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Thread: Writing Output To New File

  1. #1
    Junior Member
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    Default Writing Output To New File

    Hi,

    Basically I have been given the task of writing a basic compression program. So far I have got what I want to print to the screen. All I need to do now if write it to a new file.

    I know this is a very simple thing to do, but I cant figure it out, I keep getting various error messages. Basically I want to write to a new file what is being printed on the screen (System.out.println(RLE.encode(line))(line 43).

    Any help appreciated,
    Scott


    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    import java.util.Scanner;
    import java.io.File;
    import java.io.FileNotFoundException;
    import java.io.PrintWriter;
    import java.io.*;
     
     
    public class RunLengthEncoding {
     
     
    	public String encode(String source) {
    		StringBuffer dest = new StringBuffer();
    		for (int i = 0; i < source.length(); i++) {
    			int runLength = 1;
    			while( i+1 < source.length() && source.charAt(i) == source.charAt(i+1) ) {
    				runLength++;
    				i++;
    			}
    			dest.append(runLength);
    			dest.append(source.charAt(i));
    		}
    		return dest.toString();
    	}
     
    	public static void main(String[] args) {
    		String fileName = "out.txt";
    		Scanner inputStream = null;
    		try
    		{
    			inputStream = new Scanner(new File(fileName));
    		}
    		catch(FileNotFoundException e)
    		{
    			System.out.println("Error");
    			System.exit(0);
    		}
    		while (inputStream.hasNextLine())
    		{
    			String line = inputStream.nextLine();
    			RunLengthEncoding RLE = new RunLengthEncoding();
    			System.out.println(RLE.encode(line));
    		}
    		inputStream.close();
     
    	}
    }


  2. #2
    Super Moderator copeg's Avatar
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    Default Re: Writing Output To New File

    See this post: How to write read binary data. Depending upon how your encryption works, you may wish to use a DataOuptutStream or something like a BufferedWriter. Given the System prints what you expect, try using a FileWriter and BufferedWriter to write to the output file. Google these and you'll find lots of examples on how to use them

  3. The Following User Says Thank You to copeg For This Useful Post:

    Scottj996 (January 7th, 2010)

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