java鼠标与键盘事件监听

package cn.stat.p3.windowdemo;

import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.TextField;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class shijiandemo {

private Frame f;
private TextField tf;
private Button but;

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
new shijiandemo() ;
}

public shijiandemo() {
super();
init();
}

private void init() {
f=new Frame("鼠标与键盘事件监听");

f.setBounds(200,200,400,400);

f.setLayout(new FlowLayout());

tf=new TextField(15);
but=new Button("这是一个按钮");
f.add(tf);
f.add(but);

f.setVisible(true);
myevent();

}

private void myevent() {

//添加键盘事件
tf.addKeyListener(new KeyAdapter() {

@Override
public void keyPressed(KeyEvent e) {
// 设定只能输入数字
int code=e.getKeyCode();
if(!(code>=KeyEvent.VK_0 && code<=KeyEvent.VK_9))
{
System.out.println("必须是数字");
e.consume();
}

}
});

//添加窗体事件
f.addWindowListener(new WindowAdapter() {

@Override
public void windowClosing(WindowEvent e) {
// TODO Auto-generated method stub
System.exit(0);
}
});

//添加鼠标事件
but.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
if(e.getClickCount()==1)
{
tf.setText("单击了");
}
if(e.getClickCount()==2)
{
tf.setText("双击了");
}

}

private int count=0;

@Override
public void mouseEntered(MouseEvent e) {

but.setLabel("鼠标触发了"+count++);
}
});

}

}