Java从零开始学10(Arrays类对数组的常用方法)

package com.pb.demo1;

import java.util.Arrays;

/*
 * Arrays工具类的中的几个常用方法
 * 1.copyof
 * 2.toString
 * 3.equals
 * 4.sort
 * 5.fill
 * 6.binarySearch
 */
public class ArraysTest {

    public static void main(String[] args) {
        String [] arry1={"北京","上海","重庆","深圳"};
        String [] arry2=Arrays.copyOf(arry1, 4);
        //复制copyof
        System.out.println("arry2是:"+Arrays.toString(arry2));
        //比较 equals
        System.out.println("arry1与arry2是否相等:"+Arrays.equals(arry1, arry2));
        //将arry1排序 sort
        Arrays.sort(arry1);
        //toString
        System.out.println("排序后的arry1的值:"+Arrays.toString(arry1));
        //排序后arry1与arry2是否还相等 equals
        System.out.println("排序后arry1与arry2是否还相等"+Arrays.equals(arry1, arry2));
        //填充 fill
        Arrays.fill(arry2, "广州");
        System.out.println("填充之后arry2的值:"+Arrays.toString(arry2));
        //查询binarySearch前提是数组已经排序过后才可以使用
        System.out.println("重庆在arry1中的位置:"+Arrays.binarySearch(arry1, "重庆"));

    }

}