Learn Java from Scratch - A Beginner's Guide - Step 18 - Java Interface - Puzzles - Unimplemented methods, Abstract Clas

The video tutorial covers various aspects of Java interfaces, including how interfaces can extend other interfaces and the requirements for implementing them in classes. It explains the use of abstract classes to partially implement interfaces and the role of constants within interfaces. The tutorial also introduces default methods in interfaces, a feature available from Java 8, which allows providing default implementations to prevent compilation errors when extending interfaces. The video concludes with practical examples and scenarios where these concepts are applied.

Can an interface extend another interface? Explain your answer.

What must a class do if it implements an interface that extends another interface?

How can you implement only one method of an interface in Java?

What is the significance of default methods in interfaces introduced in Java 8?

What happens when a new method is added to an interface that already has implementing classes?

Why is it important to provide default implementations in interfaces?

Explain the concept of abstract classes in relation to interfaces.