An example of polymorphism : Polymorphism « Class Definition « Java Tutorial

1. Java Tutorial
2. Class Definition
3. Polymorphism

class Employee {
  public void work() {
    System.out.println("I am an employee.");
  }
}

class Manager extends Employee {
  public void work() {
    System.out.println("I am a manager.");
  }

  public void manage() {
    System.out.println("Managing ...");
  }
}

public class PolymorphismTest1 {
  public static void main(String[] args) {
    Employee employee;
    employee = new Manager();
    System.out.println(employee.getClass().getName());
    employee.work();
    Manager manager = (Manager) employee;
    manager.manage();
  }
}