////////////////////////////////////////////////////[/COLOR]
     
     
    import java.io.*;
    	import java.awt.*;
    	import java.awt.event.*;
    	import javax.swing.*;
     
    	import java.util.IllegalFormatException;
    	import java.util.regex.Matcher;
    	import java.util.regex.Pattern;
     
     
    	/**
    	 * TextIO provides a set of static methods for reading and writing text.  This version of TextIO
    	 * is an alternative to the basic version (which uses standard input and standard output for its
    	 * basic IO operations).  When this version is used, a window appears on the screen. This window
    	 * simulates standard IO when it is used by TextIO:  When TextIO writes to "standard output", the 
    	 * output actually goes to the window.  When TextIO reads from "standard input", the input actually
    	 * comes from input typed into the window by the user.  This is the default behavior, but it is
    	 * possible to redirect the IO to files or to other input and output streams.  When the (simulated)
    	 * standard input and output streams are being used, the input methods will not produce an error; 
    	 * instead, the user is repeatedly prompted for input until a legal input is entered.   For the most part,
    	 * any other error will be translated into an IllegalArguementException.  Note that when this version of
    	 * TextIO is used, calls to the output methods in TextIO are not equivalent to calls to methods in 
    	 * System.out; output to System.out still goes to the usual standard output.
    	 * <p>The window in which IO takes place remains open until it is closed by the user, even after
    	 * the program that used TextIO ends.
    	 * <p>This class does not use optimal Java programming practices.  It is designed specifically to be easily
    	 * usable even by a beginning programmer who has not yet learned about objects and exceptions.  Therefore, 
    	 * everything is in a single source file, all the methods are static methods, and none of the methods throw 
    	 * exceptions that would require try...catch statements.  Also for this reason, all exceptions are converted 
    	 * into IllegalArgumentExceptions, even when this exception type doesn't really make sense.
    	 * <p>When this version of TextIO is compiled, a rather large number of .class files are produced.  The
    	 * class files all have names beginning with "TextIO".  All of the class files are required for TextIO
    	 * to run successfully.
    	 * <p>This class requires Java 5.0 or higher. (A previous version of TextIO required only Java 1.1;
    	 * this version should work with any source code that used the previous version, but it has some new
    	 * features, including the type of formatted output that was introduced in Java 5 and the ability to
    	 * use files and streams.)
    	 */
    	public class TextIO {
     
    	   /* Modified November 2007 to empty the TextIO input buffer when switching from one
    	    * input source to another. This fixes a bug that allows input from the previous input
    	    * source to be read after the new source has been selected.
    	    */
     
    	   /**
    	    * The value returned by the peek() method when the input is at end-of-file.
    	    * (The value of this constant is (char)0xFFFF.)
    	    */
    	   public final static char EOF = (char)0xFFFF; 
     
    	   /**
    	    * The value returned by the peek() method when the input is at end-of-line.
    	    * The value of this constant is the character '\n'.
    	    */
    	   public final static char EOLN = '\n';          // The value returned by peek() when at end-of-line.
     
     
    	   /**
    	    * After this method is called, input will be read from standard input (as it 
    	    * is in the default state).  If a file or stream was previously the input source, that file
    	    * or stream is closed.
    	    */
    	   public static void readStandardInput() {
    	      if (readingStandardInput)
    	         return;
    	      try {
    	         in.close();
    	      }
    	      catch (Exception e) {
    	      }
    	      emptyBuffer();  // Added November 2007
    	      in = standardInput;
    	      inputFileName = null;
    	      readingStandardInput = true;
    	      inputErrorCount = 0;
    	   }
     
    	   /**
    	    * After this method is called, input will be read from inputStream, provided it
    	    * is non-null.  If inputStream is null, then this method has the same effect
    	    * as calling readStandardInput(); that is, future input will come from the
    	    * standard input stream.
    	    */
    	   public static void readStream(InputStream inputStream) {
    	      if (inputStream == null)
    	         readStandardInput();
    	      else
    	         readStream(new InputStreamReader(inputStream));
    	   }
     
    	   /**
    	    * After this method is called, input will be read from inputStream, provided it
    	    * is non-null.  If inputStream is null, then this method has the same effect
    	    * as calling readStandardInput(); that is, future input will come from the
    	    * standard input stream.
    	    */
    	   public static void readStream(Reader inputStream) {
    	      if (inputStream == null)
    	         readStandardInput();
    	      else {
    	         if ( inputStream instanceof BufferedReader)
    	            in = (BufferedReader)inputStream;
    	         else
    	            in = new BufferedReader(inputStream);
    	         emptyBuffer();  // Added November 2007
    	         inputFileName = null;
    	         readingStandardInput = false;
    	         inputErrorCount = 0;
    	      }
    	   }
     
    	   /**
    	    * Opens a file with a specified name for input.  If the file name is null, this has
    	    * the same effect as calling readStandardInput(); that is, input will be read from standard
    	    * input.  If an
    	    * error occurs while trying to open the file, an exception of type IllegalArgumentException
    	    * is thrown, and the input source is not changed.  If the file is opened 
    	    * successfully, then after this method is called, all of the input routines will read 
    	    * from the file, instead of from standard input.
    	    */
    	   public static void readFile(String fileName) {
    	      if (fileName == null) // Go back to reading standard input
    	         readStandardInput();
    	      else {
    	         BufferedReader newin;
    	         try {
    	            newin = new BufferedReader( new FileReader(fileName) );
    	         }
    	         catch (Exception e) {
    	            throw new IllegalArgumentException("Can't open file \"" + fileName + "\" for input.\n"
    	                           + "(Error :" + e + ")");
    	         }
    	         if (! readingStandardInput) { // close current input stream
    	            try {
    	               in.close();
    	            }
    	            catch (Exception e) {
    	            }
    	         }
    	         emptyBuffer();  // Added November 2007
    	         in = newin;
    	         readingStandardInput = false;
    	         inputErrorCount = 0;
    	         inputFileName = fileName;
    	      }
    	   }
     
