Java打乱数组元素简单代码例子

package com.mohuanan.exercise;

import java.util.Random;

//打乱数组的元素
public class ExerciseDemo05 {
    public static void main(String[] args) {
        int[] arr = {1,2,3,4,5};
        Random r = new Random();

        for (int i = 0; i < arr.length; i++) {
            int randomIndex = r.nextInt(5);
            int temp;//临时变量
            temp = arr[randomIndex];
            arr[randomIndex] = arr[i];
            arr[i] = temp;
        }
        //遍历数组,并输出

        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i]+"");
        }
    }
}

package abc;
 
import java.util.Arrays;
import java.util.Random;
 
//将数组随机打乱（每一次运行都是不一样的数组）
 
public class day12 {
    public static void main(String[] args) {
        int arr[]={1,2,3,4,5},temp;
        Random r=new Random();
        int number=r.nextInt(arr.length);
        for (int i = 0; i < arr.length; i++) {
            temp=arr[i];
            arr[i]=arr[number];
            arr[number]=temp;
        }
        System.out.println("arr="+Arrays.toString(arr));
    }
}