Java高级教程：事件处理

Applet类从Container类继承了许多事件处理方法。Container类定义了几个方法，例如：processKeyEvent()和processMouseEvent()，用来处理特别类型的事件，还有一个捕获所有事件的方法叫做processEvent。

　

　为了响应一个事件，applet必须重写合适的事件处理方法。
 

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import java.awt.event.MouseListener; import java.awt.event.MouseEvent; import java.applet.Applet; import java.awt.Graphics;    public class ExampleEventHandling extends Applet implements MouseListener {    StringBuffer strBuffer;    public void init() { addMouseListener( this ); strBuffer = new StringBuffer(); addItem( "initializing the apple " ); }    public void start() { addItem( "starting the applet " ); }    public void stop() { addItem( "stopping the applet " ); }    public void destroy() { addItem( "unloading the applet" ); }    void addItem(String word) { System.out.println(word); strBuffer.append(word); repaint(); }    public void paint(Graphics g) { //Draw a Rectangle around the applet's display area. g.drawRect( 0 , 0 , getWidth() - 1 , getHeight() - 1 );    //display the string inside the rectangle. g.drawString(strBuffer.toString(), 10 , 20 ); }       public void mouseEntered(MouseEvent event) { } public void mouseExited(MouseEvent event) { } public void mousePressed(MouseEvent event) { } public void mouseReleased(MouseEvent event) { }    public void mouseClicked(MouseEvent event) { addItem( "mouse clicked! " ); } }

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