swing 事件處理器

1、事件處理器

package com.jlwang.swing;

import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class ListenerDemo1 
{
	private static JFrame frame;
	
	private static JPanel panel;
	
	private static JButton button1;
	
	private static JButton button2;
	
	private class Button1Handler implements ActionListener
	{

		@Override
		public void actionPerformed(ActionEvent e) 
		{
			JOptionPane.showMessageDialog(frame, "button1 clicked!");
		}
		
	}
	
	private class Button2Handler implements ActionListener
	{

		@Override
		public void actionPerformed(ActionEvent e) 
		{
			JOptionPane.showMessageDialog(frame, "button2 Clicked!");
			
		}
		
	}

	public ListenerDemo1() 
	{
		super();
		
		panel = new JPanel();
		button1 = new JButton("button1");
		
		button2 = new JButton("button2");
		
		button1.addActionListener(new Button1Handler());
		button1.setPreferredSize(new Dimension(200,200));
		button2.addActionListener(new Button2Handler());
		button2.setPreferredSize(new Dimension(200,200));
		
		panel.add(button1);
		panel.add(button2);
	}
	
	public static void main(String[] args) 
	{
		ListenerDemo1 listenerDemo1 = new ListenerDemo1();
		frame = new JFrame("Demo 1");
		
		frame.addWindowListener(new WindowAdapter()
		{

			@Override
			public void windowClosing(WindowEvent e) 
			{
				// TODO Auto-generated method stub
				super.windowClosing(e);
				System.exit(0);
			}
			
		});
		
		frame.getContentPane().add(panel);
		frame.pack();
		frame.setVisible(true);

		
	}

}
           

2、事件處理器

package com.jlwang.swing;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class ListenerDemo2 
{
	private static JFrame frame;
	
	private static JPanel panel;
	
	private static JButton button1;
	
	private static JButton button2;

	public ListenerDemo2() 
	{
		super();
		
		panel = new JPanel();
		button1 = new JButton("button1");
		button2 = new JButton("button2");
		
		ListenerHandler listenerHandler = new ListenerHandler();
		button1.addActionListener(listenerHandler);
		button2.addActionListener(listenerHandler);
		
		panel.add(button1);
		panel.add(button2);
		
	}
	
	private class ListenerHandler implements ActionListener
	{

		@Override
		public void actionPerformed(ActionEvent e) 
		{
			String buttonName = e.getActionCommand();
			
			if(buttonName.equals("button1"))
			{
				JOptionPane.showMessageDialog(frame, "button1 Clicked");
			}else if(buttonName.equals("button2"))
			{
				JOptionPane.showMessageDialog(frame, "button2 Clicked!");
			}
			
		}
	
	}
	
	public static void main(String[] args) 
	{
		ListenerDemo2 listenerDemo2 = new ListenerDemo2();
		
		frame = new JFrame("listener demo2");
		
		frame.addWindowListener(new WindowAdapter()
		{

			@Override
			public void windowClosing(WindowEvent e) 
			{
				System.out.println("22222");
				// TODO Auto-generated method stub
				super.windowClosed(e);
				System.exit(0);
			}

			
		});
		
		frame.getContentPane().add(panel);
		frame.pack();
		frame.setVisible(true);
		
	}

}
           

3、事件處理器

package com.jlwang.swing;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class ListenerDemo3 
{
	private static JFrame frame;
	
	private static JPanel panel;
	
	private static JButton button1;
	
	private static JButton button2;

	public ListenerDemo3() 
	{
		super();
		
		panel = new JPanel();
		button1 = new JButton("button1");
		button2 = new JButton("button2");
		
		button1.addActionListener(new ActionListener()
		{

			@Override
			public void actionPerformed(ActionEvent e) 
			{
				JOptionPane.showMessageDialog(frame, "button1 Clicked!");
			}
			
		});
		button2.addActionListener(new ActionListener()
		{

			@Override
			public void actionPerformed(ActionEvent e) 
			{
				JOptionPane.showMessageDialog(frame, "button2 Clicked!");
			}
			
		});
		
		panel.add(button1);
		panel.add(button2);
		
	}
	
	public static void main(String[] args) 
	{
		ListenerDemo3 listenerDemo2 = new ListenerDemo3();
		
		frame = new JFrame("listener demo3");
		
		frame.addWindowListener(new WindowAdapter()
		{

			@Override
			public void windowClosing(WindowEvent e) 
			{
				super.windowClosed(e);
				System.exit(0);
			}

		});
		
		frame.getContentPane().add(panel);
		frame.pack();
		frame.setVisible(true);
		
	}

}