A class that exposes mutable fields will:
Generate immutable instances.
Generate mutable instances.
Generate mutable classes but immutable instances.
Which of the following keywords, used within a constructor, allows us to call other constructors with different arguments defined in our class:
self
constructor
this
An object that cannot change its state after it has been initialized is known as:
A mutable object.
An immutable object.
An interface object.
In Java 9,
java.lang.String
generates:An immutable object.
A mutable object.
An interface object.
If we call the
toUpperCase
method for ajava.lang.String
, the method will:Convert the existing
String
to uppercase characters and change its state.Return a new
String
with the contents of the originalString
converted to uppercase characters.Return a new
String
with the contents of the originalString
.
Java 9 with JShell
By :
Java 9 with JShell
By:
Overview of this book
The release of Java 9 has brought many subtle and not-so-subtle changes to the way in which Java programmers approach their code. The most important ones are definitely the availability of a REPL, known as JShell, which will make experiments and prototyping much more straightforward than the old IDE-based project-led approach. Another, more subtle change can be seen in the module system, which will lead to more modularized, maintainable code. The techniques to take full advantage of object-oriented code, functional programming and the new modularity features in Java 9 form the main subjects of this book.
Each chapter will add to the full picture of Java 9 programming starting out with classes and instances and ending with generics and modularity in Java.
Table of Contents (23 chapters)
Java 9 with JShell
Credits
About the Author
Acknowledgement
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Free Chapter
JShell – A Read-Evaluate-Print-Loop for Java 9
Real-World Objects to UML Diagrams and Java 9 via JShell
Classes and Instances
Encapsulation of Data
Mutable and Immutable Classes
Inheritance, Abstraction, Extension, and Specialization
Members Inheritance and Polymorphism
Contract Programming with Interfaces
Advanced Contract Programming with Interfaces
Maximization of Code Reuse with Generics
Advanced Generics
Object-Oriented, Functional Programming, and Lambda Expressions
Modularity in Java 9
Exercise Answers
Index
Customer Reviews