Java Interview Guide : 200+ Interview Questions and Answers - Interface

The video tutorial covers the concept of interfaces in Java, explaining their purpose as a contract for classes to implement specific methods. It discusses how interfaces can define common actions across different classes, using examples like the map and collection interfaces in Java. The tutorial also explains how to define and implement interfaces, including changes introduced in Java 8, such as default method implementations. Advanced topics like extending interfaces and implementing multiple interfaces are also covered, providing a comprehensive understanding of interfaces in Java.

How does Java 1.8 change the way methods can be defined in interfaces?

What are the characteristics of variables defined in an interface?

What is the difference between extending and implementing interfaces in Java?