基于Java GUI 事件处理方式

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener; 
public class Test{
    public static void main(String[] args) {
        JFrame frame = new JFrame("理解事件处理");
        frame.setDefaultCloseOperation(3);
        frame.setLayout(null);
 
        //创建按钮对象
        JButton button = new JButton("请单击本次按钮");
        button.setBounds(120,60,120,30);
        frame.add(button);
        //创建按钮监听器并注册，参数为事件处理者对象
        ButtonHandler buttonHandler = new ButtonHandler();
        button.addActionListener(buttonHandler);//与单击事件相关的授权处理的方法
 
        frame.setBounds(400,200,400,200);
        frame.setVisible(true);
    }
}
 
class ButtonHandler implements ActionListener{
    public void actionPerformed(ActionEvent e) {
        System.out.println("单击一次按钮");
    }
}

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
 
public class Test{
    public static void main(String[] args) {
        JFrame frame = new JFrame("深入掌握事件处理");
        frame.setDefaultCloseOperation(3);
        frame.setLayout(null);
        //创建提示 信息
        JLabel label1 = new JLabel("请在窗体内移动鼠标");
        label1.setBounds(15,5,200,25);
        frame.add(label1);
        JLabel label2 = new JLabel("或按住鼠标左键拖动鼠标");
        label2.setBounds(15,30,200,25);
        frame.add(label2);
        //创建文本框对象，检测
        JTextField text = new JTextField(30);
        text.setBounds(15,55,200,30);
        frame.add(text);
        //注册监听器，参数为事件处理者对象
        MouseListenerImp mouse = new MouseListenerImp(text);//事件处理者类  实例化
        frame.addMouseListener(mouse);
        frame.addMouseMotionListener(mouse);
        frame.addWindowListener(mouse); 
        frame.setBounds(500,250,300,150);
        frame.setVisible(true);
    }
}
 
//编写事件处理对象类  实现鼠标窗体的相关接口
class MouseListenerImp implements MouseListener, MouseMotionListener, WindowListener{
    JTextField text; 
    public MouseListenerImp(JTextField text){
        this.text = text;
    }
    public void mouseDragged(MouseEvent e){ //提供拖拽时的鼠标坐标
        String s = "托拽鼠标，坐标： x =" + e.getX() + "y = " + e.getY();
        text.setText(s);//在文本框中可输出
    }
    public void mouseEntered(MouseEvent e) {  //检查鼠标是否在窗体内
        String s = "鼠标离开了窗体";
        text.setText(s);//在文本框中可输出
    }
    public void mouseExited(MouseEvent e) {   //检查鼠标是否在窗体内
        String s = "鼠标进入了窗体";
        text.setText(s);//在文本框中可输出
    }
    public void windowClosing(WindowEvent e) {//为了式窗口能正常关闭
        System.exit(1);
    }
    //不打算实现的方法，但是因为实现接口，所以要写出来
    public void mouseMoved(MouseEvent e){}
    public void mouseClicked(MouseEvent e){}
    public void mousePressed(MouseEvent e){}
    public void mouseReleased(MouseEvent e){}
    public void windowOpened(WindowEvent e){}
    public void windowClosed(WindowEvent e){}
    public void windowIconified(WindowEvent e){}
    public void windowDeiconified(WindowEvent e){}
    public void windowActivated(WindowEvent e){}
    public void windowDeactivated(WindowEvent e){}
}