    	   /**
    	    * Puts a GUI file-selection dialog box on the screen in which the user can select
    	    * an input file.  If the user cancels the dialog instead of selecting a file, it is
    	    * not considered an error, but the return value of the subroutine is false.
    	    * If the user does select a file, but there is an error while trying to open the
    	    * file, then an exception of type IllegalArgumentException is thrown.  Finally, if
    	    * the user selects a file and it is successfully opened, then the return value of the
    	    * subroutine is true, and  the input routines will read from the file, instead of 
    	    * from standard input.   If the user cancels, or if any error occurs, then the
    	    * previous input source is not changed.
    	    * <p>NOTE: Calling this method starts a GUI user interface thread, which can continue
    	    * to run even if the thread that runs the main program ends.  If you use this method
    	    * in a non-GUI program, it might be necessary to call System.exit(0) at the end of the main() 
    	    * routine to shut down the Java virtual machine completely.
    	    */
    	   public static boolean readUserSelectedFile() {
    	      if (fileDialog == null)
    	         fileDialog = new JFileChooser();
    	      fileDialog.setDialogTitle("Select File for Input");
    	      int option = fileDialog.showOpenDialog(console);
    	      if (option != JFileChooser.APPROVE_OPTION)
    	         return false;
    	      File selectedFile = fileDialog.getSelectedFile();
    	      BufferedReader newin;
    	      try {
    	         newin = new BufferedReader( new FileReader(selectedFile) );
    	      }
    	      catch (Exception e) {
    	         throw new IllegalArgumentException("Can't open file \"" + selectedFile.getName() + "\" for input.\n"
    	                        + "(Error :" + e + ")");
    	      }
    	      if (!readingStandardInput) { // close current file
    	         try {
    	            in.close();
    	         }
    	         catch (Exception e) {
    	         }
    	      }
    	      emptyBuffer();  // Added November 2007
    	      in = newin;
    	      inputFileName = selectedFile.getName();
    	      readingStandardInput = false;
    	      inputErrorCount = 0;
    	      return true;
    	   }
     
    	   /**
    	    * After this method is called, output will be written to standard output (as it 
    	    * is in the default state).  If a file or stream was previously open for output, it
    	    * will be closed.
    	    */
    	   public static void writeStandardOutput() {
    	      if (writingStandardOutput)
    	         return;
    	      try {
    	         out.close();
    	      }
    	      catch (Exception e) {
    	      }
    	      outputFileName = null;
    	      outputErrorCount = 0;
    	      out = standardOutput;
    	      writingStandardOutput = true;
    	   }
     
     
    	   /**
    	    * After this method is called, output will be sent to outputStream, provided it
    	    * is non-null.  If outputStream is null, then this method has the same effect
    	    * as calling writeStandardOutput(); that is, future output will be sent to the
    	    * standard output stream.
    	    */
    	   public static void writeStream(OutputStream outputStream) {
    	      if (outputStream == null)
    	         writeStandardOutput();
    	      else
    	         writeStream(new PrintWriter(outputStream));
    	   }
     
    	   /**
    	    * After this method is called, output will be sent to outputStream, provided it
    	    * is non-null.  If outputStream is null, then this method has the same effect
    	    * as calling writeStandardOutput(); that is, future output will be sent to the
    	    * standard output stream.
    	    */
    	   public static void writeStream(PrintWriter outputStream) {
    	      if (outputStream == null)
    	         writeStandardOutput();
    	      else {
    	         out = outputStream;
    	         outputFileName = null;
    	         outputErrorCount = 0;
    	         writingStandardOutput = false;
    	      }
    	   }
     
     
    	   /**
    	    * Opens a file with a specified name for output.  If the file name is null, this has
    	    * the same effect as calling writeStandardOutput(); that is, output will be sent to standard
    	    * output.  If an
    	    * error occurs while trying to open the file, an exception of type IllegalArgumentException
    	    * is thrown.  If the file is opened successfully, then after this method is called,
    	    * all of the output routines will write to the file, instead of to  standard output.
    	    * If an error occurs, the output destination is not changed.
    	    * <p>NOTE: Calling this method starts a GUI user interface thread, which can continue
    	    * to run even if the thread that runs the main program ends.  If you use this method
    	    * in a non-GUI program, it might be necessary to call System.exit(0) at the end of the main() 
    	    * routine to shut down the Java virtual machine completely.
    	    */
    	   public static void writeFile(String fileName) {
    	      if (fileName == null)  // Go back to reading standard output
    	         writeStandardOutput();
    	      else {
    	         PrintWriter newout;
    	         try {
    	            newout = new PrintWriter(new FileWriter(fileName));
    	         }
    	         catch (Exception e) {
    	            throw new IllegalArgumentException("Can't open file \"" + fileName + "\" for output.\n"
    	                           + "(Error :" + e + ")");
    	         }
    	         if (!writingStandardOutput) {
    	            try {
    	               out.close();
    	            }
    	            catch (Exception e) {
    	            }
    	         }
    	         out = newout;
    	         writingStandardOutput = false;
    	         outputFileName = fileName;
    	         outputErrorCount = 0;
    	      }
    	   }
     
    	   /**
    	    * Puts a GUI file-selection dialog box on the screen in which the user can select
    	    * an output file.  If the user cancels the dialog instead of selecting a file, it is
    	    * not considered an error, but the return value of the subroutine is false.
    	    * If the user does select a file, but there is an error while trying to open the
    	    * file, then an exception of type IllegalArgumentException is thrown.  Finally, if
    	    * the user selects a file and it is successfully opened, then the return value of the
    	    * subroutine is true, and  the output routines will write to the file, instead of 
    	    * to standard output.  If the user cancels, or if an error occurs, then the current
    	    * output destination is not changed.
    	    */
    	   public static boolean writeUserSelectedFile() {
    	      if (fileDialog == null)
    	         fileDialog = new JFileChooser();
    	      fileDialog.setDialogTitle("Select File for Output");
    	      File selectedFile;
    	      while (true) {
    	         int option = fileDialog.showSaveDialog(console);
    	         if (option != JFileChooser.APPROVE_OPTION)
    	            return false;  // user canceled
    	         selectedFile = fileDialog.getSelectedFile();
    	         if (selectedFile.exists()) {
    	            int response = JOptionPane.showConfirmDialog(console,
    	                  "The file \"" + selectedFile.getName() + "\" already exists.  Do you want to replace it?",
    	                  "Replace existing file?",
    	                  JOptionPane.YES_NO_OPTION, JOptionPane.WARNING_MESSAGE);
    	            if (response == JOptionPane.YES_OPTION)
    	               break;
    	         }
    	         else {
    	            break;
    	         }
    	      }
    	      PrintWriter newout;
    	      try {
    	         newout = new PrintWriter(new FileWriter(selectedFile));
    	      }
    	      catch (Exception e) {
    	         throw new IllegalArgumentException("Can't open file \"" + selectedFile.getName() + "\" for output.\n"
    	                        + "(Error :" + e + ")");
    	      }
    	      if (!writingStandardOutput) {
    	         try {
    	            out.close();
    	         }
    	         catch (Exception e) {
    	         }
    	      }
    	      out = newout;
    	      writingStandardOutput = false;
    	      outputFileName = selectedFile.getName();
    	      outputErrorCount = 0;
    	      return true;
    	   }
     
