和为S的两个数字

import java.util.ArrayList;
public class Solution {
    public ArrayList<Integer> FindNumbersWithSum(int [] array,int sum) {
        int min = 0;
        int max = 0;
        ArrayList<Integer>list = new ArrayList<Integer>();
        if(array.length <=1)return list;
        for(int i = 0;i<array.length;i++){
            
            if(smallandbig(sum,array[i],array[array.length-1])){
                for(int j = i+1;j<array.length;j++){
                    if(array[i]+array[j] == sum){
                        list.add(array[i]);
                        list.add(array[j]);
                        return list;
                    }
                }
            }
            
        }
        return list;
    }
    public static boolean smallandbig(int sum,int a1,int a2){
        if(a1+a2>=sum){
            return true;
        }
        else
            return false;
    }
}