[Java]Class Object, Inheritance

Employee.java

public class Employee
{
    private String name;
    private int age;
    private boolean male;
    private double salary;

    Employee(String name, int age, boolean male, double salary)
    {
        this.name = name;
        this.age = age;
        this.male = male;
        this.salary = salary;
    }

    String displayEmpInfo()
    {
        return ("===" + name + "'s Personal Info===
" +
                "Name: " + name + "
" +
                "Age: " + age + "
" +
                "Male: " + male + "
" +
                "Salary: " + salary + "
");
    }
}

Manager.java

public class Manager extends Employee
{
    private String department;

    Manager(String name, int age, boolean male, double salary, String department)
    {
        super(name, age, male, salary);
        this.department = department;
    }

    String displayEmpInfo()
    {
        return super.displayEmpInfo() + "Department: " + department + "
";
    }
}

Drive.java

import java.util.ArrayList;
public class Drive
{
    public static void main(String[] args)
    {
        Employee empMan1 = new Employee("Jerry", 45, true, 4500);
        Employee empWoman1 = new Employee("Elaine", 40, false, 3500);

        Manager manMan1 = new Manager("George", 50, true, 8000, "Sales");

        ArrayList<Employee> staff = new ArrayList<>();
        staff.add(empMan1);
        staff.add(empWoman1);
        staff.add(manMan1);
        for (int i = 0; i < staff.size(); ++i)
        {
            System.out.println(staff.get(i).displayEmpInfo());
        }
        // for (Employee n: staff)
        // {
        //     System.out.println(n.displayEmpInfo());
        // }
    }
}