TwoSumSolution1.java

import java.util.Arrays;

class TwoSumSolution1{
  static int[] findTwoSumSolution1(int nums[], int target) {
    int length = nums.length;
    for (int i = 0; i < (length - 1); i++) {
      for (int j = (i + 1); j < length; j++) {
        if (nums[i] + nums[j] == target) {
          int result[] = { i, j };
          return result;
        }
      }
    }
    return null;
  }

  public static void main(String [] args) {
    int testCase1nums[] = {5, 7, 12,1};
    int testCase1Target = 12;

    int testCase2nums[] = {3, 5, 0};
    int testCase2Target = 6;

    int testCase3nums[] = {0, 3};
    int testCase3Target = 3;

    int testCase4nums[] = {0, -1, 2, -3, 1};
    int testCase4Target = -2;

    int testCase5nums[] = {4, -11, 22, -23, 31};
    int testCase5Target = -20;
    
    System.out.println(Arrays.toString(findTwoSumSolution1(testCase1nums,testCase1Target)));
    System.out.println(Arrays.toString(findTwoSumSolution1(testCase2nums,testCase2Target)));
    System.out.println(Arrays.toString(findTwoSumSolution1(testCase3nums,testCase3Target)));
    System.out.println(Arrays.toString(findTwoSumSolution1(testCase4nums,testCase4Target)));
    System.out.println(Arrays.toString(findTwoSumSolution1(testCase5nums,testCase5Target)));
  }
}