Java学习笔记--GUI之AWT-Window、key、鼠标响应

鼠标监听
思路：
画板<-画笔（画笔只会画一次）<-读-<存点的集合<–鼠标（监听事件x，y 鼠标每次点击就重画一次）

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

public class TestMouseListener {
    //鼠标监听事件
    public static void main(String[] args) {
        new MyFrame("画图");
    }
}

//自己的类
class MyFrame extends Frame{
    //画画需要画笔，需要监听鼠标当前位置，需要集合来存储这个点
    ArrayList points;
    public MyFrame(String title){
        super(title);
        setBounds(200,200,400,300);
        //存鼠标点击的点
        points=new ArrayList();

        //鼠标监听器，针对窗口
        this.addMouseListener(new  MyMouseListener());
        setVisible(true);
    }

    @Override
    public void paint(Graphics g) {
        //画画，监听鼠标事件
        Iterator iterator=points.iterator();
        while (iterator.hasNext()){
            Point point=(Point) iterator.next();
            g.setColor(Color.green);
            g.fillOval(point.x,point.y,10,10);
        }
    }
    //添加一个点到界面上
    public void addPaint (Point point){
        points.add(point);
    }

    //适配器模式
    private class MyMouseListener extends MouseAdapter{
        //鼠标 按下，弹起，按住不放
        @Override
        public void mousePressed(MouseEvent e) {
            MyFrame myFrame =(MyFrame) e.getSource();//返回当前对象,这里是Frame拉调用的，放回的应该是Frame
            //这个我们点击的时候，就会在界面上产生一个点。
            //这个点就是鼠标的点
            myFrame.addPaint(new Point(e.getX(),e.getY()));

            //每次点击鼠标都需要重新画一遍
            myFrame.repaint();//刷新
        }
    }

}

/*
思路：
画板<-画笔（画笔只会画一次）<-读-<存点的集合<--鼠标（监听事件x，y 鼠标每次点击就重画一次）
               | ----------repaint----------|
 */

window监听

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

public class TestWindow {
    public static void main(String[] args) {
        new WindowFrame();
    }
}


class WindowFrame extends Frame{
    public WindowFrame(){
        setBounds(200,200,200,200);
        setBackground(Color.red);
        setVisible(true);
        //addWindowListener(new MyWindowListener());
        this.addWindowListener(new WindowAdapter() {//匿名内部类
            @Override
            public void windowOpened(WindowEvent e) {
                System.out.println("窗口打开后");//很难监听到
            }

            @Override
            public void windowClosed(WindowEvent e) {
                System.out.println("窗口关闭后");//很难监听到
            }

            @Override
            public void windowActivated(WindowEvent e) {
                System.out.println("窗口被激活时");
            }

            @Override
            public void windowClosing(WindowEvent e) {
                System.out.println("你点击了关闭");
            }
        });
    }

    class MyWindowListener extends WindowAdapter{
        @Override
        public void windowClosing(WindowEvent e) {
            setVisible(false);//隐藏窗口，通过按钮隐藏当前窗口
            System.exit(0);//0正常退出  1是异常退出
        }
    }

}

key监听

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

public class TestKeyListener {
    public static void main(String[] args) {
        new KeyFrame();
    }
}


class KeyFrame extends Frame{
    public KeyFrame(){
        setBounds(1,2,200,200);
        setVisible(true);

        this.addKeyListener(new KeyAdapter() {
            //键盘按下
            @Override
            public void keyPressed(KeyEvent e) {
                //获得键盘下的键是哪一个，当前键盘的码
                int keyCode =e.getKeyCode();
                System.out.println(keyCode);
                if (keyCode==KeyEvent.VK_UP){
                    System.out.println("你按下了上键");
                }
            }
        });
    }
}