     
    	   /**
    	    * If TextIO is currently reading from a file, then the return value is the name of the file.  
    	    * If the class is reading from standard input or from a stream, then the return value is null.
    	    */
    	   public static String getInputFileName() {
    	      return inputFileName;
    	   }
     
     
    	   /**
    	    * If TextIO is currently writing to a file, then the return value is the name of the file.  
    	    * If the class is writing to standard output or to a stream, then the return value is null.
    	    */
    	   public static String getOutputFileName() {
    	      return outputFileName;
    	   }
     
     
    	   // *************************** Output Methods *********************************
     
    	   /**
    	    * Write a single value to the current output destination, using the default format
    	    * and no extra spaces.  This method will handle any type of parameter, even one
    	    * whose type is one of the primitive types.
    	    */
    	   public static void put(Object x) { 
    	      out.print(x); 
    	      out.flush();
    	      if (out.checkError())
    	         outputError("Error while writing output.");
    	   }
     
    	   /**
    	    * Write a single value to the current output destination, using the default format
    	    * and outputting at least minChars characters (with extra spaces added before the
    	    * output value if necessary).  This method will handle any type of parameter, even one
    	    * whose type is one of the primitive types.
    	    * @param x The value to be output, which can be of any type.
    	    * @param minChars The minimum number of characters to use for the output.  If x requires fewer
    	    * then this number of characters, then extra spaces are added to the front of x to bring
    	    * the total up to minChars.  If minChars is less than or equal to zero, then x will be printed
    	    * in the minumum number of spaces possible.
    	    */
    	   public static void put(Object x, int minChars)  { 
    	      if (minChars <= 0)
    	         out.print(x);
    	      else {
    	         out.printf("%" + minChars + "s", x);
    	         out.flush();
    	      }
    	      if (out.checkError())
    	         outputError("Error while writing output.");
    	   }
     
    	   /**
    	    * This is equivalent to put(x), followed by an end-of-line.
    	    */
    	   public static void putln(Object x) { 
    	      out.println(x);
    	      out.flush();
    	      if (out.checkError())
    	         outputError("Error while writing output.");
    	   }
     
    	   /**
    	    * This is equivalent to put(x,minChars), followed by an end-of-line.
    	    */
    	   public static void putln(Object x, int minChars) {
    	      put(x,minChars);
    	      out.println();
    	      out.flush();
    	      if (out.checkError())
    	         outputError("Error while writing output.");
    	   }
     
    	   /**
    	    * Write an end-of-line character to the current output destination.
    	    */
    	   public static void putln() {
    	      out.println();
    	      out.flush();
    	      if (out.checkError())
    	         outputError("Error while writing output.");
    	   }
     
    	   /**
    	    * Writes formatted output values to the current output destination.  This method has the
    	    * same function as System.out.printf(); the details of formatted output are not discussed
    	    * here.  The first parameter is a string that describes the format of the output.  There
    	    * can be any number of additional parameters; these specify the values to be output and
    	    * can be of any type.  This method will throw an IllegalArgumentException if the
    	    * format string is null or if the format string is illegal for the values that are being
    	    * output.
    	    */
    	   public static void putf(String format, Object... items) {
    	      if (format == null)
    	         throw new IllegalArgumentException("Null format string in TextIO.putf() method.");
    	      try {
    	         out.printf(format,items);
    	      }
    	      catch (IllegalFormatException e) {
    	         throw new IllegalArgumentException("Illegal format string in TextIO.putf() method.");
    	      }
    	      out.flush();
    	      if (out.checkError())
    	         outputError("Error while writing output.");
    	   }
     
    	   // *************************** Input Methods *********************************
     
    	   /**
    	    * Test whether the next character in the current input source is an end-of-line.  Note that
    	    * this method does NOT skip whitespace before testing for end-of-line -- if you want to do
    	    * that, call skipBlanks() first.
    	    */
    	   public static boolean eoln() { 
    	      return peek() == '\n'; 
    	   }
     
    	   /**
    	    * Test whether the next character in the current input source is an end-of-file.  Note that
    	    * this method does NOT skip whitespace before testing for end-of-line -- if you want to do
    	    * that, call skipBlanks() or skipWhitespace() first.
    	    */
    	   public static boolean eof()  { 
    	      return peek() == EOF; 
    	   }
     
    	   /**
    	    * Reads the next character from the current input source.  The character can be a whitespace
    	    * character; compare this to the getChar() method, which skips over whitespace and returns the
    	    * next non-whitespace character.  An end-of-line is always returned as the character '\n', even
    	    * when the actual end-of-line in the input source is something else, such as '\r' or "\r\n".
    	    * This method will throw an IllegalArgumentException if the input is at end-of-file (which will 
    	    * not ordinarily happen if reading from standard input).
    	    */
    	   public static char getAnyChar() { 
    	      return readChar(); 
    	   }
     
    	   /**
    	    * Returns the next character in the current input source, without actually removing that
    	    * character from the input.  The character can be a whitespace character and can be the
    	    * end-of-file character (specfied by the constant TextIO.EOF).An end-of-line is always returned 
    	    * as the character '\n', even when the actual end-of-line in the input source is something else, 
    	    * such as '\r' or "\r\n".  This method never causes an error.
    	    */
    	   public static char peek() { 
    	      return lookChar();
    	   }
     
    	   /**
    	    * Skips over any whitespace characters, except for end-of-lines.  After this method is called,
    	    * the next input character is either an end-of-line, an end-of-file, or a non-whitespace character.
    	    * This method never causes an error.  (Ordinarly, end-of-file is not possible when reading from
    	    * standard input.)
    	    */
    	   public static void skipBlanks() { 
    	      char ch=lookChar();
    	      while (ch != EOF && ch != '\n' && Character.isWhitespace(ch)) {
    	         readChar();
    	         ch = lookChar();
    	      }
    	   }
     
    	   /**
    	    * Skips over any whitespace characters, including for end-of-lines.  After this method is called,
    	    * the next input character is either an end-of-file or a non-whitespace character.
    	    * This method never causes an error. (Ordinarly, end-of-file is not possible when reading from
    	    * standard input.)
    	    */
    	   private static void skipWhitespace() {
    	      char ch=lookChar();
    	      while (ch != EOF && Character.isWhitespace(ch)) {
    	         readChar();
    	         if (ch == '\n' && readingStandardInput && writingStandardOutput) {
    	            out.print("? ");
    	            out.flush();
    	         }
    	         ch = lookChar();
    	      }
    	   }
     
