leetcode之Two Sum

The function twoSum should return indices of the two numbers such that they add up to the target, where index1 must be less than index2. Please note that your returned answers (both index1 and index2) are not zero-based.

You may assume that each input would have exactly one solution.

Input: numbers={2, 7, 11, 15}, target=9
Output: index1=1, index2=2

中文理解：给你一个数组，和一个目标值，数组里面任意2个元素的值之和等于目标值，然后返回这2个元素的下标，下标从一开始，不是0开始，上面的结果index1=1,index2=2就知道了

public class Solution {
    public int[] twoSum(int[] nums, int target) {
            int index1=0;
            int index2=1;
            for(int i=0;i<nums.length;i++){
                for(int j=i+1;j<nums.length;j++){
                    if(nums[i]+nums[j]==target){
                        index1=i+1;
                        index2=j+1;
                    }
                }
            }
            int[] a=new int[2];
            a[0]=index1;
            a[1]=index2;
            return a;
    }
}