book

Java Cookbook, 4th Edition

Name: Java Cookbook, 4th Edition
Author: Ian F. Darwin
ISBN: 9781492072584

by Ian F. Darwin

March 2020

Intermediate to advanced

638 pages

14h 55m

English

O'Reilly Media, Inc.

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Preface
Who This Book Is ForWhat’s in This Book?Java BooksConventions Used in This BookO’Reilly Online LearningComments and QuestionsAcknowledgments
1. Getting Started: Compiling and Running Java
1.0. Introduction1.1. Compiling and Running Java: Standard JDK1.2. Compiling and Running Java: GraalVM for Better Performance1.3. Compiling, Running, and Testing with an IDE1.4. Exploring Java with JShell1.5. Using CLASSPATH Effectively1.6. Downloading and Using the Code Examples1.7. Automating Dependencies, Compilation, Testing, and Deployment with Apache Maven1.8. Automating Dependencies, Compilation, Testing, and Deployment with Gradle1.9. Dealing with Deprecation Warnings1.10. Maintaining Code Correctness with Unit Testing: JUnit1.11. Maintaining Your Code with Continuous Integration1.12. Getting Readable Stack Traces1.13. Finding More Java Source Code1.14. Finding Runnable Java Libraries
2. Interacting with the Environment
2.0. Introduction2.1. Getting Environment Variables2.2. Getting Information from System Properties2.3. Dealing with Code That Depends on the Java Version or the Operating System2.4. Using Extensions or Other Packaged APIs2.5. Using the Java Modules System
3. Strings and Things
3.0. Introduction3.1. Taking Strings Apart with Substrings or Tokenizing3.2. Putting Strings Together with StringBuilder3.3. Processing a String One Character at a Time3.4. Aligning, Indenting, and Unindenting Strings3.5. Converting Between Unicode Characters and Strings3.6. Reversing a String by Word or by Character3.7. Expanding and Compressing Tabs3.8. Controlling Case3.9. Entering Nonprintable Characters3.10. Trimming Blanks from the End of a String3.11. Creating a Message with I18N Resources3.12. Using a Particular Locale3.13. Creating a Resource Bundle3.14. Program: A Simple Text Formatter3.15. Program: Soundex Name Comparisons
4. Pattern Matching with Regular Expressions
4.0. Introduction4.1. Regular Expression Syntax4.2. Using Regexes in Java: Test for a Pattern4.3. Finding the Matching Text4.4. Replacing the Matched Text4.5. Printing All Occurrences of a Pattern4.6. Printing Lines Containing a Pattern4.7. Controlling Case in Regular Expressions4.8. Matching Accented, or Composite, Characters4.9. Matching Newlines in Text4.10. Program: Apache Logfile Parsing4.11. Program: Full Grep
5. Numbers
5.0. Introduction5.1. Checking Whether a String Is a Valid Number5.2. Converting Numbers to Objects and Vice Versa5.3. Taking a Fraction of an Integer Without Using Floating Point5.4. Working with Floating-Point Numbers5.5. Formatting Numbers5.6. Converting Among Binary, Octal, Decimal, and Hexadecimal5.7. Operating on a Series of Integers5.8. Formatting with Correct Plurals5.9. Generating Random Numbers5.10. Multiplying Matrices5.11. Using Complex Numbers5.12. Handling Very Large Numbers5.13. Program: TempConverter5.14. Program: Number Palindromes
6. Dates and Times
6.0. Introduction6.1. Finding Today’s Date6.2. Formatting Dates and Times6.3. Converting Among Dates/Times, YMDHMS, and Epoch Seconds6.4. Parsing Strings into Dates6.5. Difference Between Two Dates6.6. Adding to or Subtracting from a Date6.7. Handling Recurring Events6.8. Computing Dates Involving Time Zones6.9. Interfacing with Legacy Date and Calendar Classes
7. Structuring Data with Java
7.0. Introduction7.1. Using Arrays for Data Structuring7.2. Resizing an Array7.3. The Collections Framework7.4. Like an Array, but More Dynamic7.5. Using Generic Types in Your Own Class7.6. How Shall I Iterate Thee? Let Me Enumerate the Ways7.7. Eschewing Duplicates with a Set7.8. Structuring Data in a Linked List7.9. Mapping with Hashtable and HashMap7.10. Storing Strings in Properties and Preferences7.11. Sorting a Collection7.12. Avoiding the Urge to Sort7.13. Finding an Object in a Collection7.14. Converting a Collection to an Array7.15. Making Your Data Iterable7.16. Using a Stack of Objects7.17. Multidimensional Structures7.18. Simplifying Data Objects with Lombok or Record7.19. Program: Timing Comparisons
8. Object-Oriented Techniques
8.0. Introduction8.1. Object Methods: Formatting Objects with toString(), Comparing with Equals8.2. Using Inner Classes8.3. Providing Callbacks via Interfaces8.4. Polymorphism/Abstract Methods8.5. Using Typesafe Enumerations8.6. Avoiding NPEs with Optional8.7. Enforcing the Singleton Pattern8.8. Roll Your Own Exceptions8.9. Using Dependency Injection8.10. Program: Plotter
9. Functional Programming Techniques: Functional Interfaces, Streams, and Parallel Collections
9.0. Introduction9.1. Using Lambdas/Closures Instead of Inner Classes9.2. Using Predefined Lambda Interfaces Instead of Your Own9.3. Simplifying Processing with Streams9.4. Simplifying Streams with Collectors9.5. Improving Throughput with Parallel Streams and Collections9.6. Using Existing Code as Functional with Method References9.7. Java Mixins: Mixing in Methods

