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Functional Interfaces in Java

Fundamentals and Examples

  • Book
  • © 2019

Overview

Authors:
  1. Ralph Lecessi

    1. Kendall Park, USA

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  • A one of a kind comprehensive and practical guide on Java functional interfaces
  • Includes the latest Java 11, 10 and 9 APIs
  • Presents extensive detail on functional interfaces in the Java APIs and how to utilize them to accomplish many programming tasks

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Table of contents (15 chapters)

  1. Front Matter

    Pages i-xvii
    Download chapter PDF

  2. Functional Interfaces

    • Ralph Lecessi
    Pages 1-27

  3. Lambda Expressions

    • Ralph Lecessi
    Pages 29-43

  4. Predicates

    • Ralph Lecessi
    Pages 45-68

  5. Functions

    • Ralph Lecessi
    Pages 69-93

  6. Operators

    • Ralph Lecessi
    Pages 95-107

  7. Consumers

    • Ralph Lecessi
    Pages 109-129

  8. Suppliers

    • Ralph Lecessi
    Pages 131-150

  9. Use in Traversing Objects

    • Ralph Lecessi
    Pages 151-180

  10. Use in Collections

    • Ralph Lecessi
    Pages 181-207

  11. Use in Comparing Objects

    • Ralph Lecessi
    Pages 209-242

  12. Use in Optionals

    • Ralph Lecessi
    Pages 243-257

  13. Use in Streams

    • Ralph Lecessi
    Pages 259-291

  14. Use in Multithreaded Programs

    • Ralph Lecessi
    Pages 293-327

  15. Use in Atomic Calculations

    • Ralph Lecessi
    Pages 329-346

  16. Use in JavaFX Applications

    • Ralph Lecessi
    Pages 347-390

  17. Back Matter

    Pages 391-410
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Keywords

About this book

Reduce development time by organizing your programs as chains of functional interfaces and see that the advantages of using functional interfaces include the flexibility and power of inlined functional chains and reuse of functional methods utilized throughout the Java API. You’ll see how complex logical expressions can be reduced to chains of predicates and how chains of comparators can be used to sort data by several criteria in order. Other examples include streams that utilize functional interfaces to filter, sort, transform, and perform calculations on data; CompletableFutures that use functional interfaces to create cascading and parallel execution threads; and JavaFX programs that use functional interfaces to monitor the data backed by their graphical components.


Each chapter contains a complete programming project: the Discount Dave project shows you how to qualify car customers by organizing questions as a list of predicates; the Real Estate Broker project shows you how to use chains of comparators to filter and sort homes according to customer priorities; the Dave's Part Inventory project shows you how to query and write reports from an inventory database using stream operations; and the Sentence Builder project shows you how to correct a sentence by implementing each grammar rule as a separate link in a future chain.


Functional Interfaces in Java will help you quickly develop powerful and reliable programs that utilize functional interfaces to implement logic and calculations.




What You Will Learn
  • Use the functional interfaces in the java.util.function package to perform conditional logic, transform and generate data, and perform calculations
  • Filter and sort data by several criteria  using comparators 
  • Process collections and filter, sort, transform, and reduce stream elements with functional interfaces 
  • Write cascading and parallel execution threads



Who This Book Is For


Computer science student or a professional Java programmer. This work is a rigorous discussion of the application of functional interfaces, so prerequisites for this text include basic Java programming and object-oriented Java programming.


Reviews

“The book is well written and the chapters are ordered in a logical way. … this book can be used for self-study and as a professional reference.” (Hector Antonio Villa-Martinez, Computing Reviews, September 27, 2022)

Authors and Affiliations

  • Kendall Park, USA

    Ralph Lecessi

About the author

Ralph Lecessi is a software engineer with over 30 years’ professional programming experience in the aerospace, telecommunications, and payment industries at companies including Lockheed Martin, Alcatel-Lucent, AT&T, and Northrop Grumman. He is currently lead embedded software developer at TranSendIT, Inc in Mount Laurel, New Jersey.


Ralph is also the author of JAVATM - The Beginnings—a text on basic Java programming that includes many examples and diagrams. Ralph is an adjunct professor of programming at Middlesex County College, where he teaches basic and object-oriented programming in Java. He lives in South Brunswick, New Jersey, with his wife and two children.

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