Arrays 类的一些常见用法

package cn.ljs;

import java.util.Arrays;

public class ArrayDemo {

    public static void main(String [] args){

        int [] arr1 = {1,2,3};
        int [] arr2 = {1,434,34,2,3};
        System.out.println(Arrays.equals(arr1,arr2));   // 简单说比较两数组形状相同不

        
        System.out.println(Arrays.toString(arr1));   //  toString 

        Arrays.sort(arr2);
        System.out.println(Arrays.toString(arr2));

        Arrays.fill(arr1,-1);    // 填充-1
        System.out.println(Arrays.toString(arr1));

        int index = Arrays.binarySearch(arr2,3);   // 排序
        System.out.println(index);

        int [] b = Arrays.copyOf(arr1, arr1.length);   //copy 数组
        System.out.println(arr1 == b);
    }
}