Verify there is a combination of unique string

Question

class Details{
 String name;
 String age;
 String email;
 String location;
}

1) If there is List of Details as in List

how

Answer 1

Besides of using a hash as propposed by @OmG, you could also use a TreeSet with the key being a concatenation of the unique fields, also using a separator between them.

A Set only admits unique keys.