awt frame

package com.law.frame;

import java.awt.Color;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.net.URL;

public class MyWindow extends Frame{

    /**
     * 
     */
    private static final long serialVersionUID = 2490169038285678148L;
    
    private int x;
    private int y;
    private boolean flag;
    

    public MyWindow(){
        
    }
    public MyWindow(String title){
        super(title);
    }

    public void openMyWindow(){
        setBackground(new Color(0, 0, 0));
        setSize(500, 500);
        setLocation(250, 250);
        setVisible(true);
        this.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e){
                System.exit(0);
                }
        });
        new RepaintThread().start();
    }
    


    @Override
    public void paint(Graphics g) {
        g.setColor(Color.white);
        Font font = new Font("Candara", Font.BOLD, 30);
        g.setFont(font);
        g.drawString("Java        Concurrency", 130, 150);
        URL u = this.getClass().getClassLoader().getResource("images/Plane_32px_1194817_easyicon.net.png");
        Image img = Common.loadPic(u);
        g.drawImage(img, x, 350, null);
    }
    
    class RepaintThread extends Thread{

        @Override
        public void run() {
            while(true){
                changePositionX();
                repaint();
                try {
                    Thread.sleep(60);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
        
    }
    public void changePositionX(){
        if(x>=500-32){
            flag = false;
        }
        if(x<=0){
            flag = true;
        }
        if(flag){
            x += 5;
        }else{
            x -= 5;
        }
    }
    public void changePositionY(){
        if(y>=500-32){
            flag = false;
        }
        if(y<=0){
            flag = true;
        }
        if(flag){
            y += 5;
        }else{
            y -= 5;
        }
    }
    public static void main(String[] args) {
        MyWindow window = new MyWindow("open open");
        window.openMyWindow();
    }
    
    public int getX() {
        return x;
    }
    public void setX(int x) {
        this.x = x;
    }
    public int getY() {
        return y;
    }
    public void setY(int y) {
        this.y = y;
    }
    public boolean isFlag() {
        return flag;
    }
    public void setFlag(boolean flag) {
        this.flag = flag;
    }
    
}

加载图片的工具类：

package com.law.frame;

import java.awt.Image;
import java.io.IOException;
import java.net.URL;

import javax.imageio.ImageIO;


public class Common {
    
    
    public static Image loadPic(URL u){
        Image img = null;
        try {
            img = ImageIO.read(u);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return img;
    }
}