Thread: 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();
 
	}
}

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