Thread: Small problem regarding inheritance of classes

Hey, just moved onto inheritance in college and was working through our first exercise sheet when I got this problem. For the exercise, we have to write a class encapsulating the notion of an employee, then make a Tradesman class by inheritance from Employee and finally, a class Staff to encapsulate the notion of a group of employees.

I'm having trouble printing out a Tradesman, for example in the following code, when I print the personnel my output should be:

Mike, Sales
Fred, Engineering, Welder

but instead it only prints:

Mike, Sales
Fred, Engineering

                Staff personnel = new Staff();
		Employee e1 = new Employee("Mike","Sales");
		Employee e2 = new Tradesman("Fred","Engineering","Welder");
		personnel.hire(e1); personnel.hire(e2); 
		personnel.put();

Can anyone help? I think the problem could be that I'm not storing a Tradesman correctly into the array in the hire method in class Staff. Any guidance in the right direction will help. Thanks in advance.
Here's the code for the classes so far:

class Employee {
	private String name, department;
 
	Employee(String n, String d) {
		name = n; department = d;
	}
 
	void putEmp() {
		System.out.print(name + ", " + department);
	}
 
	boolean equals(Employee e) {
		return name==e.name &&
			department==e.department;
	}
}
 
class Tradesman extends Employee {
	private String trade;
 
	Tradesman(String n, String d, String t) {
		super(n, d); trade = t;	
	}
 
	void putTrade() {
		putEmp();
		System.out.print(", " + trade);
	}
 
}
 
class Staff {
	private final int numStaff = 100;
	private Employee[] staff = new Employee[numStaff];
	private int count = 0; // num. of staff
 
	void hire(Employee e) {
		staff[count] = e;
		count++;
	}
 
	void put() {
		for(int i=0; i<count; i++) {
			staff[i].putEmp();
			System.out.println();
		}
	}
}
 
class EmployeeTest {
	public static void main(String[] args) {
		Staff personnel = new Staff();
		Employee e1 = new Employee("Mike","Sales");
		Employee e2 = new Tradesman(
						"Fred","Engineering","Welder");
		personnel.hire(e1); personnel.hire(e2); 
		personnel.put();
	}
}

Originally Posted by KevinWorkman

I believe what you want to do is override the putEmp() method.

How do I do that?

Thanks for the help I solved it by making a new print method in class Employee and then overriding it in the subclass Tradesman.

Yea sorry I phrased that wrong.. I rewrote my code and my print method that I overrode was no longer called putEmp(). Basically the same though. Thanks again for the help