How do I get contains to recognize two objects w/ same data as equal?

I created an EmployeeId class that has an int field called myId. What methods and interfaces should I implement in EmployeeId so the output of the program below will be "Already Have That EmployeeId!" ? I have tried to implement the Comparable interface and the equals and hashCode methods but no luck. Thanks for the help!

Justin

EmployeeId emp1 =new EmployeeId(100);

EmployeeId emp2 =new EmployeeId(100);

Vector<EmployeeId> vec =new Vector<EmployeeId>();

vec.add(emp1);

if(vec.contains(emp2)){

System.out.println("Already Have That EmployeeId!");

}else{

System.out.println("Does Not Contain That EmployeeId!");

}

[1017 byte] By [jphilli9a] at [2007-11-26 17:42:27]