class Employee {
	private String id; private String name; private double salary;
	public String toString() { return id + " " + name + " " + salary; }
	public Employee(String i, String n, double s) { id = i; name = n; salary = s; }
}

class Manager extends Employee {
	private double bonus;
	public String toString() { return super.toString() + " " + bonus; }
	public double getBonus() { return bonus; }
	public Manager(String i, String n, double s, double b) { super(i, n, s); bonus = b; }
}

class Main {
	public static void main(String[] args) {
		Manager m1 = new Manager("902", "Brian", 1000, 10);   

		Employee e1 = m1; //upcasting
		
		Manager m;
		m = (Manager)e1; //downcasting
		System.out.println(m.getBonus()); 
	}
}
/*
class Main {
	public static void main(String[] args) {

    }
}
*/


/*
		Manager m1 = new Manager("902", "Brian", 1000, 10);   

		Employee e1 = m1; //upcasting
		
		Manager m;
		m = (Manager)e1; //downcasting
		System.out.println(m.getBonus()); 
*/

/*
	public static void main(String[] args)	{
		Employee e1 = new Employee("001", "Alice", 1000);
		Manager m1 = new Manager("902", "Brian", 1000, 10);   
		show_info(m1);
	}

    private static void show_info(Employee x) {
		// some other details

		System.out.println(((Manager) x).getBonus());
    }
*/

/*
		Employee[] allEmployees = new Employee[3];
		allEmployees[0] = new Employee("001", "Alice", 1000);
		allEmployees[1] = new Manager("902", "Brian", 1000, 10);
		allEmployees[2] = new Manager("904", "Daisy", 1000, 15);

		for (Employee e : allEmployees) {
			Manager m = (Manager) e;
			System.out.println(m.getBonus()); // work only if e is really a manager; otherwise runtime error
		}

*/

/*			if (e instanceof Manager) {
				Manager m = (Manager) e;
				System.out.println(m.getBonus()); // work only if e is really a manager; otherwise runtime error
			}		
*/

/*
		Manager m1 = new Manager("902", "Brian", 1000, 10); 
        System.out.println(m1 instanceof Employee);
        System.out.println(m1 instanceof Manager);			
*/