java编写界面练习:实现气球的自动移动

代码:

import java.awt.Point;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Demo8 extends JFrame{

	//本实例使用多线程同时控制多个JLable组件的移动，其中每个JLabel组件都设置了
	//图标对象为气球图片，当气球移除窗体时，会重新出现在窗体底部继续移动
	
	//注意:添加背景的要在添加小图片之后。
	private ImageIcon[] img = new ImageIcon[3];
	private static JLabel[] imgLabel = new JLabel[3];
	public Demo8(){
		setTitle("实现气球的移动");
		setBounds(100, 100, 550, 600);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		getContentPane().setLayout(null);
		ImageIcon background = new ImageIcon(getClass().getResource("background.jpg"));
		JLabel label = new JLabel(background);
		label.setSize(background.getIconWidth(), background.getIconHeight());
		label.setLocation(0, 0);
		
		img[0] = new ImageIcon(getClass().getResource("balloon1.png"));
		img[1] = new ImageIcon(getClass().getResource("balloon2.png"));
		img[2] = new ImageIcon(getClass().getResource("balloon3.png"));
		
		imgLabel[0] = new JLabel(img[0]);
		imgLabel[0].setSize(img[0].getIconWidth(), img[0].getIconHeight());
//		imgLabel[0].setLocation(20, 300);
		getContentPane().add(imgLabel[0]);
		
		imgLabel[1] = new JLabel(img[1]);
		imgLabel[1].setSize(img[1].getIconWidth(),img[1].getIconHeight());
//		imgLabel[1].setBounds(250, 250, 80, 181);
		getContentPane().add(imgLabel[1]);
		
		imgLabel[2] = new JLabel(img[2]);
		imgLabel[2].setSize(img[2].getIconWidth(),img[2].getIconHeight());
//		imgLabel[2].setBounds(400, 450, 100, 147);
		getContentPane().add(imgLabel[2]);
		
		getContentPane().add(label);//为什么了?一定添加在他们的后边
	}
	
	public static class thread_1 extends JFrame implements Runnable{

		@Override
		public void run() {
			while(true){
				for(int i=300;i>0;i-=15){
					imgLabel[0].setLocation(20, i);
					try {
						Thread.sleep(300);
					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
			}
		}
	}
	public static class thread_2 extends JFrame implements Runnable{

		@Override
		public void run() {
			while(true){
				for(int i=250;i>0;i-=15){
					imgLabel[1].setLocation(250, i);
					try {
						Thread.sleep(300);
					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
			}
		}
	}
	public static class thread_3 extends JFrame implements Runnable{

		@Override
		public void run() {
			while(true){
				for(int i=450;i>0;i-=15){
					imgLabel[2].setLocation(400, i);
					try {
						Thread.sleep(300);
					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
			}
		}
	}
	public static void main(String[] args) {
		Demo8 demo = new Demo8();
		demo.setVisible(true);
		Thread thread_1 = new Thread(new thread_1());
		thread_1.start();
		Thread thread_2 = new Thread(new thread_2());
		thread_2.start();
		Thread thread_3 = new Thread(new thread_3());
		thread_3.start();
	}
}