What are abstract classes in Java OOP?

What are abstract classes in Java OOP?

Abstract classes in Java are classes that cannot be instantiated and can contain abstract methods that must be implemented by subclasses.

Can you give me an example of an abstract class?

Sure! Here's a simple example:

abstract class Animal {
    abstract void sound();
}

class Dog extends Animal {
    void sound() {
        System.out.println("Bark");
    }
}

In this example, Animal is an abstract class with an abstract method sound(), which is implemented in the Dog class.

What is the purpose of using abstract classes?

Abstract classes allow you to define a base class with common behavior while enforcing a contract for subclasses to implement specific methods.

Can abstract classes have constructors?

Yes, abstract classes can have constructors, which can be called when a subclass is instantiated.