Java窗体中的事件处理之Button

Java中的事件处理机制：

监听器对象是一个实现了特定监听器接口（Listener Interface）类的实例

事件源是一个能够注册监听器对象并发送事件对象的对象

当事件发送时候，事件源将事件对象传递给所以注册的监听器

监听器对象将利用事件对象中的信息决定如何做出响应

创建一个Buttontest窗体，里面包含三个按钮，点击按钮改变面板的背景颜色：

package com.Project_Button01;

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

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

public class ButtonFrame extends JFrame{
public ButtonFrame(){
this.setTitle("Buttontest");
this.setSize(400,400);

//create button
JButton yellowbutton=new JButton("Yellow");
JButton bluebutton=new JButton("Blue");
JButton redbutton=new JButton("red");

//add buttons to panel
buttonPanel=new JPanel();
buttonPanel.add(yellowbutton);
buttonPanel.add(bluebutton);
buttonPanel.add(redbutton);

//add panel to frame
this.add(buttonPanel);

//craete button actions
yellowbutton.addActionListener(new ColorAction(Color.YELLOW));
bluebutton.addActionListener(new ColorAction(Color.BLUE));
redbutton.addActionListener(new ColorAction(Color.RED));
yellowbutton.addMouseListener(new MouseListener() {

@Override
public void mouseReleased(MouseEvent e) {
// TODO Auto-generated method stub
System.out.println("mouseReleased");
}

@Override
public void mousePressed(MouseEvent e) {
// TODO Auto-generated method stub
System.out.println("mousePressed");
}

@Override
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
System.out.println("mouseExited");
}

@Override
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
System.out.println("mouseEntered");
}

@Override
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub

}
});
}

public class ColorAction implements ActionListener{
public ColorAction(Color c){
backgroundColor=c;
}

private Color backgroundColor;

@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
buttonPanel.setBackground(backgroundColor);
}
}
private JPanel buttonPanel;
}

程序入口：

package com.Project_Button01;

import java.awt.EventQueue;

import javax.swing.JFrame;

public class StartMian {

public static void main(String[] args) {
// TODO Auto-generated method stub
EventQueue.invokeLater(new Runnable() {

@Override
public void run() {
// TODO Auto-generated method stub
ButtonFrame frame=new ButtonFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}

}