Core Java, Volume I Fundamentals, 11th Edition

Chapter 6Interfaces, Lambda Expressions, and Inner Classes

In this chapter

• 6.1 Interfaces

• 6.2 Lambda Expressions

• 6.3 Inner Classes

• 6.4 Service Loaders

• 6.5 Proxies

You have now learned about classes and inheritance, the key concepts of object-oriented programming in Java. This chapter shows you several advanced techniques that are commonly used. Despite their less obvious nature, you will need to master them to complete your Java tool chest.

The first technique, called interfaces, is a way of describing what classes should do, without specifying how they should do it. A class can implement one or more interfaces. You can then use objects of these implementing classes whenever conformance to the interface is required. After we cover interfaces, ...