import java.util.HashMap;
public class Employee {
private String name;

public Employee(String name)
{
this.name = name;
}
}

class EmployeeClass
{
public static void main(String args[])
{
HashMap<Employee,String> hm=new HashMap<Employee,String>();
hm.put(new Employee(“a”),”emp1″);
hm.put(new Employee(“b”),”emp2″);
hm.put(new Employee(“a”),”emp1 overridden”);

System.out.println(hm.size());
System.out.println(hm.get(new Employee(“a”)));
}

}