java经典算法_034打乱数据顺序

package wzs.arithmetics;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

//打乱数据顺序
public class Test_wzs34
{
    public static void main(String[] args)
    {
        List<Integer> arr = new ArrayList<Integer>();
        for (int i = 1; i <= 10; i++)
        {
            arr.add(i);
        }
        System.out.println("打乱前:");
        for (int i : arr)
        {
            System.out.print(i + " ");
        }
        Collections.shuffle(arr);
        System.out.println("\n打乱后:");
        for (int i : arr)
        {
            System.out.print(i + " ");
        }
    }
}

输出结果:

打乱前:
1 2 3 4 5 6 7 8 9 10 
打乱后:
4 7 9 10 1 5 6 3 2 8