14.txt

java2应用开发指南第一版

例程14-1
//UseListenerDemo.Java
import Java.awt.*;
import Java.awt.event.*;
import Java.applet.Applet;
public class UseListenerDemo extends Applet 
{
    //Applet的初始化方法
    public void init()
    {
        //创建按钮（事件源）
        Button button = new Button("事件源按钮");
        //给按钮添加事件监听器
        button.addMouseListener(new ButtonMouseListener());
        //把按钮加入到Applet容器中
        add(button);
    }
}
//事件监听器类的实现
class ButtonMouseListener implements MouseListener 
{
    //鼠标进入事件
    public void mouseEntered(MouseEvent event) 
    { 
        System.out.println("Mouse Entered Button");
    }
    //鼠标移出事件
    public void mouseExited(MouseEvent event) 
    { 
        System.out.println("Mouse Exited Button");
    }
    //鼠标按下事件
    public void mousePressed (MouseEvent event) { }
    //鼠标点击事件
    public void mouseClicked (MouseEvent event) { }
    //鼠标释放事件
    public void mouseReleased(MouseEvent event) { }
}



例程14-2
//UseAdapterDemo.Java
import Java.awt.*;
import Java.awt.event.*;
import Java.applet.Applet;

public class UseAdapterDemo extends Applet
{
    //Applet的初始化方法
    public void init()
    {
        //创建按钮（事件源）
        Button button = new Button("事件源按钮");
        //给按钮添加事件适配器
        button.addMouseListener(new ButtonMouseAdapter ());
        //把按钮加入到Applet容器中
        add(button);
    }
}
//事件适配器类的实现
class ButtonMouseAdapter extends MouseAdapter 
{
    //鼠标进入事件
    public void mouseEntered(MouseEvent event) 
    { 
        System.out.println("Mouse Entered Button");
    }
    //鼠标移出事件
    public void mouseExited(MouseEvent event) 
    { 
        System.out.println("Mouse Exited Button");
    }
}



例程14-3
//KeyEventDemo.Java
import Java.awt.*;
import Java.awt.event.*;
public class KeyEventDemo extends Frame 
{
	private TextField tf = new TextField(10);

	public KeyEventDemo()
	{
		tf.addKeyListener(new TextfieldListener());
		//把文本域组件加入到框架窗口中
		add(tf);
		//显示框架窗口
		pack();
		setVisible(true);
	}
	//程序的入口方法
	public static void main( String[] args ) 
	{
		KeyEventDemo frame=new KeyEventDemo();
		//设置框架窗体的事件适配器监听(关闭窗体事件)
		frame.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e)
			{
				System.exit(0);
			}
		});		
	}
	//实现了键盘事件监听器接口的类
	class TextfieldListener implements KeyListener {
		int nKeycode;
		//键盘按下事件
		public void keyPressed(KeyEvent e) {
			nKeycode=e.getKeyCode();
			System.out.println("KEY_PRESSED:  "+e.getKeyText(nKeycode));
		}
		//键盘释放事件
		public void keyReleased(KeyEvent e) {
			nKeycode=e.getKeyCode();
			System.out.println("KEY_RELEASED:  "+e.getKeyText(nKeycode));
		}
		//键盘中的非系统键
		public void keyTyped(KeyEvent e) {
			nKeycode=e.getKeyCode();
			System.out.println("KEY_TYPED:  "+e.getKeyText(nKeycode)); 
		}
	}
}



例程14-4
//MouseEventDemo.Java
import Java.awt.*;
import Java.awt.event.*;
public class MouseEventDemo extends Frame 
{
	//构造方法
	public MouseEventDemo()
	{
		Button btnMouse=new Button("测试鼠标事件");
		//添加鼠标事件
		btnMouse.addMouseListener(new MyMouseListener() );
		//添加鼠标移动事件
		btnMouse.addMouseMotionListener(new MyMouseMotionListener());
		
		this.setLayout(new FlowLayout());
		this.add(btnMouse);
		//显示框架窗口
		this.setSize(400,300);
		this.setVisible(true);
	}
	//程序的入口方法
	public static void main( String[] args ) 
	{
		MouseEventDemo frame=new MouseEventDemo();
		//设置框架窗体的事件适配器监听(关闭窗体事件)
		frame.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e)
			{
				System.exit(0);
			}
		});		
	}
	//扩展了鼠标事件监听事件适配器器的类
	class MyMouseListener extends MouseAdapter 
	{
		//mouse Click event
		public void mouseClicked(MouseEvent e) {
			if( e.isPopupTrigger() )
				System.out.println("你现在单击鼠标右键");
			if( e.getClickCount() == 2 )
				System.out.println("你现在双击鼠标");
		}
		//mouse enter event
		public void mouseEnterred(MouseEvent e){
			System.out.println("鼠标进入组件区域");
		}
	}
	//扩展了鼠标移动监听事件适配器的类
	class MyMouseMotionListener extends MouseMotionAdapter
	{
		public void mouseMoved(MouseEvent e){
			System.out.println("鼠标组件区域内移动");
		}
	}
}



例程14-5
//WindowEventDemo.Java
import Java.awt.*;
import Java.awt.event.*;
public class WindowEventDemo extends Frame 
{
	public WindowEventDemo()
	{
		//设置框架窗体的事件监听
		this.addWindowListener(new TestWindowListener());
			
		//设置大小和显示
		setSize(400,300);
		setVisible(true);
	}
	//程序的入口方法
	public static void main( String[] args ) 
	{
		//创建框架窗口
		new WindowEventDemo();		
	}
	class TestWindowListener implements WindowListener 
	{
		public void windowActivated(WindowEvent e) {
			System.out.println("window activated");
		}
		public void windowClosed(WindowEvent e) {
			System.out.println("window closed");
			System.exit(0);
		}
		public void windowClosing(WindowEvent e) {
			System.out.println("window closing ...");
			Window w = e.getWindow();
			w.dispose();
		}
		public void windowDeactivated(WindowEvent e) {
			System.out.println("window deactivated");
		}
		public void windowDeiconified(WindowEvent e) {
			System.out.println("window deiconified");
		}
		public void windowIconified(WindowEvent e){
			System.out.println("window Iconified");
		}
		public void windowOpened(WindowEvent e) {
			System.out.println("window opened");
		}
	}
}