三种监听的使用

鼠标监听 模拟画图

package com.Swing;

import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.ArrayList;
import java.util.Iterator;

public class TestMouthPaint {
    public static void main(String[] args) {
        new MouthPaint("画画");
    }
}
class MouthPaint extends Frame{
    ArrayList points;
    public MouthPaint(String name){
        super(name);
        setVisible(true);
        setBounds(300,300,500,500);

        //存放鼠标的点
        points = new ArrayList();
        //鼠标监听器 针对窗口 在窗口点
        addMouseListener(new MyMouseListener());
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }


    @Override
    public void paint(Graphics g) {
        //画画 监听鼠标事件
        Iterator iterator = points.iterator();
        while (iterator.hasNext()){
            Point next =(Point) iterator.next();
            g.setColor(Color.cyan);
            g.fillOval(next.x,next.y,20,20);
        }
    }
    public void addPoint(Point point){
        points.add(point);
    }
    class MyMouseListener extends MouseAdapter{
        //鼠标点击
        @Override
        public void mousePressed(MouseEvent e) {
            MouthPaint frame = (MouthPaint) e.getSource();
            //点击的时候产生一个点
            frame.addPoint(new Point(e.getX(),e.getY()));
            //每次点击鼠标 重画一遍所有的
            frame.repaint();
        }
    }
}

窗口监听

package com.Swing;

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class TestWindowsListener {
    public static void main(String[] args) {
        new Listener().loading();
    }
}
class Listener extends Frame{
    public void loading(){
        setVisible(true);
        setBounds(100,100,500,500);

        addWindowListener(new WindowAdapter() {
            //窗口正在关闭时
            @Override
            public void windowClosing(WindowEvent e) {
                System.out.println("windowClosing");
                System.exit(0);
            }

            //窗口被激活时
            @Override
            public void windowActivated(WindowEvent e) {
                System.out.println("windowActivated");
                setTitle("我又出现了");
            }

        });
    }
}

键盘监听

package com.Swing;

import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class TestKeyListener {
    public static void main(String[] args) {
        new Key().loading();
    }
}
class Key extends Frame{
    public void loading(){
        setVisible(true);
        setBounds(100,100,300,300);

        addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                //获取当前键盘下是哪个键 KeyCode值
                int keyCode = e.getKeyCode();

                System.out.println(keyCode);

                //判断如果是 上键 输出
                if(keyCode == KeyEvent.VK_UP){
                    System.out.println("上键");
                }

            }
        });

        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}