利用java的API对数组中的数字组合进行排序

java 代码

class Solution {
    public String printMinNumber(int[] nums) {
        IntStream stream = Arrays.stream(nums);
        Stream<Integer> integerStream = stream.boxed();
        Integer[] integers = integerStream.toArray(Integer[]::new);
        return mysort(integers);
    }

    private String mysort(Integer[] arr)
    {
        Arrays.sort(arr, new Comparator<Integer>(){
           public int compare(Integer a1, Integer a2) 
           {
               String s1 = a1 + "" + a2;
               String s2 = a2 + "" + a1;
               return s1.compareTo(s2);
           }
        });

        StringBuilder sb = new StringBuilder();
        for(int i = 0 ; i < arr.length; i++) sb.append(arr[i]);
        return sb.toString();
    }
}