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

If you need to achieve unique values-only, you should use Set. You have to use your own equals & hashCode implementation, for example, for case 1):

@Override
public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;
    Details details = (Details) o;
    return Objects.equals(name, details.name) &&
            Objects.equals(email, details.email);
}

@Override
public int hashCode() {

    return Objects.hash(name, email);
}

If you need all Details members to be unique just update hash & equals implementation with needed properties.