Question

java监听鼠标事件的问题

import acm.graphics.*;
import acm.program.*;
import java.awt.*;
import java.awt.event.*;public class MouseTracker extends GraphicsProgram {

public void run() {
label = new GLabel("X: /Y: .");
//label.setFont("Times New Roman-36");
add(label, 50, 50);

addMouseListeners();
}

public void MouseMoved(MouseEvent e){
label.setLabel("X: "+e.getX()+"/Y: "+e.getY()+"."); }

private GLabel label;

} 这段代码运行后不起作用呀，mousemoved()方法不起作用，鼠标移动的时候，label的内容没有变化。 请帮我看看有什么问题

Answer 1

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class test extends JFrame implements Runnable{
public static int x,y,direction=0;
public test(){
this.setSize(600,400);
this.setVisible(true);
x=this.getContentPane().getWidth()/2;
y=this.getContentPane().getHeight()/2;
this.addKeyListener(new KeyAdapter(){
public void keyPressed(KeyEvent e){
switch(e.getKeyCode()){
case KeyEvent.VK_DOWN:
direction=1;break;
case KeyEvent.VK_LEFT:
direction=2;break;
case KeyEvent.VK_RIGHT:
direction=3;break;
case KeyEvent.VK_UP:
direction=4;break;
}
}
});
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String args[]){
test t=new test();
new Thread(t).start();
}
public void paint(Graphics g){
g.setColor(Color.white);
g.fillRect(0,0,this.getWidth(),this.getHeight());
g.setColor(Color.red);
g.drawRect(x-60,y-40,120,80);
}
public void run(){
while(true){
try{
Thread.sleep(100);
}catch(Exception e){}
switch(direction){
case 1: y =4;break;
case 2: x-=4;break;
case 3: x =4;break;
case 4: y-=4;break;
}
this.repaint();
}
}
}