LLL_QQQ
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于 2004-09-14 17:29
非常感谢^_^! <1>是不是事件适配器只能继承,而不能通过接口来实现呢? <2>怎样编写才能不必再写所不关心的事件:如本例<见下面>的 public void mousePressed(MouseEvent e) {} public void mouseReleased(MouseEvent e){} public void mouseClicked(MouseEvent e){}(假如我不关心这个事件); 附:
import java.awt.*; import java.awt.event.*;
public class SSS extends MouseMotionAdapter implements MouseListener { private Frame f; private TextField tf; public static void main(String args[]){ SSS two=new SSS(); two.go(); } public void go(){ f=new Frame("Two listener example"); f.add(new Label("Click and drag the mouse"),"North"); tf=new TextField(30); f.add(tf,"South"); //注册监听程序 f.addMouseMotionListener(this); f.addMouseListener(this); f.setSize(300,300); f.setVisible(true); }
//实现MouseMotionListener接口中的方法
public void mouseDragged(MouseEvent e){ String s="鼠标拖动="+e.getX()+"Y="+e.getY(); tf.setText; } public void mouseEntered(MouseEvent e){
String s="鼠标进入"; tf.setText; } public void mouseExited(MouseEvent e){ String s="鼠标离开"; tf.setText; } public void mousePressed(MouseEvent e) {} public void mouseReleased(MouseEvent e){} public void mouseClicked(MouseEvent e){} }
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