剑指offer—和为s的两个数字

import java.util.ArrayList;
public class Solution {
public ArrayList<Integer> FindNumbersWithSum(int [] array,int sum) {
ArrayList<Integer> res = new ArrayList<Integer>();
if(array==null || array.length<=0) return res;
int index1 = 0;
int index2 = array.length-1;
while(index1<index2){
if(array[index1]+array[index2]==sum){
res.add(array[index1]);
res.add(array[index2]);
break;
}else if(array[index1]+array[index2]<sum){
index1++;
}else{
index2--;
}
}
return res;
}
}