Arrays工具类的使用

package com.atguigu.java;

import java.util.Arrays;

public class ArrayTest {
    public static void main(String[] args){
        
        //1.boolean equals(int[] a,int[] b):判断两个数组是否相等。
        int[] arr1 = {1,2,3,4,8,9,0};
        int[] arr2 = {1,4,3,10,0,9,0};
        String[] arr3 = {"mm","oo","ll"};
        boolean isEquals = Arrays.equals(arr1,arr2);
        System.out.println(isEquals);
        
        //2.String toString(int[] a):输出数组信息。
        System.out.println(Arrays.toString(arr1));

        //3.void fill(int[] a,int val):将指定值填充到数组之中。
        Arrays.fill(arr3,"oo");
        System.out.println(Arrays.toString(arr3));
        Arrays.fill(arr1,10);
        System.out.println(Arrays.toString(arr1));
        
        //4.void sort(int[] a):对数组进行排序。
        Arrays.sort(arr2);
        System.out.println(Arrays.toString(arr2));
        
        //5.int binarySearch(int[] a,int key);二分检索。
        int key = 1;
        int index = Arrays.binarySearch(arr2,key);
        if(index >= 0){
            System.out.println(index);
        }else{
            System.out.println("找不到");
        }
        
    }
        
}