輸出陣列nums中兩數之和為target的對應下標

package suanfa;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

public class Solution2 {

    public int[] twoSum(int[] nums, int target) {
        Map<Integer, Integer> map = new HashMap<>();
        for (int i = 0; i < nums.length; i++) {
            int complement = target - nums[i];
            if (map.containsKey(complement)) {
                return new int[] { map.get(complement), i };
            }
            map.put(nums[i], i);
        }
        throw new IllegalArgumentException("No two sum solution");
    }
    public static void main(String[] args) {
        int nums[] = {2, 7, 11, 15};
        int target = 9;
        final Solution2 solution2 = new Solution2();
         int[] result = solution2.twoSum(nums,target);
         //輸出陣列nums中兩數之和為target的對應下標
        System.out.println(Arrays.toString(result));
    }
}