java随机打乱数组顺序

import java.util.Random; 

public class RandomSort { 

    private Random random = new Random(); 

    //数组大小 

    private static final int SIZE = 10; 

    //要重排序的数组 

    private int[] positions = new int[SIZE]; 

    public RandomSort() { 

        for(int index=0; index<SIZE; index++) { 

            //初始化数组，以下标为元素值 

            positions[index] = index; 

        } 

        //顺序打印出数组的值 

        printPositions();

    } 

    //重排序 

    public void changePosition() { 

        for(int index=SIZE-1; index>=0; index--) { 

            //从0到index处之间随机取一个值，跟index处的元素交换 

            exchange(random.nextInt(index+1), index); 

        } 

        printPositions(); 

    } 

    //交换位置 

    private void exchange(int p1, int p2) { 

        int temp = positions[p1]; 

        positions[p1] = positions[p2]; 

        positions[p2] = temp;  //更好位置

    } 

    //打印数组的值 

    private void printPositions() { 

        for(int index=0; index<SIZE; index++) { 

            System.out.print(positions[index]+" ");          

        } 

        System.out.println(); 

    } 

    public static void main(String[] args) { 

        RandomSort rs = new RandomSort(); 

        rs.changePosition(); 

        rs.changePosition(); 

        rs.changePosition(); 

    } 

}