Find value's indexes which each number's sum is same "sum" parameter value

twoSum.java

 static void twoSumValue(int[] nums, int sum) {
        HashMap<Integer, Integer> map = new HashMap<Integer, Integer>();
        for(int i=0; i<nums.length; i++){
            int target = sum - num[i];
            if(map.containsKey(target)){
                System.out.println((map.get(target)+" "+(i)));
                break;
            }
            map.put(cost[i],i);
        }
    }

Ex)
nums = [1,4,5,3,2]
sum = 4
answer : index 0 and 3 (each value are 1 and 3) values (index0 + index3 = 1+3 = 4 =sum)

*nums can have same values. for example, nums = [1,4,1,3]. In this case, return lowest index value.