    	   /**
    	    * Skips whitespace characters and then reads a value of type byte from input, discarding the rest of 
    	    * the current line of input (including the next end-of-line character, if any).  When using standard IO,
    	    * this will not produce an error; the user will be prompted repeatedly for input until a legal value
    	    * is input.  In other cases, an IllegalArgumentException will be thrown if a legal value is not found.
    	    */
    	   public static byte getlnByte() { 
    	      byte x=getByte(); 
    	      emptyBuffer(); 
    	      return x; 
    	   }
     
    	   /**
    	    * Skips whitespace characters and then reads a value of type short from input, discarding the rest of 
    	    * the current line of input (including the next end-of-line character, if any).  When using standard IO,
    	    * this will not produce an error; the user will be prompted repeatedly for input until a legal value
    	    * is input.  In other cases, an IllegalArgumentException will be thrown if a legal value is not found.
    	    */
    	   public static short getlnShort() {
    	      short x=getShort();
    	      emptyBuffer(); 
    	      return x; 
    	   }
     
    	   /**
    	    * Skips whitespace characters and then reads a value of type int from input, discarding the rest of 
    	    * the current line of input (including the next end-of-line character, if any).  When using standard IO,
    	    * this will not produce an error; the user will be prompted repeatedly for input until a legal value
    	    * is input.  In other cases, an IllegalArgumentException will be thrown if a legal value is not found.
    	    */
    	   public static int getlnInt() { 
    	      int x=getInt(); 
    	      emptyBuffer(); 
    	      return x; 
    	   }
     
    	   /**
    	    * Skips whitespace characters and then reads a value of type long from input, discarding the rest of 
    	    * the current line of input (including the next end-of-line character, if any).  When using standard IO,
    	    * this will not produce an error; the user will be prompted repeatedly for input until a legal value
    	    * is input.  In other cases, an IllegalArgumentException will be thrown if a legal value is not found.
    	    */
    	   public static long getlnLong() {
    	      long x=getLong(); 
    	      emptyBuffer(); 
    	      return x;
    	   }
     
    	   /**
    	    * Skips whitespace characters and then reads a value of type float from input, discarding the rest of 
    	    * the current line of input (including the next end-of-line character, if any).  When using standard IO,
    	    * this will not produce an error; the user will be prompted repeatedly for input until a legal value
    	    * is input.  In other cases, an IllegalArgumentException will be thrown if a legal value is not found.
    	    */
    	   public static float getlnFloat() {
    	      float x=getFloat(); 
    	      emptyBuffer(); 
    	      return x;
    	   }
     
    	   /**
    	    * Skips whitespace characters and then reads a value of type double from input, discarding the rest of 
    	    * the current line of input (including the next end-of-line character, if any).  When using standard IO,
    	    * this will not produce an error; the user will be prompted repeatedly for input until a legal value
    	    * is input.  In other cases, an IllegalArgumentException will be thrown if a legal value is not found.
    	    */
    	   public static double getlnDouble() { 
    	      double x=getDouble(); 
    	      emptyBuffer(); 
    	      return x; 
    	   }
     
    	   /**
    	    * Skips whitespace characters and then reads a value of type char from input, discarding the rest of 
    	    * the current line of input (including the next end-of-line character, if any).  Note that the value
    	    * that is returned will be a non-whitespace character; compare this with the getAnyChar() method.
    	    * When using standard IO, this will not produce an error.  In other cases, an error can occur if
    	    * an end-of-file is encountered.
    	    */
    	   public static char getlnChar() {
    	      char x=getChar(); 
    	      emptyBuffer(); 
    	      return x;
    	   }
     
    	   /**
    	    * Skips whitespace characters and then reads a value of type boolean from input, discarding the rest of 
    	    * the current line of input (including the next end-of-line character, if any).  When using standard IO,
    	    * this will not produce an error; the user will be prompted repeatedly for input until a legal value
    	    * is input.  In other cases, an IllegalArgumentException will be thrown if a legal value is not found.
    	    * <p>Legal inputs for a boolean input are: true, t, yes, y, 1, false, f, no, n, and 0; letters can be
    	    * either upper case or lower case. One "word" of input is read, using the getWord() method, and it
    	    * must be one of these; note that the "word"  must be terminated by a whitespace character (or end-of-file).
    	    */
    	   public static boolean getlnBoolean() { 
    	      boolean x=getBoolean(); 
    	      emptyBuffer();
    	      return x; 
    	   }
     
    	   /**
    	    * Skips whitespace characters and then reads one "word" from input, discarding the rest of 
    	    * the current line of input (including the next end-of-line character, if any).  A word is defined as
    	    * a sequence of non-whitespace characters (not just letters!).   When using standard IO,
    	    * this will not produce an error.  In other cases, an IllegalArgumentException will be thrown
    	    * if an end-of-file is encountered.
    	    */
    	   public static String getlnWord() {
    	      String x=getWord(); 
    	      emptyBuffer(); 
    	      return x; 
    	   }
     
    	   /**
    	    * This is identical to getln().
    	    */
    	   public static String getlnString() {
    	      return getln();
    	   } 
     
    	   /**
    	    * Reads all the charcters from the current input source, up to the next end-of-line.  The end-of-line
    	    * is read but is not included in the return value.  Any other whitespace characters on the line are retained,
    	    * even if they occur at the start of input.  The return value will be an empty string if there are no
    	    * no characters before the end-of-line.  When using standard IO, this will not produce an error.  
    	    * In other cases, an IllegalArgumentException will be thrown if an end-of-file is encountered.
    	    */
    	   public static String getln() {
    	      StringBuffer s = new StringBuffer(100);
    	      char ch = readChar();
    	      while (ch != '\n') {
    	         s.append(ch);
    	         ch = readChar();
    	      }
    	      return s.toString();
    	   }
     
    	   /**
    	    * Skips whitespace characters and then reads a value of type byte from input.  Any additional characters on
    	    * the current line of input are retained, and will be read by the next input operation.  When using standard IO,
    	    * this will not produce an error; the user will be prompted repeatedly for input until a legal value
    	    * is input.  In other cases, an IllegalArgumentException will be thrown if a legal value is not found.
    	    */
    	   public static byte getByte()   { 
    	      return (byte)readInteger(-128L,127L); 
    	   }
     
    	   /**
    	    * Skips whitespace characters and then reads a value of type short from input.  Any additional characters on
    	    * the current line of input are retained, and will be read by the next input operation.  When using standard IO,
    	    * this will not produce an error; the user will be prompted repeatedly for input until a legal value
    	    * is input.  In other cases, an IllegalArgumentException will be thrown if a legal value is not found.
    	    */
    	   public static short getShort() { 
    	      return (short)readInteger(-32768L,32767L);
    	   }   
     
