3Sum Closest Java

Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exactly one solution.

    For example, given array S = {-1 2 1 -4}, and target = 1.    The sum that is closest to the target is 2. (-1 + 2 + 1 = 2).

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  Solution: Time O(n^2)
    same idea as 3 Sum
    find minimum difference: abs(sum-target)

public int threeSumClosest(int[] num, int target) {        Arrays.sort(num);        int min=Integer.MAX_VALUE;        int result=0;        int len=num.length;        for(int i=0;i<len-2;i++){              int start=i+1;              int end=len-1;            while(start<end){                int sum=num[i]+num[start]+num[end];                int diff=Math.abs(sum-target);                if(diff<min){                    min=diff;                    result=sum;                    System.out.println(min);                    //start++;                    //end--;                }else if(target>sum){                    start++;                }else{                    end--;                }            }        }        return result;    }