I am able to insert duplicate entries in TreeSet. How to overcome this

Question

I have a class called Employee which has employeeName and employeeId as its member variables.I am creating new Employee objects and then adding it

Answer 1

The way you are comparing string is wrong. See How to compare 2 Strings in Java

(Employee)emp).employeeName== this.employeeName

should be

(Employee)emp).employeeName.equals(this.employeeName)