(二)Arrays集合的工具类

package com;

import java.util.Arrays;

/**

 * Arrays 集合的工具类

 *  包含了很多实现好的算法方法

 *  API 好处就是简化代码!

 */

public class Demo04 {

public static void main(String[] args) {

String[] names = {"Tom","Andy","John","Jerry"};

//Arrays.toString() 将数组的元素连接为一个字符串.

String str = Arrays.toString(names);

System.out.println(str); 

//比较两个数组是否相等

char[] answer = {'B','C'};//标准答案

char[] in1 = {'A','B'};

char[] in2 = {'B','C'};

System.out.println(Arrays.equals(answer, in1)); //false

System.out.println(Arrays.equals(answer, in2)); //true

}

}