How To Find Array Triplets With Sum Of Two Elements Equals Third?

Technical Round Interview Question ====================================
How To Find Array Triplets With Sum Of Two Elements Equals Third? ====================================
Write a Java program or function to find array triplets with sum of two elements equals third element. For example, [21, 13, 47, 61, 34, 40, 55, 71, 87] is an input array then array triplets with sum of first two elements equals to third element are,

[21, 13, 34]
[21, 40, 61]
[21, 34, 55]
[13, 34, 47]
[47, 40, 87]

See the solution with explanation at https://javaconceptoftheday.com/find-array-triplets-with-sum-of-two-elements-equals-third/