Ace the AP Computer Science Exam for High Schoolers/

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Polymorphism in Action

Polymorphism in Action

Understand the relationship between a superclass and a subclass.

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References using inheritance hierarchies

Superclass referenced as the superclass

The first case is pretty simple. When we instantiate a superclass object and store it in a variable of the superclass’s type, Java will call the method of the superclass.

Look at the code below.

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Animal.java
Dog.java
TestDriver.java
public class TestDriver
{
    public static void main(String args[])
    {
        Animal obj = new Animal(4, "brown");    // Creating a dog
        // Calling the functions
        obj.eat();
        obj.sleep();
    }
}

Look at line 5 in the TestDriver.java ...