Home > Store

Core Java for the Impatient, 3rd Edition

Register your product to gain access to bonus material or receive a coupon.

Core Java for the Impatient, 3rd Edition

Best Value Purchase

Book + eBook Bundle

  • Your Price: $53.99
  • List Price: $89.98
  • Includes EPUB and PDF
  • About eBook Formats
  • This eBook includes the following formats, accessible from your Account page after purchase:

    ePub EPUB The open industry format known for its reflowable content and usability on supported mobile devices.

    Adobe Reader PDF The popular standard, used most often with the free Acrobat® Reader® software.

    This eBook requires no passwords or activation to read. We customize your eBook by discreetly watermarking it with your name, making it uniquely yours.

More Purchase Options


  • Your Price: $39.99
  • List Price: $49.99
  • Usually ships in 24 hours.

eBook (Watermarked)

  • Your Price: $31.99
  • List Price: $39.99
  • Includes EPUB and PDF
  • About eBook Formats
  • This eBook includes the following formats, accessible from your Account page after purchase:

    ePub EPUB The open industry format known for its reflowable content and usability on supported mobile devices.

    Adobe Reader PDF The popular standard, used most often with the free Acrobat® Reader® software.

    This eBook requires no passwords or activation to read. We customize your eBook by discreetly watermarking it with your name, making it uniquely yours.


  • Copyright 2023
  • Dimensions: 7" x 9-1/8"
  • Pages: 576
  • Edition: 3rd
  • Book
  • ISBN-10: 0-13-805210-7
  • ISBN-13: 978-0-13-805210-2

Clear, Concise Guide to the Core Language and Libraries--Updated through Java 17

Modern Java introduces major enhancements that impact the core Java technologies and APIs at the heart of the Java platform. Many old Java idioms are no longer needed, and new features and programming paradigms can make you far more effective. However, navigating these changes can be challenging.

Core Java for the Impatient, Third Edition, is a complete yet concise guide that reflects all changes through Java SE 17, Oracle's latest Long-Term Support (LTS) release. Written by Cay S. Horstmann--author of the classic two-volume Core Java--this indispensable tutorial offers a faster, easier pathway for learning modern Java.

Horstmann covers everything working developers need to know, including the powerful concepts of lambda expressions and streams, modern constructs such as records and sealed classes, and sophisticated concurrent programming techniques. Given the size and scope of Java 17, there's plenty to cover, but it's presented in small chunks organized for quick access and easy understanding, with plenty of practical insights and sample code to help you quickly apply all that's new.

  • Test code as you create it with JShell
  • Improve your object-oriented design with records and sealed classes
  • Effectively use text blocks, switch expressions, and pattern matching
  • Understand functional programming with lambda expressions
  • Streamline and optimize data management with the Streams API
  • Use modern library features and threadsafe data structures to implement concurrency reliably
  • Work with the modularized Java API and third-party modules
  • Take advantage of API improvements for working with collections, input/output, regular expressions, and processes
  • Learn the APIs for date/time processing and internationalization

Whether you're an experienced developer just getting started with modern Java, or have been programming with Java for years, this guide will help you write more robust, efficient, and secure Java code.

Register your book for convenient access to downloads, updates, and/or corrections as they become available. See inside book for details.


Author's Site

Please visit the author's site at horstmann.com/javaimpatient.

Sample Content

Online Sample Chapter

Processing Input and Output

Sample Pages

Download the sample pages (includes Chapter 9)

Table of Contents

Preface xxiii
Acknowledgments xxv
About the Author xxvii

Chapter 1: Fundamental Programming Structures 1
1.1 Our First Program 2
1.2 Primitive Types 11
1.3 Variables 14
1.4 Arithmetic Operations 17
1.5 Strings 25
1.6 Input and Output 35
1.7 Control Flow 38
1.8 Arrays and Array Lists 46
1.9 Functional Decomposition 56
Exercises 58

Chapter 2: Object-Oriented Programming 61
2.1 Working with Objects 62
2.2 Implementing Classes 67
2.3 Object Construction 71
2.4 Records 76
2.5 Static Variables and Methods 79
2.6 Packages 83
2.7 Nested Classes 90
2.8 Documentation Comments 95
Exercises 100