    	   /**
    	    * Skips whitespace characters and then reads a value of type int from input.  Any additional characters on
    	    * the current line of input are retained, and will be read by the next input operation.  When using standard IO,
    	    * this will not produce an error; the user will be prompted repeatedly for input until a legal value
    	    * is input.  In other cases, an IllegalArgumentException will be thrown if a legal value is not found.
    	    */
    	   public static int getInt()     { 
    	      return (int)readInteger((long)Integer.MIN_VALUE, (long)Integer.MAX_VALUE);
    	   }
     
    	   /**
    	    * Skips whitespace characters and then reads a value of type long from input.  Any additional characters on
    	    * the current line of input are retained, and will be read by the next input operation.  When using standard IO,
    	    * this will not produce an error; the user will be prompted repeatedly for input until a legal value
    	    * is input.  In other cases, an IllegalArgumentException will be thrown if a legal value is not found.
    	    */
    	   public static long getLong()   { 
    	      return readInteger(Long.MIN_VALUE, Long.MAX_VALUE); 
    	   }
     
    	   /**
    	    * Skips whitespace characters and then reads a single non-whitespace character from input.  Any additional characters on
    	    * the current line of input are retained, and will be read by the next input operation.  When using standard IO,
    	    * this will not produce an error.  In other cases, an IllegalArgumentException will be thrown if an end-of-file
    	    * is encountered.
    	    */
    	   public static char getChar() { 
    	      skipWhitespace();
    	      return readChar();
    	   }
     
    	   /**
    	    * Skips whitespace characters and then reads a value of type float from input.  Any additional characters on
    	    * the current line of input are retained, and will be read by the next input operation.  When using standard IO,
    	    * this will not produce an error; the user will be prompted repeatedly for input until a legal value
    	    * is input.  In other cases, an IllegalArgumentException will be thrown if a legal value is not found.
    	    */
    	   public static float getFloat() {
    	      float x = 0.0F;
    	      while (true) {
    	         String str = readRealString();
    	         if (str == null) {
    	            errorMessage("Floating point number not found.",
    	                  "Real number in the range " + (-Float.MAX_VALUE) + " to " + Float.MAX_VALUE);
    	         }
    	         else {
    	            try { 
    	               x = Float.parseFloat(str); 
    	            }
    	            catch (NumberFormatException e) {
    	               errorMessage("Illegal floating point input, " + str + ".",
    	                     "Real number in the range " + (-Float.MAX_VALUE) + " to " + Float.MAX_VALUE);
    	               continue;
    	            }
    	            if (Float.isInfinite(x)) {
    	               errorMessage("Floating point input outside of legal range, " + str + ".",
    	                     "Real number in the range " + (-Float.MAX_VALUE) + " to " + Float.MAX_VALUE);
    	               continue;
    	            }
    	            break;
    	         }
    	      }
    	      inputErrorCount = 0;
    	      return x;
    	   }
     
    	   /**
    	    * Skips whitespace characters and then reads a value of type double from input.  Any additional characters on
    	    * the current line of input are retained, and will be read by the next input operation.  When using standard IO,
    	    * this will not produce an error; the user will be prompted repeatedly for input until a legal value
    	    * is input.  In other cases, an IllegalArgumentException will be thrown if a legal value is not found.
    	    */
    	   public static double getDouble() {
    	      double x = 0.0;
    	      while (true) {
    	         String str = readRealString();
    	         if (str == null) {
    	            errorMessage("Floating point number not found.",
    	                  "Real number in the range " + (-Double.MAX_VALUE) + " to " + Double.MAX_VALUE);
    	         }
    	         else {
    	            try { 
    	               x = Double.parseDouble(str); 
    	            }
    	            catch (NumberFormatException e) {
    	               errorMessage("Illegal floating point input, " + str + ".",
    	                     "Real number in the range " + (-Double.MAX_VALUE) + " to " + Double.MAX_VALUE);
    	               continue;
    	            }
    	            if (Double.isInfinite(x)) {
    	               errorMessage("Floating point input outside of legal range, " + str + ".",
    	                     "Real number in the range " + (-Double.MAX_VALUE) + " to " + Double.MAX_VALUE);
    	               continue;
    	            }
    	            break;
    	         }
    	      }
    	      inputErrorCount = 0;
    	      return x;
    	   }
     
    	   /**
    	    * Skips whitespace characters and then reads one "word" from input. Any additional characters on
    	    * the current line of input are retained, and will be read by the next input operation.  A word is defined as
    	    * a sequence of non-whitespace characters (not just letters!).   When using standard IO,
    	    * this will not produce an error.  In other cases, an IllegalArgumentException will be thrown
    	    * if an end-of-file is encountered.
    	    */
    	   public static String getWord() {
    	      skipWhitespace();
    	      StringBuffer str = new StringBuffer(50);
    	      char ch = lookChar();
    	      while (ch == EOF || !Character.isWhitespace(ch)) {
    	         str.append(readChar());
    	         ch = lookChar();
    	      }
    	      return str.toString();
    	   }
     
    	   /**
    	    * Skips whitespace characters and then reads a value of type boolean from input.  Any additional characters on
    	    * the current line of input are retained, and will be read by the next input operation.  When using standard IO,
    	    * this will not produce an error; the user will be prompted repeatedly for input until a legal value
    	    * is input.  In other cases, an IllegalArgumentException will be thrown if a legal value is not found.
    	    * <p>Legal inputs for a boolean input are: true, t, yes, y, 1, false, f, no, n, and 0; letters can be
    	    * either upper case or lower case. One "word" of input is read, using the getWord() method, and it
    	    * must be one of these; note that the "word"  must be terminated by a whitespace character (or end-of-file).
    	    */
    	   public static boolean getBoolean() {
    	      boolean ans = false;
    	      while (true) {
    	         String s = getWord();
    	         if ( s.equalsIgnoreCase("true") || s.equalsIgnoreCase("t") ||
    	               s.equalsIgnoreCase("yes")  || s.equalsIgnoreCase("y") ||
    	               s.equals("1") ) {
    	            ans = true;
    	            break;
    	         }
    	         else if ( s.equalsIgnoreCase("false") || s.equalsIgnoreCase("f") ||
    	               s.equalsIgnoreCase("no")  || s.equalsIgnoreCase("n") ||
    	               s.equals("0") ) {
    	            ans = false;
    	            break;
    	         }
    	         else
    	            errorMessage("Illegal boolean input value.",
    	            "one of:  true, false, t, f, yes, no, y, n, 0, or 1");
    	      }
    	      inputErrorCount = 0;
    	      return ans;
    	   }
     
