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Thread: Using a scanner to input row an column sizes for my grid from a file PLEASE HELP

  1. #1
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    Default Using a scanner to input row an column sizes for my grid from a file PLEASE HELP

    Hello Im brand new to this forum I'm very new to java programming Im working on a programming exercise that I have to create a word search using a 2d array. I have 2 questions the first on being is I have to use the Scanner class to read in # of rows and cols then instantiate a char[][] of that size, and store it in grid then fill grid with random chars. Im not sure how to go about doing this as far as reading from a file an using that info to make the size of my array

    thnak you for your help


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    Default Re: Using a scanner to input row an column sizes for my grid from a file PLEASE HELP

    You could use properties. It's VERY basic, perfect when you just need to store 1-5 basic variables (EG, int, String, long, double).
    /*
     * Precondition -> file is a String to the loccation of the file,
     */
    FileReader fr = new FileReader(file);
    Properties prop = new Properties();
    prop.load(fr);
    int rows = Integer.valueOf(prop.get("rows"));
    int cols = Integer.valueOf(prop.get("cols"));

    Later, for storing
    FileWriter out = new FileWriter(file);
    prop.setProperty("rows", rows+"");
    prop.setProperty("cols", cols+"");
    prop.store(out, "--No Comment--");
    out.close();
    Last edited by Tjstretch; October 19th, 2011 at 07:32 PM.

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    Default Re: Using a scanner to input row an column sizes for my grid from a file PLEASE HELP

    thank you this helped I need help with placing my words in my grid using a switch statement , here is what I have thus far

    public class WordSearchlab3
    {



    public static void main(String[] args) throws IOException
    {
    generateWordSearchProblem("Instructions");

    }

    public static void generateWordSearchProblem(String filename)
    throws IOException
    {
    Scanner scan = new Scanner(new File(filename));

    char[][] grid;

    grid = makeGrid(scan);
    // placeWords(grid, scan);
    printGrid(grid);
    }

    public static char[][] makeGrid(Scanner scan) throws IOException
    {


    Scanner input = new Scanner(System.in);

    int r = scan.nextInt();
    int c = scan.nextInt(); // varibles

    char[][] grid = new char[r][c];

    for (int i = 0; i < grid.length; i++)
    {

    for (int c2 = 0; c2 < grid[i].length; c2++)
    {

    Random rng = new Random();
    char j = (char) (rng.nextInt(26) + 'a');

    grid [i][c2] =j ;

    }

    }

    return grid ;

    }
    public static void placeWords(char[][] grid, Scanner scan)
    {

    int startRow = scan.nextInt();
    int StartCol = scan.nextInt();

    String direction = scan.next();
    String word = scan.next();


    switch (direction.charAt(0)) {

    case 'N':

    case 'S':

    case 'E':

    case 'W':


    }







    // use the Scanner to read in each line of the text file
    // obtain the starting row, starting col, direction and word
    // use that to place the word in the grid
    }

    public static void printGrid(char[][] grid)


    {
    for (int i = 0; i < grid.length; i++)
    {
    for (int k = 0; k < grid[i].length; k++)
    {
    System.out.print(grid[i][k]);
    }
    System.out.print("\n");
    }
    }
    }

    This is the output of the sample I need 10 , 15 represents the size of the grid 0 0 HELLO is the direction Im trying to get these words implemented into my grid using a switch statement

    10 15
    0 0 S HELLO
    5 9 W GOODBYE
    3 2 E HELP
    would produce this grid:
    Huhksdoval
    Ethlrwayrz
    Lttxkkwlcu
    LsHELPpgyg
    Owylzoigvi
    tqhEYBDOOG
    kcqjrlalgj
    qbeqhnhjeh
    niqzjkyyir
    vtfdefbhjt

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    Default Re: Using a scanner to input row an column sizes for my grid from a file PLEASE HELP

    Highlight your code with
    [highlight=Java] and [/highlight]

  5. #5
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    Default Re: Using a scanner to input row an column sizes for my grid from a file PLEASE HELP

    I m not sure hot to do that sorry could you show me to do that

    thanks

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    Default Re: Using a scanner to input row an column sizes for my grid from a file PLEASE HELP

    <script type="text/javascript">
    <!--
       public class WordSearchlab3
    {
     
     
     
    	public static void main(String[] args) throws IOException
    	{
    		generateWordSearchProblem("Instructions");
     
    	}
     
    	public static void generateWordSearchProblem(String filename)
    		throws IOException
    	{
    		Scanner scan = new Scanner(new File(filename));
     
    		char[][] grid;
     
    		grid = makeGrid(scan);
    //		placeWords(grid, scan);
    		printGrid(grid);
    	}
     
    	public static char[][] makeGrid(Scanner scan) throws IOException
    	{
     
     
    		Scanner input = new Scanner(System.in);
     
    		int r = scan.nextInt();
    		int c = scan.nextInt();  // varibles 
     
    		char[][] grid = new char[r][c];
     
    		for (int i = 0; i < grid.length; i++)
    		{
     
    			for (int c2 = 0; c2 < grid[i].length; c2++)
    			{
     
    			Random rng = new Random();
    			char j = (char) (rng.nextInt(26) + 'a');
     
             grid [i][c2] =j ; 
     
    			}
     
    		}
     
    	    return grid ;
     
    	}
    	public static void placeWords(char[][] grid, Scanner scan)
    	{
     
    	    int startRow = scan.nextInt(); 
    		 int StartCol = scan.nextInt();
     
    		 String direction = scan.next(); 
    		 String word = scan.next();
     
     
    		 switch  (direction.charAt(0))     { 
     
    			 case 'N':  
     
    			 case 'S': 
     
    			 case 'E': 
     
    			 case 'W': 
     
     
    		}
     
     
     
     
     
     
     
    		// use the Scanner to read in each line of the text file
    		// obtain the starting row, starting col, direction and word
    		// use that to place the word in the grid
    	}
     
    	public static void printGrid(char[][] grid)
     
     
    	{
    		for (int i = 0; i < grid.length; i++)
    		{
    			for (int k = 0; k < grid[i].length; k++)
    			{
    				System.out.print(grid[i][k]);
    			}
    			System.out.print("\n");
    		}
    	}
    }
    //-->
    </script>

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