Question

I am trying to understand how a Map from the Java Collections Framework works. I understand that it maps values to a key, but what if I want to create an employee who has a first name, last name, gender, and an ID (which I would use as the key).

So I tried this code…

Map <Employee> employeeMap = new HashMap<String,String,String,String,int>();

But it doesn’t like this, as it wants only two parameters to be entered. So, how do I add an entire employee to the Map which contains more then two values?

Answer 1

you have an Employee class, don’t you?

class Employee{
Integer id;
String firstname;
String lastname;
...
}

when you have an object of Employee, say “em”
then you can

employeeMap.put(em.getId(), em);