System.out.println() Print to JFrame

Question

I just wrote a rather large java application and now want to develop a GUI for it. I have never developed GUI and am trying to use the API's for help. Can anyone point me in the right direction: I am trying to take everything that is printed out with System.out.println() and print it inside a JFrame. Any help would be magnificent.
-Alex

Answer 1

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) {}
}