Chapter 5

Using Abstract Classes and Interfaces

In This Chapter

arrow Understanding abstract methods and classes

arrow Using basic interfaces

arrow Using interfaces as types

arrow Adding constants to an interface

arrow Inheriting interfaces

arrow Working with callbacks

arrow Using default methods

In this chapter, you find out how to use two similar but subtly distinct features: abstract classes and interfaces. Both let you declare the signatures of the methods and fields that a class implements separately from the class itself. Abstract classes accomplish this by way of inheritance. Interfaces do it without using inheritance, but the effect is similar.

warning.eps This chapter also covers a new feature of Java 1.8 called default methods ...

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