using java

3) Mimic the behavior of a Set (following operations only) using only Arrays. a) int add(Object o) - Adds only if the object is already not present(for simple object types). On successful addition returns the index no of the location where the new object was added. If a duplicate element, 1 should be returned. b) void remove(Object o) - c) showAll0 - prints all elements to console. d) Null values should not be allowed. e) Duplicate elements should not be allowed. f) Write JUnit tests, Coverage should be atleast 70%