    	   // ***************** Everything beyond this point is private implementation detail *******************
     
    	   private static String inputFileName;  // Name of file that is the current input source, or null if the source is not a file.
    	   private static String outputFileName; // Name of file that is the current output destination, or null if the destination is not a file.
     
    	   private static JFileChooser fileDialog; // Dialog used by readUserSelectedFile() and writeUserSelectedFile()
     
    	   private final static BufferedReader standardInput;  // wraps the input stream from Console. (Set in static initializer.)
    	   private final static PrintWriter standardOutput;  // wraps the output stream. (Set in static initializer.)
     
    	   private static BufferedReader in;  // Stream that data is read from; the current input source. (Set in static initializer.)
    	   private static PrintWriter out;   // Stream that data is written to; the current output destination. (Set in static initializer.)
     
    	   private static boolean readingStandardInput = true;
    	   private static boolean writingStandardOutput = true;
     
    	   private static int inputErrorCount;  // Number of consecutive errors on standard input; reset to 0 when a successful read occurs.
    	   private static int outputErrorCount;  // Number of errors on standard output since it was selected as the output destination.
     
    	   private static Matcher integerMatcher;  // Used for reading integer numbers; created from the integer Regex Pattern.
    	   private static Matcher floatMatcher;   // Used for reading floating point numbers; created from the floatRegex Pattern.
    	   private final static Pattern integerRegex = Pattern.compile("(\\+|-)?[0-9]+");
    	   private final static Pattern floatRegex = Pattern.compile("(\\+|-)?(([0-9]+(\\.[0-9]*)?)|(\\.[0-9]+))((e|E)(\\+|-)?[0-9]+)?");
     
    	   private static String buffer = null;  // One line read from input.
    	   private static int pos = 0;           // Position of next char in input line that has not yet been processed.
     
    	   private static Console console;  // The GUI IO widget used for simulated input/output.
     
    	   private static String readRealString() {   // read chars from input following syntax of real numbers
    	      skipWhitespace();
    	      if (lookChar() == EOF)
    	         return null;
    	      if (floatMatcher == null)
    	         floatMatcher = floatRegex.matcher(buffer);
    	      floatMatcher.region(pos,buffer.length());
    	      if (floatMatcher.lookingAt()) {
    	         String str = floatMatcher.group();
    	         pos = floatMatcher.end();
    	         return str;
    	      }
    	      else 
    	         return null;
    	   }
     
    	   private static String readIntegerString() {  // read chars from input following syntax of integers
    	      skipWhitespace();
    	      if (lookChar() == EOF)
    	         return null;
    	      if (integerMatcher == null)
    	         integerMatcher = integerRegex.matcher(buffer);
    	      integerMatcher.region(pos,buffer.length());
    	      if (integerMatcher.lookingAt()) {
    	         String str = integerMatcher.group();
    	         pos = integerMatcher.end();
    	         return str;
    	      }
    	      else 
    	         return null;
    	   }
     
    	   private static long readInteger(long min, long max) {  // read long integer, limited to specified range
    	      long x=0;
    	      while (true) {
    	         String s = readIntegerString();
    	         if (s == null){
    	            errorMessage("Integer value not found in input.",
    	                  "Integer in the range " + min + " to " + max);
    	         }
    	         else {
    	            String str = s.toString();
    	            try { 
    	               x = Long.parseLong(str);
    	            }
    	            catch (NumberFormatException e) {
    	               errorMessage("Illegal integer input, " + str + ".",
    	                     "Integer in the range " + min + " to " + max);
    	               continue;
    	            }
    	            if (x < min || x > max) {
    	               errorMessage("Integer input outside of legal range, " + str + ".",
    	                     "Integer in the range " + min + " to " + max);
    	               continue;
    	            }
    	            break;
    	         }
    	      }
    	      inputErrorCount = 0;
    	      return x;
    	   }
     
     
    	   private static void errorMessage(String message, String expecting) {  // Report error on input.
    	      console.clearTypeAhead();
    	      if (readingStandardInput && writingStandardOutput) {
    	             // inform user of error and force user to re-enter.
    	         out.println();
    	         out.print("  *** Error in input: " + message + "\n");
    	         out.print("  *** Expecting: " + expecting + "\n");
    	         out.print("  *** Discarding Input: ");
    	         if (lookChar() == '\n')
    	            out.print("(end-of-line)\n\n");
    	         else {
    	            while (lookChar() != '\n')    // Discard and echo remaining chars on the current line of input.
    	               out.print(readChar());
    	            out.print("\n\n");
    	         }
    	         out.print("Please re-enter: ");
    	         out.flush();
    	         readChar();  // discard the end-of-line character
    	         inputErrorCount++;
    	         if (inputErrorCount >= 10)
    	            throw new IllegalArgumentException("Too many input consecutive input errors on standard input.");
    	      }
    	      else if (inputFileName != null)
    	         throw new IllegalArgumentException("Error while reading from file \"" + inputFileName + "\":\n" 
    	               + message + "\nExpecting " + expecting);
    	      else
    	         throw new IllegalArgumentException("Error while reading from input stream:\n" 
    	               + message + "\nExpecting " + expecting);
    	   }
     
    	   private static char lookChar() {  // return next character from input
    	      if (buffer == null || pos > buffer.length())
    	         fillBuffer();
    	      if (buffer == null)
    	         return EOF;
    	      else if (pos == buffer.length())
    	         return '\n';
    	      else 
    	         return buffer.charAt(pos);
    	   }
     
    	   private static char readChar() {  // return and discard next character from input
    	      char ch = lookChar();
    	      if (buffer == null) {
    	         if (readingStandardInput)
    	            throw new IllegalArgumentException("Attempt to read past end-of-file in standard input???");
    	         else
    	            throw new IllegalArgumentException("Attempt to read past end-of-file in file \"" + inputFileName + "\".");
    	      }
    	      pos++;
    	      return ch;
    	   }
     
    	   private static void fillBuffer() {    // Wait for user to type a line and press return,
    	      try {
    	         buffer = in.readLine();
    	      }
    	      catch (Exception e) {
    	         if (readingStandardInput)
    	            throw new IllegalArgumentException("Error while reading standard input???");
    	         else if (inputFileName != null)
    	            throw new IllegalArgumentException("Error while attempting to read from file \"" + inputFileName + "\".");
    	         else
    	            throw new IllegalArgumentException("Errow while attempting to read form an input stream.");
    	      }
    	      pos = 0;
    	      floatMatcher = null;
    	      integerMatcher = null;
    	   }
     
    	   private static void emptyBuffer() {   // discard the rest of the current line of input
    	      buffer = null;
    	   }
     
    	   private static void outputError(String message) {  // Report an error on output.
    	      if (writingStandardOutput) {
    	         System.err.println("Error occurred in TextIO while writing to standard output!!");
    	         outputErrorCount++;
    	         if (outputErrorCount >= 10) {
    	            outputErrorCount = 0;
    	            throw new IllegalArgumentException("Too many errors while writing to standard output.");
    	         }
    	      }
    	      else if (outputFileName != null){
    	         throw new IllegalArgumentException("Error occurred while writing to file \"" 
    	               + outputFileName+ "\":\n   " + message);
    	      }
    	      else {
    	         throw new IllegalArgumentException("Error occurred while writing to output stream:\n   " + message);
    	      }
    	   }
     
