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_4

4. Lambda Expressions

Kishori Sharan¹   and Peter Späth²

(1)

Montgomery, AL, USA

(2)

Leipzig, Sachsen, Germany

 

In this chapter, you will learn:

• What lambda expressions are

• Why we need lambda expressions

• The syntax for defining lambda expressions

• Target typing for lambda expressions

• Commonly used built-in functional interfaces

• Method and constructor references

• Lexical scoping of lambda expressions

All example programs in this chapter are a member of a jdojo.lambda module , as declared in Listing 4-1.

// module-info.java

module jdojo.lambda {

    exports com.jdojo.lambda;

}

Listing 4-1

The Declaration of a jdojo.lambda Module

What Is a Lambda Expression?

A lambda ...