Largest Number

Given a list of non negative integers, arrange them such that they form the largest number.

For example, given[3, 30, 34, 5, 9], the largest formed number is9534330.

Note: The result may be very large, so you need to return a string instead of an integer.

分析

理解是什么意思？ Arrays.sort(array, (sA, sB)->(sB + sA).compareTo(sA + sB));

代码

class Solution {
    public String largestNumber(int[] a) {

        // int[] --> String[]
        String[] array = new String[a.length];
        for(int i = 0; i< a.length; i++){
            array[i] = a[i] +"";
        }

        // sort string
        Arrays.sort(array, (sA, sB)->(sB + sA).compareTo(sA + sB));

        // string[] -> result
        String result = String.join("", array);

        return result.charAt(0) =='0' ? "0" :result;    
    }
}