Text Watcher Applet

//  this applet sets up two TextAreas where the user can type text.
//  when the user types a character in either TextArea the character
//  is copied into the other TextArea

import java.awt.*;
import java.awt.event.*;
public class TextWatcher11 extends java.applet.Applet
                                implements KeyListener
{
    private TextArea top;
    private TextArea bottom;
    private Panel topPanel;
    private Panel bottomPanel;

//  create two Panels and the two text areas, add the text
//  areas to the Panels and add the Panels to the applet
//  the TextAreas are placed inside Panels so that their
//  size can be specified

    public void init()
    {
        setLayout( new GridLayout(2,1) );
        topPanel = new Panel();
        bottomPanel = new Panel();
        topPanel.add( top = new TextArea(5,40) );
        bottomPanel.add( bottom = new TextArea(5,40) );
        add(topPanel);
        add(bottomPanel);
        top.addKeyListener(this);
        bottom.addKeyListener(this);
    }

//  this method will receive an event when the user presses a key
//  it checks which TextArea generated the event and copy the
//  character typed to the other TextArea.

//  the character typed is converted to a String so that it can be
//  appended to the text in the TextArea

    public void keyPressed(KeyEvent e)
    {
        if (e.getComponent() == top)
            bottom.appendText((new Character(e.getKeyChar())).toString());
        if (e.getComponent() == bottom)
            top.appendText((new Character(e.getKeyChar())).toString());
    }

//  empty methods to satisfy the KeyListener interface

    public void keyReleased(KeyEvent e) { }
    public void keyTyped(KeyEvent e) { }
}