keyeventtest.java

《Java程序设计与应用》-张仕斌-源程序 《Java程序设计与应用》-张仕斌-源程序

//KeyEventTest.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

//主类实现了键盘监听接口
public class KeyEventTest extends JFrame implements KeyListener {
	private JLabel result = null;
	
	public KeyEventTest() {
		super("KeyEvent Test");
		result = new JLabel();
		
		this.getContentPane().setLayout(new FlowLayout());
		this.getContentPane().add(result);
		
		this.addKeyListener(this);   //为当前窗体添加键盘监听对象
	}
	
	public void keyPressed(KeyEvent e) {   //重写有键按下方法
		result.setText("按下:" + KeyEvent.getKeyModifiersText(e.getModifiers())+ "+" +KeyEvent.getKeyText(e.getKeyCode()));
		if (e.getKeyCode() == e.VK_X && e.isControlDown()) {  //Ctrl+X退出
			this.dispose();
			System.exit(0);
		}
	}
	
	public void keyReleased(KeyEvent e) {   //重写键放开方法
		result.setText("键放开");
	}
	
	public void keyTyped(KeyEvent e) { }    //击键方法
	
	public static void main(String[]args) {
		KeyEventTest ket = new KeyEventTest();
		ket.setSize(400,100);
		ket.setDefaultCloseOperation(EXIT_ON_CLOSE);
		ket.setVisible(true);
	}
}