Interfaces and Abstract Classes

Overview

Interfaces and abstract classes define methods that must be implemented by subclasses.

Topics

• Defining Interfaces
• Implementing Interfaces
• Abstract Classes
• Differences Between Interfaces and Abstract Classes

Examples

interface Animal {
    void sound();
}

class Dog implements Animal {
    public void sound() {
        System.out.println("Dog barks");
    }
}

abstract class Vehicle {
    abstract void start();
}

class Car extends Vehicle {
    void start() {
        System.out.println("Car starts");
    }
}

Tags

#java #interfaces #abstractclasses #oop #implementation