雪花飘落

1.循环变量的初始化；

    int i = 0;

2.循环的条件；

    i < 5;

3.循环变量的改变；

    i++

点击查看代码

##package cn.tedu;

import java.awt.*;
import java.util.Random;
import javax.swing.ImageIcon;
import cn.tedu.jf.SnowPanelSec;

public class SnowPanel extends SnowPanelSec {

    //定义雪花的数量
    int snow = 30;
    //定义雪花的坐标(x,y)
    int[] x = new int[snow];
    int[] y = new int[snow];

    //初始化（给坐标赋值）
    public  void  init() {

        int nextInt = new Random().nextInt(1441);
        //给坐标赋值
        for (int i = 0; i < snow; i++) {
            x[i] = new Random().nextInt(1441);
            y[i] = new Random().nextInt(901);

        }

        //加载图片
//        snowImg = new ImageIcon("Image/老虎.png").getImage();

        int num = new Random().nextInt(5);

        switch (num) {
            case 0:
                snowImg = new ImageIcon("Image/老虎.png").getImage();
                break;

            case 1:
                snowImg = new ImageIcon("Image/冰墩墩.png").getImage();
                break;

            case 2:
                snowImg = new ImageIcon("Image/冰雪.png").getImage();
                break;
            case 3:
                snowImg = new ImageIcon("Image/雪融容.png").getImage();
                break;
            case 4:
                snowImg = new ImageIcon("Image/雪花.png").getImage();
                break;
//            default:
//                System.out.println("输入有误");
        }
        }
        //画雪花
        public void paintImage (Graphics g){
            for (int i = 0; i < snow; i++)
                g.drawImage(snowImg, x[i], y[i], this);
        }
        //让雪花动起来
        public void auto () {
            for (int i = 0; i < snow; i++) {
                x[i] = x[i] + 1;
                y[i] = y[i] + 1;
                if (x[i] > 1441) {
                    x[i] = 0;
                }
                if (y[i] > 901) {
                    y[i] = 0;
                }
            }
        }
        //主程序，程序的入口
        public static void main (String[]args){
            new SnowPanel().start();
        }







}

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