How do I create an abstract class in Java?

How do I create an abstract class in Java?

To create an abstract class in Java, use the 'abstract' keyword in the class declaration. For example:

abstract class Animal {
    abstract void makeSound();
}```

Can you give me an example of how to implement this abstract class?

Sure! Here's an example of a subclass that implements the abstract class:

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

What happens if I don't implement the abstract method?

If you don't implement the abstract method in the subclass, the subclass must also be declared abstract, or it will result in a compilation error.

Can an abstract class have concrete methods?

Yes, an abstract class can have both abstract methods and concrete methods (methods with a body). This allows you to provide some default behavior.