画笔Paint及模拟画图工具

package 狂神说__Paint;

import java.awt.*;

public class TestPaint {
    public static void main(String[] args) {
            new MyPaint().loadFrame();
    }
}
class MyPaint extends Frame{
    public void loadFrame(){
        setBounds(200,200,600,400);
        setVisible(true);
    }
    public void paint(Graphics g){
        super.paint(g);
        g.setColor(Color.blue);
        //g.drawOval(100,100,100,100);
        g.drawOval(100,100,100,100);
        g.setColor(Color.black);
        g.drawOval(200,100,100,100);
        g.setColor(Color.red);
        g.drawOval(300,100,100,100);
        g.setColor(Color.yellow);
        g.drawOval(150,150,100,100);
        g.setColor(Color.green);
        g.drawOval(250,150,100,100);
    }
}

package 狂神说__Paint;

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

public class TestMouseListener {
    public static void main(String[] args) {
        new MyFrame("画图");
    }
}
class MyFrame extends Frame{
    //画笔，需要集合存储点
    ArrayList points;//动态数组存储点
    public MyFrame(String title){
        super(title);
        setBounds(200,200,400,300);
        //存储鼠标的点
        points=new ArrayList<>();
        //鼠标监听器
        this.addMouseListener(new MyMouseListener());
        setVisible(true);
    }
    public void paint(Graphics g){
        //监听鼠标事件
        Iterator iterator=points.iterator();
        while(iterator.hasNext()){
            Point point=(Point)iterator.next();
            g.setColor(Color.blue);
            g.fillOval(point.x,point.y,10,10);
        }
    }
    //添加点到界面上
public void addPaint(Point point){
    points.add(point);
}
    //适配器模式
    private class MyMouseListener extends MouseAdapter{
            //鼠标点击
        public void mousePressed(MouseEvent e){
            MyFrame myFrame=(MyFrame)e.getSource();
            //点击鼠标时会出现一个点
            myFrame.addPaint(new Point(e.getX(),e.getY()));
            //每次点击鼠标都需要重新画一次
            myFrame.repaint();//刷新
        }
    }
}

package 狂神说__Paint;
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(1,2,300,400);
        setVisible(true);
        this.addKeyListener(new KeyAdapter() {
           //键盘按下出现的事件
            @Override
            public void keyPressed(KeyEvent e) {
               //键盘按键
                int keyCode=e.getKeyCode();
                if(keyCode==KeyEvent.VK_UP){
                    System.out.println("按下了上键");
                }
                else if(keyCode==KeyEvent.VK_DOWN){
                    System.out.println("按下了下键");
                }
                else if(keyCode==KeyEvent.VK_LEFT){
                    System.out.println("按下了左键");
                }
                else if(keyCode==KeyEvent.VK_RIGHT){
                    System.out.println("按下了右键");
                }
                else{
                    System.out.println("按下了其他键");
                }
            }
        });
    }
}