addremovelistener.java

来自「这是关于java事件的源代码」· Java 代码 · 共 55 行

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class  AddRemoveListener extends JFrame
{
	JPanel panel;
	JTextField jtf;
	JButton button;
	MMListener mml;
	public AddRemoveListener()
	{
		mml=new MMListener();
		jtf=new JTextField(30);
		jtf.setEditable(false);

		panel=new JPanel();
		panel.setBackground(Color.yellow);
		panel.addMouseMotionListener(mml);

		button=new JButton("remove");
		button.setBorder(BorderFactory.createRaisedBevelBorder());
		button.setFont(new Font("Serif",Font.PLAIN,14));
		button.addActionListener(new ButtonListener());

		JPanel p=new JPanel();
		p.add(jtf);
		p.add(button);
		getContentPane().add(panel,BorderLayout.CENTER);
		getContentPane().add(p,BorderLayout.SOUTH);

		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100,100,500,500);
		setVisible(true);
	}
	class ButtonListener implements ActionListener
	{
		public void  actionPerformed(ActionEvent e)
		{
			panel.removeMouseMotionListener(mml);
			jtf.setText("");
		}
	}
	class MMListener extends MouseMotionAdapter
	{
		public void mouseMoved(MouseEvent e)
		{
			jtf.setText("mouse position:"+e.getX()+","+e.getY());
		}
	}
	public static void main(String[] args) 
	{
		AddRemoveListener li=new AddRemoveListener();
	}
}