Beginning Java 17 Fundamentals: Object-Oriented Programming in Java 17

© Kishori Sharan and Adam L. Davis 2022

K. Sharan, A. L. DavisBeginning Java 17 Fundamentalshttps://doi.org/10.1007/978-1-4842-7307-4_12

12. Wrapper Classes

Kishori Sharan¹   and Adam L. Davis²

(1)

Montgomery, AL, USA

(2)

Oviedo, FL, USA

 

In this chapter, you will learn:

• The wrapper classes in Java and how to use them

• How to get primitive values from strings

• How primitive values are automatically boxed into wrapper objects when needed

• How wrapper objects are automatically unboxed into primitive values when needed

All classes in this chapter are a member of a jdojo.wrapper module, as declared in Listing 12-1.

// module-info.java

module jdojo.wrapper {

    exports com.jdojo.wrapper;

}

Listing 12-1

The Declaration of a jdojo.wrapper Module

Wrapper Classes

In previous ...