Chapter 3: Interfaces and Lambda Expressions 105
3.1 Interfaces 106
3.2 Static, Default, and Private Methods 113
3.3 Examples of Interfaces 117
3.4 Lambda Expressions 121
3.5 Method and Constructor References 124
3.6 Processing Lambda Expressions 127
3.7 Lambda Expressions and Variable Scope 131
3.8 Higher-Order Functions 135
3.9 Local and Anonymous Classes 137
Exercises 139

Chapter 4: Inheritance and Reflection 143
4.1 Extending a Class 144
4.2 Inheritance Hierarchies 150
4.3 Object: The Cosmic Superclass 157
4.4 Enumerations 166
4.5 Runtime Type Information and Resources 170
4.6 Reflection 179
Exercises 188

Chapter 5: Exceptions, Assertions, and Logging 191
5.1 Exception Handling 192
5.2 Assertions 204
5.3 Logging 206
Exercises 214

Chapter 6: Generic Programming 219
6.1 Generic Classes 220
6.2 Generic Methods 221
6.3 Type Bounds 222
6.4 Type Variance and Wildcards 223
6.5 Generics in the Java Virtual Machine 228
6.6 Restrictions on Generics 231
6.7 Reflection and Generics 238
Exercises 241

Chapter 7: Collections 247
7.1 An Overview of the Collections Framework 248
7.2 Iterators 252
7.3 Sets 254
7.4 Maps 255
7.5 Other Collections 259
7.6 Views 264
Exercises 267

Chapter 8: Streams 271
8.1 From Iterating to Stream Operations 272
8.2 Stream Creation 273
8.3 The filter, map, and flatMap Methods 276
8.4 Extracting Substreams and Combining Streams 278
8.5 Other Stream Transformations 279
8.6 Simple Reductions 280
8.7 The Optional Type 281
8.8 Collecting Results 286
8.9 Collecting into Maps 287
8.10 Grouping and Partitioning 289
8.11 Downstream Collectors 289
8.12 Reduction Operations 292
8.13 Primitive Type Streams 294
8.14 Parallel Streams 295
Exercises 298

Chapter 9: Processing Input and Output 301
9.1 Input/Output Streams, Readers, and Writers 302
9.2 Paths, Files, and Directories 312
9.3 HTTP Connections 320
9.4 Regular Expressions 323
9.5 Serialization 333
Exercises 344

Chapter 10: Concurrent Programming 347
10.1 Concurrent Tasks 348
10.2 Asynchronous Computations 353
10.3 Thread Safety 360
10.4 Parallel Algorithms 366
10.5 Threadsafe Data Structures 368
10.6 Atomic Counters and Accumulators 373
10.7 Locks and Conditions 375
10.8 Threads 381
10.9 Processes 386
Exercises 390

Chapter 11: Annotations 397
11.1 Using Annotations 398
11.2 Defining Annotations 403
11.3 Standard Annotations 406
11.4 Processing Annotations at Runtime 410
11.5 Source-Level Annotation Processing 413
Exercises 417

Chapter 12: The Date and Time API 421
12.1 The Time Line 422
12.2 Local Dates 424
12.3 Date Adjusters 428
12.4 Local Time 429
12.5 Zoned Time 430
12.6 Formatting and Parsing 433
12.7 Interoperating with Legacy Code 436
Exercises 437

Chapter 13: Internationalization 441
13.1 Locales 442
13.2 Number Formats 447
13.3 Currencies 448
13.4 Date and Time Formatting 449
13.5 Collation and Normalization 451
13.6 Message Formatting 453
13.7 Resource Bundles 455
13.8 Character Encodings 458
13.9 Preferences 459
Exercises 461

Chapter 14: Compiling and Scripting 463
14.1 The Compiler API 463
14.2 The Scripting API 467
Exercises 472

Chapter 15: The Java Platform Module System 475
15.1 The Module Concept 476
15.2 Naming Modules 478
15.3 The Modular Hello, World! Program 478
15.4 Requiring Modules 480
15.5 Exporting Packages 482
15.6 Modules and Reflective Access 485
15.7 Modular JARs 488
15.8 Automatic Modules 489
15.9 The Unnamed Module 491
15.10 Command-Line Flags for Migration 491
15.11 Transitive and Static Requirements 493
15.12 Qualified Exporting and Opening 495
15.13 Service Loading 496
15.14 Tools for Working with Modules 497
Exercises 499

Index 501


Submit Errata

More Information

InformIT Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time.


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information

To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.


Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.


If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@informit.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information

Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.


This site is not directed to children under the age of 13.


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information

If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.


Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

Sale of Personal Information

Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents

California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure

Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact

Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice

We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020