Infrastructure Software

Add a JTextArea to your frame, create a TextAreaOutputStream with it, and use System.setOut(...) to set System.ouot

/*
 * Created on Mar 13, 2005 by @author Tom Jacobs
 *
 */
package tjacobs;

import java.io.IOException;
import java.io.OutputStream;

import javax.swing.JTextArea;
import javax.swing.text.JTextComponent;

/**
 * TextAreaOutputStream creates an outputstream that will output to the
 * given textarea. Useful in setting System.out
 */
public class TextAreaOutputStream extends OutputStream {
	public static final int DEFAULT_BUFFER_SIZE = 1;
	
	JTextArea mText;
	byte mBuf[];
	int mLocation;
	public TextAreaOutputStream(JTextArea component) {
		this(component, DEFAULT_BUFFER_SIZE);
	}

	public TextAreaOutputStream(JTextArea component, int bufferSize) {
		mText = component;
		if (bufferSize < 1) bufferSize = 1;
		mBuf = new byte[bufferSize];
		mLocation = 0;
	}
	@Override
	public void write(int arg0) throws IOException {
		//System.err.println("arg = "  + (char) arg0);
		mBuf[mLocation++] = (byte)arg0;
		if (mLocation == mBuf.length) {
			flush();
		}
	}
	
	public void flush() {
		mText.append(new String(mBuf, 0, mLocation));
		mLocation = 0;
/*
		try {
			Thread.sleep(1);
		}
		catch (Exception ex) {}
	}
	*/
	}
}

Thanks for the sample, it's very useful :)