数组工具类Arrays

public static String toString(数组)

public static void sort(数组)

import java.util.Arrays;
public class ArraysMethod {
    public static void main(String[] args){
        int[] arr = {1,9,9,9,0,1,2,3};
        Arrays.sort(arr);
        System.out.println(Arrays.toString(arr));
        String[] arr2 = {"aaa","xxx","ddd"};
        Arrays.sort(arr2);
        System.out.println(Arrays.toString(arr2));
    }
}

输出为

[0, 1, 1, 2, 3, 9, 9, 9]
[aaa, ddd, xxx]