When should I use interfaces in Java?

When should I use interfaces in Java?

You should use interfaces in Java when you want to define a contract for classes without enforcing a specific implementation. This allows for flexibility and multiple implementations.

Can you give me an example of an interface in Java?

Sure! Here's a simple example:

interface Animal {
    void makeSound();
}

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

class Cat implements Animal {
    public void makeSound() {
        System.out.println("Meow");
    }
}

What are the benefits of using interfaces?

Benefits include promoting loose coupling, enabling multiple inheritance of type, and allowing for easier testing and maintenance.

Are there any downsides to using interfaces?

Yes, one downside is that they can add complexity to your code, especially if overused. Additionally, they cannot contain any implementation until Java 8 introduced default methods.