    	   // ******************************* Defining the GUI ***************************************
     
    	   /**
    	    * A "Console" is a panel which simulates standard input/output.  When this GUI TextIO class is used,
    	    * a frame will be opened that displays a Console.  When the output destination for TextIO is standard
    	    * output, the output will appear in the window.  When TextIO wants to fill its buffer with a line of input
    	    * from standard input, the user will type a line of input in the Console, which will go into the buffer.
    	    * There is also a scroll bar that can be used to browse lines that have scorlled off the top (up to 2000 lines).
    	    */
    	   private static class Console extends JPanel {
    	      /**
    		 * 
    		 */
    		private static final long serialVersionUID = 1L;
    		JScrollBar scroller;
    	      BufferedReader inputStream;
    	      PrintWriter outputStream;
    	      String[] lines;
    	      int topLine;
    	      int lineCount;
    	      int rows, columns;
    	      volatile boolean doingInput;
    	      volatile String inputBuffer;
    	      volatile boolean cursorOn = true;
    	      volatile int inputStartLine, inputStartColumn;
    	      volatile String typeAheadBuffer = "";
    	      FontMetrics fontMetrics;
    	      int lineSkip;
    	      int charWidth;
    	      final static int MARGIN = 6;
    	      final static Color CURSOR_COLOR = new Color(200,0,0);
     
    	      Console() {
    	         int screenResolution = Toolkit.getDefaultToolkit().getScreenResolution();
    	         Font f = getFont();
    	         int points = f.getSize(); 
    	         int newpoints = Math.max(points, (int)(0.5 + screenResolution / 6)); 
    	         f = new Font("Monospaced", Font.PLAIN, newpoints);
    	         fontMetrics = getFontMetrics(f);
    	         if (points != newpoints && fontMetrics.getHeight() * 1.2 * 5 > screenResolution) {
    	            f = new Font("Monospaced", Font.PLAIN, points); 
    	            fontMetrics = getFontMetrics(f);
    	         }
    	         lineSkip = (int)(fontMetrics.getHeight() * 1.2);  
    	         charWidth = fontMetrics.charWidth('W');
    	         setFont(f);
    	         setPreferredSize(new Dimension(2*MARGIN + 80*charWidth, 2*MARGIN + (25-1)*lineSkip + fontMetrics.getAscent() + fontMetrics.getDescent()));
    	         setBackground(Color.WHITE);
    	         setForeground(Color.BLACK);
    	         setBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY, 3));
    	         addFocusListener( new FocusListener() {
    	            public void focusLost(FocusEvent evt) {
    	               setBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY,3));
    	            }
    	            public void focusGained(FocusEvent evt) {
    	               setBorder(BorderFactory.createLineBorder(Color.CYAN,3));
    	            }
    	         } );
    	         addMouseListener( new MouseAdapter() {
    	            public void mousePressed(MouseEvent evt) {
    	               requestFocus();
    	            }
    	         } );
    	         addKeyListener( new KeyAdapter() {
    	            public void keyTyped(KeyEvent evt) {
    	               char ch = evt.getKeyChar();
    	               if (ch == KeyEvent.CHAR_UNDEFINED)
    	                  return;
    	               if (!doingInput) {
    	                  typeAheadBuffer += ch;
    	                  return;
    	               }
    	               synchronized(Console.this) {
    	                  doInputChar(ch);
    	                  Console.this.notify();
    	               }
    	            }
    	         } );
    	         lines = new String[2000];
    	         lineCount = 1;
    	         lines[0] = "";
    	         scroller = new JScrollBar(JScrollBar.VERTICAL,0,80,0,80);
    	         scroller.setEnabled(false);
    	         scroller.addAdjustmentListener( new AdjustmentListener() { 
    	            public void adjustmentValueChanged(AdjustmentEvent evt) {
    	               topLine = scroller.getValue();
    	               repaint();
    	            }
    	         });
    	         inputStream = new BufferedReader(new CIN());
    	         outputStream = new PrintWriter(new COUT());
    	      }
     
    	      public void paintComponent(Graphics g) {
    	         super.paintComponent(g);
    	         if (rows == 0) {
    	            columns = (getWidth() - 2*MARGIN + 1) / charWidth;
    	            rows = 1 + (getHeight() - 2*MARGIN - fontMetrics.getAscent()) / lineSkip;
    	            scroller.setBlockIncrement(rows - 2);
    	            scrollToEnd();
    	         }
    	         for (int i = topLine; i < topLine + rows && i < lineCount; i++)
    	            g.drawString(lines[i],MARGIN,MARGIN+(i-topLine)*lineSkip + fontMetrics.getAscent());
    	         if (doingInput && cursorOn) {
    	            g.setColor(CURSOR_COLOR);
    	            int x = MARGIN + fontMetrics.stringWidth(lines[lineCount-1])+1;
    	            int y1 = MARGIN + (lineCount-1-topLine)*lineSkip + fontMetrics.getAscent() + fontMetrics.getDescent();
    	            int y2 = y1 - fontMetrics.getAscent() - fontMetrics.getDescent();
    	            g.drawLine(x,y1,x,y2);
    	            g.drawLine(x+1,y1,x+1,y2);
    	         }
    	      }
     
    	      synchronized void newLine() {
    	         try {
    	            Thread.sleep(20);
    	         }
    	         catch (InterruptedException e) {
    	         }
    	         if (lineCount == lines.length) {
    	            for (int i = 0; i < lines.length-1; i++)
    	               lines[i] = lines[i+1];
    	            lines[lines.length-1] = ""; 
    	            if (doingInput)
    	               inputStartLine--;
    	         }
    	         else {
    	            lines[lineCount] = "";
    	            lineCount++;
    	         }
    	         scrollToEnd();
    	         repaint();
    	      }
     
