multilistener.java

来自「这是一个java程序」· Java 代码 · 共 71 行

/******************************************
*         class MultiListener(version 1.1)
*******************************************/
import java.awt.*;
import java.awt.event.*;

public class MultiListener implements MouseListener,MouseMotionListener,WindowListener
//实现多个监听器接口
{
	private Frame f;
	private TextField tf;

	public static void main(String args[])
	{
		MultiListener ml = new MultiListener();
		ml.go();
	}
	public void go()
	{
		Frame f = new Frame("MultiListener Test 1.1");
		f.add( new Label("Click and Drag the mouse"), "North" );
		tf = new TextField(30);
		f.add( tf, "South");

		//同时监听容器f上发生的多种事件
		f.addMouseListener(this);
		f.addMouseMotionListener(this);
		f.addWindowListener(this);

		f.resize(200,200);
		f.show();

	}
	//MouseMotionListener
	public void mouseDragged(MouseEvent e)
	{
		//通过事件获得其详细信息
	    String s = "Mouse dragging : X = " + e.getX() + " Y = " + e.getY();
		tf.setText(s);
	}
	public void mouseMoved(MouseEvent e){}

	//MouseListener
	public void mouseEntered(MouseEvent e)
	{
		String s = "The mouse Entered";
		tf.setText(s);
	}
	public void mouseExited(MouseEvent e)
	{
		String s = "The mouse Exited";
		tf.setText(s);
	}
	public void mouseClicked(MouseEvent e){}
	public void mousePressed(MouseEvent e){}
	public void mouseReleased(MouseEvent e){}

	//WindowListener
	//注意关闭窗口的方法是windowClosing()，而不是windowClosed()
	public void windowClosing(WindowEvent e)
	{
		System.exit(1);
	}
	public void windowClosed(WindowEvent e){}
	public void windowOpened(WindowEvent e){}
	public void windowIconified(WindowEvent e){}
	public void windowDeiconified(WindowEvent e){}
	public void windowDeactivated(WindowEvent e){}
	public void windowActivated(WindowEvent e){}
}