0167 Two Sum II - Input Array Is Sorted

Question

My Solution:

class Solution {
    public int[] twoSum(int[] numbers, int target) {        
        int begin = 0;
        int end = numbers.length - 1;
        while(begin <= end){
            int sum = numbers[begin] + numbers[end];
            if(sum == target)
                return new int[]{begin+1, end+1};
            else if(sum > target)
                end--;
            else 
                begin++;
        }
        
        return null;
    }
}