    	      synchronized void putChar(char ch) {
    	         if (ch == '\n') {
    	            newLine();
    	            return;
    	         }
    	         if (ch == '\t')
    	            ch = ' ';
    	         if (!Character.isDefined(ch) || Character.isISOControl(ch))
    	            return;
    	         if (columns > 0 && lines[lineCount-1].length() >= columns)
    	            newLine();
    	         lines[lineCount-1] += ch;
    	      }
     
    	      synchronized void deleteChar() {
    	         if (lineCount == 0)
    	            return;
    	         if (inputStartLine == lineCount-1 && inputStartColumn >= lines[lineCount-1].length())
    	            return;
    	         if (lines[lineCount-1].length() > 0)
    	            lines[lineCount-1] = lines[lineCount-1].substring(0,lines[lineCount-1].length()-1);
    	         else {
    	            lineCount--;
    	            scrollToEnd();
    	         }
    	      }
     
    	      void scrollToEnd() {
    	         if (rows == 0)
    	            return;
    	         if (lineCount <= rows) {
    	            topLine = 0;
    	            scroller.setEnabled(false);
    	         }
    	         else {
    	            topLine = lineCount - rows;
    	            scroller.setEnabled(true);
    	         }
    	         scroller.setValues(topLine,rows,0,rows+topLine);
    	      }
     
    	      synchronized void doInputChar(char ch) {
    	         if (ch == 8 || ch == 127) {
    	            deleteChar();
    	            if (inputBuffer.length() >  0)
    	               inputBuffer = inputBuffer.substring(0,inputBuffer.length()-1);
    	         }
    	         else if (ch == 13 || ch == 10) {
    	            newLine();
    	            doingInput = false;
    	         }
    	         else {
    	            putChar(ch);
    	            if (ch == '\t')
    	               ch = ' ';
    	            if (Character.isDefined(ch) && ! Character.isISOControl(ch))
    	               inputBuffer += ch;
    	         }
    	         scrollToEnd();
    	         repaint();
    	      }
     
    	      synchronized void clearTypeAhead() {
    	         typeAheadBuffer = "";
    	      }
     
    	      class CIN extends Reader {  // "Standard input" is replaced in TextIO with an object of this type.
    	         String buffer;
    	         int pos;
    	         public void close() {
    	         }
    	         public int read(char[] b, int offset, int length) throws IOException {
    	            int ct = 0;
    	            int ch;
    	            do {
    	               ch = read();
    	               b[offset + ct] = (char)ch;
    	               ct++;
    	            } while (ch != 10);
    	            return ct;
    	         }
    	         public int read() {
    	            if (buffer != null && pos < buffer.length()) {
    	               pos++;
    	               return buffer.charAt(pos-1);
    	            }
    	            synchronized(Console.this) {
    	               inputStartLine = lineCount - 1;
    	               inputStartColumn = lines[lineCount-1].length();
    	               char ch = 0;
    	               scrollToEnd();
    	               inputBuffer = "";
    	               while (typeAheadBuffer.length() > 0) {
    	                  ch = typeAheadBuffer.charAt(0);
    	                  typeAheadBuffer = typeAheadBuffer.substring(1);
    	                  if (ch == 13 || ch == 10)
    	                     break;
    	                  doInputChar(ch);
    	                  repaint();
    	                  try {
    	                     Console.this.wait(25);
    	                  }
    	                  catch (InterruptedException e) {
    	                  }
    	               }
    	               if (ch != 13 && ch != 10) {
    	                  doingInput = true;
    	                  cursorOn = true;
    	                  requestFocus();
    	                  while (doingInput) {
    	                     try {
    	                        Console.this.wait(300);
    	                        cursorOn = !cursorOn;
    	                        repaint();
    	                     }
    	                     catch (InterruptedException e) {
    	                        cursorOn = true;
    	                        repaint();
    	                     }
    	                  }
    	                  cursorOn = false;
    	                  repaint();
    	               }
    	               buffer = inputBuffer + (char)10;
    	               pos = 1;
    	               return buffer.charAt(0);
    	            }
    	         }
    	      }
     
    	      class COUT extends Writer { // "Standard output" is replaced in TextIO with an object of this type.
    	         public void write(int b) {
    	            write(new char[] { (char)(b & 0xFFFF) }, 0, 1);
    	         }
    	         public void write(char[] b, int offset, int length) {
    	            for (int i = offset; i < offset+length; i++) {
    	               putChar(b[i]);
    	            }
    	         }
    	         public void write(char[] b) {
    	            write(b,0,b.length);
    	         }
    	         public void close() {
    	         }
    	         public void flush() {
    	         }
    	      }
     
    	   } // end nested class Console
     
    	   static {  // static initializer opens the GUI TextIO window.
    	      JFrame frame = new JFrame("TextIO Console");
    	      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    	      console = new Console();
    	      in = standardInput = console.inputStream;
    	      out = standardOutput = console.outputStream;
    	      JPanel panel = new JPanel();
    	      panel.setLayout(new BorderLayout(2,2));
    	      panel.setBackground(Color.GRAY);
    	      panel.setBorder(BorderFactory.createLineBorder(Color.GRAY,2));
    	      panel.add(console,BorderLayout.CENTER);
    	      panel.add(console.scroller,BorderLayout.EAST);
    	      frame.setContentPane(panel);
    	      frame.pack();
    	      frame.setResizable(false);
    	      Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    	      frame.setLocation( (screenSize.width - frame.getWidth())/2, (screenSize.height - frame.getHeight())/2 );
    	      frame.setVisible(true);
    	      console.requestFocus();
    	   }
     
    	} // end of class TextIO

    ENDOFCLASSTextIO.java//////////////////////////////////////////////////////////////////

    this is the maze.txt file used the two numbers at the top define how big the maze is in the x and y (rows and coloumns)

    15 39
    121111111111111111111111111111111111111
    101000100000101010000000001000000010001
    101110111011101010101110111010111110111
    101000001010100010101010001010001000001
    101110111010111010111010111011111011111
    100010000010100000101010100010101000001
    111110111011101011111010111110111110101
    100000100000101000100000100000000000001
    101010101010111110111011101110111110111
    101010101010000010000000000010001000001
    101011101110101110111111101011111111111
    101010001010101000000010001000000000001
    111110111010101010111011111011111010101
    100000000010101010100000100000001010101
    111111111111111111111111111111111111131
    Last edited by copeg; February 9th, 2011 at 09:16 AM.


  2. #2
    Super Moderator copeg's Avatar
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    Default Re: Basic Java maze game

    First, for future reference please use the code tags. Second, you've posted a huge amount of code that many users may not want to wade through. I recommend trying to boil it down to an SSCCE.

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