How do I use interfaces in Java?
In Java, an interface is a reference type, similar to a class, that can contain only constants, method signatures, default methods, static methods, and nested types. To use an interface, you define it using the interface
keyword.
Can you give me an example of an interface?
Sure! Here's a simple example:
interface Animal {
void makeSound();
}
class Dog implements Animal {
public void makeSound() {
System.out.println("Woof!");
}
}
In this example, Animal
is an interface with a method makeSound
, and Dog
is a class that implements this interface.
What happens if a class doesn't implement all interface methods?
If a class does not implement all the methods of an interface, it must be declared as an abstract class. Otherwise, it will result in a compilation error.
Can an interface extend another interface?
Yes, an interface can extend another interface. This allows you to create a hierarchy of interfaces, enabling more complex designs.
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