Arrays是数组的工具类，为操作数组提供了很多静态方法

常用API

import java.util.Arrays;
import java.util.List;
public class ArraysStudy {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        String[] strs = {"张三","李四","王五","赵六","田七","王八","啤酒"};
        //将数组转换为List集合(不可改变内容)
        List<String> datas = Arrays.asList(strs);
        System.out.println(datas);
//        datas.add("赵六");// 抛出UnsupportedOperationException
//        System.out.println(datas);
        //从数组中检索元素所在的下标（二分查找法）
        System.out.println(Arrays.binarySearch(strs, "李四"));
        //将一个数组复制成一个新的数组
        String[] newArr = Arrays.copyOf(strs, 10);
        //打印输出数组的具体内容
        System.out.println(Arrays.toString(newArr));
        //将某一个数组，按照指定范围进行复制[2 5)
        String[] newArr02 = Arrays.copyOfRange(strs, 2, 5);
        System.out.println(Arrays.toString(newArr02));
        //用来比较2个数组，是否内容相同
        System.out.println(Arrays.equals(newArr, newArr02));
        //将指定数组的所有元素，使用 张老师 进行替换
        Arrays.fill(newArr02, "张老师");
        System.out.println(Arrays.toString(newArr02));
        //对数组进行升序排序(默认)
        Integer[] nums = {12,56,23,12,456,223,12,1243,78};
        Arrays.parallelSort(nums);//Arrays.sort(nums);
        System.out.println(Arrays.toString(nums));
        //自定义排序规则，完成降序排列
        Arrays.parallelSort(nums,new ArrayComparator());
        System.out.println(Arrays.toString(nums));
    }
}