10. Input and Output: Reading, Writing, and Directory Tricks
10.0. Introduction10.1. About InputStreams/OutputStreams and Readers/Writers10.2. Reading a Text File10.3. Reading from the Standard Input or from the Console/Controlling Terminal10.4. Printing with Formatter and printf10.5. Scanning Input with StreamTokenizer10.6. Scanning Input with the Scanner Class10.7. Scanning Input with Grammatical Structure10.8. Copying a File10.9. Reassigning the Standard Streams10.10. Duplicating a Stream as It Is Written; Reassigning Standard Streams10.11. Reading/Writing a Different Character Set10.12. Those Pesky End-of-Line Characters10.13. Beware Platform-Dependent File Code10.14. Reading/Writing Binary Data10.15. Reading and Writing JAR or ZIP Archives10.16. Finding Files in a Filesystem-Neutral Way with getResource() and getResourceAsStream()10.17. Getting File Information: Files and Path10.18. Creating a New File or Directory10.19. Changing a File’s Name or Other Attributes10.20. Deleting a File10.21. Creating a Transient/Temporary File10.22. Listing a Directory10.23. Getting the Directory Roots10.24. Using the FileWatcher Service to Get Notified About File Changes10.25. Program: Save User Data to Disk10.26. Program: Find—Walking a File Tree
11. Data Science and R
11.1. Machine Learning with Java11.2. Using Data In Apache Spark11.3. Using R Interactively11.4. Comparing/Choosing an R Implementation11.5. Using R from Within a Java App: Renjin11.6. Using Java from Within an R Session11.7. Using FastR, the GraalVM Implementation of R11.8. Using R in a Web App
12. Network Clients
12.0. Introduction12.1. HTTP/REST Web Client12.2. Contacting a Socket Server12.3. Finding and Reporting Network Addresses12.4. Handling Network Errors12.5. Reading and Writing Textual Data12.6. Reading and Writing Binary or Serialized Data12.7. UDP Datagrams12.8. URI, URL, or URN?12.9. Program: TFTP UDP Client12.10. Program: Sockets-Based Chat Client12.11. Program: Simple HTTP Link Checker
13. Server-Side Java
13.0. Introduction13.1. Opening a Server Socket for Business13.2. Finding Network Interfaces13.3. Returning a Response (String or Binary)13.4. Returning Object Information Across a Network Connection13.5. Handling Multiple Clients13.6. Serving the HTTP Protocol13.7. Securing a Web Server with SSL and JSSE13.8. Creating a REST Service with JAX-RS13.9. Network Logging13.10. Setting Up SLF4J13.11. Network Logging with Log4j13.12. Network Logging with java.util.logging
14. Processing JSON Data
14.0. Introduction14.1. Generating JSON Directly14.2. Parsing and Writing JSON with Jackson14.3. Parsing and Writing JSON with org.json14.4. Parsing and Writing JSON with JSON-B14.5. Finding JSON Elements with JSON Pointer
15. Packages and Packaging
15.0. Introduction15.1. Creating a Package15.2. Documenting Classes with Javadoc15.3. Beyond Javadoc: Annotations/Metadata15.4. Preparing a Class as a JavaBean15.5. Archiving with JAR15.6. Running a Program from a JAR15.7. Packaging Web Tier Components into a WAR File15.8. Creating a Smaller Distribution with jlink15.9. Using JPMS to Create a Module
16. Threaded Java
