双指针解法（Java）

    public ArrayList<Integer> FindNumbersWithSum(int [] array,int sum) {
        if(array == null || array.length<=1)return new ArrayList<>();
        int left = 0,right = array.length - 1;
        ArrayList<Integer> list = new ArrayList<>();
        while(left<right){
            int temp = array[left] + array[right];
            if(temp > sum){
                right--;
            }else if(temp <sum){
                left++;
            }else{
                list.add(array[left]);
                list.add(array[right]);
                break;
            }
        }
        return list;
    }