数组工具

package com.ten;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.Array;
import java.util.Arrays;
import java.util.Scanner;


/**
 * @author WangYH
 * @version 2021.1.3
 * @date 2023/4/3 23:24
 */

public class Main {
   
    public static void main(String[] args) {
   

        int[] arr = new int[] {
   4,5,7,8,1,2,4,5,7,4,3,6};
        //超级工具类，打印数组
        System.out.println(Arrays.toString(arr));

        //排序数组
        Arrays.sort(arr);
        System.out.println(Arrays.toString(arr));

        //填充数字
        Arrays.fill(arr,7);
        System.out.println(Arrays.toString(arr));

        //拷贝数组
        int[] arr2 = Arrays.copyOf(arr, arr.length);
        System.out.println(Arrays.toString(arr2));

        //拷贝数组到其他数组
        int[] arr3 = new int[10];
        System.arraycopy(arr,0,arr3,5,2);
        System.out.println(Arrays.toString(arr3));

        //二分快速查找
        System.out.println(Arrays.binarySearch(arr, 7));


        int[][] arr4 = new int[][] {
   {
   1, 2, 3}, {
   4, 5, 6}, {
   7, 8, 9}};
        //二维数组快速打印
        System.out.println(Arrays.deepToString(arr4));

        //判断两个数组相等,只对一维数组有效
        int[] a = new int[] {
   1, 2, 3};
        int[] b = new int[] {
   1, 2, 3};
        System.out.println(Arrays.equals(a, b));
    }

}