package com.wuming.struct;import java.util.Arrays;public class Demo14 {public static void main(String[] args) {//Arrays数组类，操作数组：排序、搜索等int[] a={1,2,3,4,9090,31231,543,21,3,23};System.out.println("======System.out.println(a);=======1=======");System.out.println(a);//打印数组元素Arrays.toStringSystem.out.println("============ System.out.println(Arrays.toString(a));=======2======");System.out.println(Arrays.toString(a));System.out.println("===========printArray(a);======3=======");printArray(a);//数组排序Arrays.sort(a);System.out.println("=======System.out.println(Arrays.toString(a));======4=====");System.out.println(Arrays.toString(a));/*  Arrays.fill(a,0);//数组填充System.out.println("=======System.out.println(Arrays.toString(a));=====5======");System.out.println(Arrays.toString(a));*/Arrays.fill(a,2,4,0);//下标为2到4之间的用0填充，[2,4),就是下标为2,3的System.out.println("=======System.out.println(Arrays.toString(a));=====6======");System.out.println(Arrays.toString(a));}public static void printArray(int[] a) {for (int i = 0; i < a.length; i++) {if (i==0){System.out.print("[");}if (i==a.length-1){System.out.print(a[i]+"]");}else{System.out.print(a[i]+", ");}}}
}

======System.out.println(a);=======1=======
[I@4554617c
============ System.out.println(Arrays.toString(a));=======2======
[1, 2, 3, 4, 9090, 31231, 543, 21, 3, 23]
===========printArray(a);======3=======
[1, 2, 3, 4, 9090, 31231, 543, 21, 3, 23]=======System.out.println(Arrays.toString(a));======4=====
[1, 2, 3, 3, 4, 21, 23, 543, 9090, 31231]
=======System.out.println(Arrays.toString(a));=====6======
[1, 2, 0, 0, 4, 21, 23, 543, 9090, 31231]