java中Arrays的概述

• Arrays：针对数组进行操作的工具类，比如说排序和查找
• public static String toString (int[] a):把数组转成字符串
• public static void sort(int[] a):对数组进行排序
• public static int binarySearch(int[] a,int key)二分查找

package com.manman.cn;

import java.util.Arrays;

public class ArraysDemo {
    public static void main(String[] args) {
        int[] arr={2,3,5,6,8,7,1};
        //public static String toString (int[] a)把数组转成字符串
        System.out.println("排序前："+Arrays.toString(arr));
        //public static void sort(int[] a):对数组进行排序
        Arrays.sort(arr);
        System.out.println("排序后："+Arrays.toString(arr));
        //public static int binarySearch(int[] a,int key)二分查找
        System.out.println("二分查找："+Arrays.binarySearch(arr, 2));
        
    }
}