import java.awt.*;
import java.awt.event.*;

public class TextWatcher extends java.applet.Applet { 
	TextArea area1, area2;
	
	public void init() {
		setLayout( new GridLayout(2,1) );
		add( area1 = new TextArea() );
		add( area2 = new TextArea() );
		area1.addTextListener ( new TextSyncAdapter( area2 ));
		area2.addTextListener ( new TextSyncAdapter( area1 ));
	}

	class TextSyncAdapter implements TextListener {
		TextArea targetArea;

		TextSyncAdapter( TextArea targetArea ) {
			this.targetArea = targetArea;
		}
		public void textValueChanged(TextEvent e) {
			TextArea sourceArea = (TextArea)e.getSource();
			if ( ! targetArea.getText().equals( sourceArea.getText() ) )
				targetArea.setText( sourceArea.getText() );
		}
	}
}