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Java 8 in Action
book

Java 8 in Action

by Mario Fusco, Alan Mycroft, Raoul-Gabriel Urma
August 2014
Intermediate to advanced content levelIntermediate to advanced
424 pages
13h 50m
English
Manning Publications
Content preview from Java 8 in Action

Chapter 9. Default methods

This chapter covers

  • What default methods are
  • Evolving APIs in a compatible way
  • Usage patterns for default methods
  • Resolution rules

Traditionally, a Java interface groups related methods together into a contract. Any class that implements an interface must provide an implementation for each method defined by the interface or inherit the implementation from a superclass. But this causes a problem when library designers need to update an interface to add a new method. Indeed, existing concrete classes (which may not be under their control) need to be modified to reflect the new interface contract. This is particularly problematic because the Java 8 API introduces many new methods on existing interfaces, such as ...

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Publisher Resources

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