16.0. Introduction16.1. Running Code in a Different Thread16.2. Displaying a Moving Image with Animation16.3. Stopping a Thread16.4. Rendezvous and Timeouts16.5. Synchronizing Threads with the synchronized Keyword16.6. Simplifying Synchronization with Locks16.7. Simplifying Producer/Consumer with the Queue Interface16.8. Optimizing Parallel Processing with Fork/Join16.9. Scheduling Tasks: Future Times, Background Saving in an Editor
17. Reflection, or “A Class Named Class”
17.0. Introduction17.1. Getting a Class Descriptor17.2. Finding and Using Methods and Fields17.3. Accessing Private Methods and Fields via Reflection17.4. Loading and Instantiating a Class Dynamically17.5. Constructing a Class from Scratch with a ClassLoader17.6. Constructing a Class from Scratch with JavaCompiler17.7. Performance Timing17.8. Printing Class Information17.9. Listing Classes in a Package17.10. Using and Defining Annotations17.11. Finding Plug-In-Like Classes via Annotations17.12. Program: CrossRef
18. Using Java with Other Languages
18.0. Introduction18.1. Running an External Program from Java18.2. Running a Program and Capturing Its Output18.3. Calling Other Languages via javax.script18.4. Mixing Languages with GraalVM18.5. Marrying Java and Perl18.6. Calling Other Languages via Native Code18.7. Calling Java from Native Code
Afterword
Java Then and Now
Introduction: Always in Motion the Java IsWhat Was New in Java 8What Was New in Java 9What Was New in Java 10 (March 2018)What Was New in Java 11 (September 2018)What Was New in Java 12 (March 2019)What Is New in Java 13 (September 2019)Looking Ahead
Index
About the Author

Content preview from Java Cookbook, 4th Edition

Appendix A. Java Then and Now

Introduction: Always in Motion the Java Is

Java has always been a moving target for developers and writers. I meet developers in my commercial training programs who are still not aware of some of the features added to ancient Java releases, let alone current ones. This appendix looks at each of the major releases of Java. See Jon Byous’s Sun Microsystems article “Java Technology: The Early Years” for a review of Java’s early history. You can also find a copy at the Paderborn University website.¹

Details on releases prior to Java 8 are considered ancient history and have been moved to my website, https://darwinsys.com/java/ancientHistory.html.

What Was New in Java 8

Java 8 Language Changes

The biggest new feature in the Java 8 language is lambda expressions. After a decade of debate on how to implement them, closures, or lambda expressions, finally arrived with Java 8. This is such a vast topic that it gets an entire chapter in this edition; see Chapter 9.

Annotations can now be placed on structured types.

Default methods in interfaces are now supported, allowing for the addition of functionality without breaking all implementations of the interface.

Java 8 API Changes

Java 8 brings in the new date/time API from JSR-310. This provides a more consistent and sensible set of classes and routines for dealing with time. Chapter 6 has been completely rewritten to use the new API, ending with a recipe showing various conversions between the old and ...

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