Polymorphism Demo in Java: Explanation & Practice

Problem summary

Create Animal array with Dog and Cat objects, each with unique sound.

Starter code

// Animal with abstract sound()
// Dog: sound() prints "Woof"
// Cat: sound() prints "Meow"

public class Main {
    public static void main(String[] args) {
        // Create Animal array with Dog and Cat
        // Loop and call sound() on each
    }
}

Expected output and test cases

• Polymorphic sounds

  Woof
  Meow

Hints

1. Parent reference can hold child objects
2. Actual method called depends on object type
3. This is runtime polymorphism

Related Inheritance exercises

• Practice Abstract Classes in Java
• Practice Implementing Interface in Java
• Practice Employee Hierarchy in Java

Practice all Inheritance exercises · Run this idea in the Java compiler