More Java 17: An In-Depth Exploration of the Java Language and Its Features

© Kishori Sharan, Peter Späth 2021

K. Sharan, P. SpäthMore Java 17 https://doi.org/10.1007/978-1-4842-7135-3_3

3. Generics

Kishori Sharan¹   and Peter Späth²

(1)

Montgomery, AL, USA

(2)

Leipzig, Sachsen, Germany

 

In this chapter, you will learn:

• What generics are

• How to define generic types, methods, and constructors

• How to define bounds for type parameters

• How to use wildcards as the actual type parameters

• How the compiler infers the actual type parameters for generic type uses

• Generics and their limitations in array creations

• How the incorrect use of generics may lead to heap pollution

All example programs in this chapter are a member of a jdojo.generics module, as declared in Listing 3-1.

// module-info.java

module jdojo.generics {

    exports com.jdojo.generics; ...