Java 17 Recipes: A problem-solution approach

Table of Contents
About the Authors
About the Technical Reviewer
Introduction
Chapter 1: Getting Started with Java 17
	1-1. Installing Java
		Problem
		Solution
		How It Works
	1-2. Configuring the PATH
		Problem
		Solution
		How It Works
	1-3. Testing Java
		Problem
		Solution
		How It Works
			The Main Program
	1-4. Installing Eclipse
		Problem
		Solution
		How It Works
	1-5. Getting to “Hello, World”
		Problem
		Solution
		How It Works
			Packages
			JavaBeans-style Classes
			The Main Program
	1-6. Configuring the CLASSPATH
		Problem
		Solution
		How It Works
	1-7. Organizing Code with Packages
		Problem
		Solution
		How It Works
	1-8. Declaring Variables and Access Modifiers
		Problem
		Solution
		How It Works
	1-9. Converting to and from a String
		Problem
		Solution
		How It Works
	1-10. Passing Arguments via Command-Line Execution
		Problem
		Solution
		How It Works
	1-11. Accepting Input from the Keyboard
		Problem
		Solution
		How It Works
	1-12. Documenting Your Code
		Problem
		Solution
		How It Works
			Formatting the Documentation
			Executing the Tool
	1-13. Reading Environment Variables
		Problem
		Solution
		How It Works
	1-14. Summary
Chapter 2: Enhancements from Java 9 Through Java 17
	2-1. Introduction to the var Keyword
		Problem
		Solution
		How It Works
	2-2. Reading the Contents of Files
		Problem
		Solution
		How It Works
	2-3. Writing a Text Block
		Problem
		Solution
		How It Works
	2-4. The Enhancement of NullPointerException
		Problem
		Solution
		How It Works
	2-5. Pattern Matching for instanceof
		Problem
		Solution
		How It Works
	2-6. Using Record
		Problem
		Solution
		How It Works
	2-7. Restore Always-Strict Floating-Point Semantics
		Problem
		Solution
		How It Works
	2-8. Pseudorandom Number Generators
		Problem
		Solution
		How It Works
	2-9. Sealed Classes
		Problem
		Solution
		How It Works
	2-10. The Vector API
		Problem
		Solution
		How It Works
	2-11. Avoiding Redundancy in Interface Code
		Problem
		Solution
		How It Works
	2-12. Easily Retrieving Information on OS Processes
		Problem
		Solution
		How It Works
	2-13. Handling try-with-resources Construct
		Problem
		Solution
		How It Works
	2-14. Filtering Data Before and After a Condition with Streams
		Problem
		Solution
		How It Works
	2-15. Utilizing Factory Methods to Create Immutable Collections
		Problem
		Solution
		How It Works
	2-16. Pattern Matching for switch (Preview)
		Problem
		Solution
		How It Works
	2-17. Summary
Chapter 3: Strings
	3-1. Compact Strings
	3-2. Obtaining a Subsection of a String
		Problem
		Solution
		How It Works
	3-3. Comparing Strings
		Problem
		Solution
		How It Works
	3-4. Trimming Whitespace
		Problem
		Solution
		How It Works
	3-5. Discovering Blank Strings
		Problem
		Solution
		How It Works
	3-6. Stripping Whitespace
		Problem
		Solution
		How It Works
	3-7. Breaking String Lines
		Problem
		Solution
		How It Works
	3-8. Repeating Strings
		Problem
		Solution
		How It Works
	3-9. Changing the Case of a String
		Problem
		Solution
		How It Works
	3-10. Concatenating Strings
		Problem
		Solution 1
		Solution 2
		Solution 3
		How It Works
	3-11. Converting Strings to Numeric Values
		Problem
		Solution 1
		Solution 2
		How It Works
	3-12. Iterating Over the Characters of a String
		Problem
		Solution
		How It Works
	3-13. Finding Text Matches
		Problem
		Solution 1
		Solution 2
		How It Works
	3-14. Replacing All Text Matches
		Problem
		Solution
		How It Works
	3-15. Determining Whether a File Suffix Matches a Given String
		Problem
		Solution
		How It Works
	3-16. Making a String That Can Contain Dynamic Information
		Problem
		Solution 1
		Solution 2
		How It Works
	3-17. Summary
Chapter 4: Numbers and Dates
	4-1. Rounding Float and Double Values to Integers
		Problem
		Solution
		How It Works
	4-2. Formatting Double and Long Decimal Values
		Problem
		Solution
		How It Works
	4-3. Formatting Compact Number
		Problem
		Solution
		How It Works
	4-4. Comparing int Values
		Problem
		Solution 1
		Solution 2
		How It Works
	4-5. Comparing Floating-Point Numbers
		Problem
		Solution 1
		Solution 2
		How It Works
	4-6. Randomly Generating Values
		Problem
		Solution 1
		Solution 2
		How It Works
	4-7. Obtaining the Current Date Without Time
		Problem
		Solution
		How It Works
	4-8. Obtaining a Date Object Given Date Criteria
		Problem
		Solution
		How It Works
	4-9. Obtaining a Year-Month-Day Date Combination
		Problem
		Solution 1
		Solution 2
		How It Works
	4-10. Obtaining and Calculating Times Based on the Current Time
		Problem
		Solution
		How It Works
	4-11. Obtaining and Using the Date and Time Together
		Problem
		Solution 1
		Solution 2
		Solution 3
		How It Works
	4-12. Obtaining a Machine Timestamp
		Problem
		Solution
		How It Works
	4-13. Converting Dates and Times Based on he Time Zone
		Problem
		Solution
		How It Works
	4-14. Comparing Two Dates
		Problem
		Solution
		How It Works
	4-15. Finding the Interval Between Dates and Times
		Problem
		Solution 1
		Solution 2
		How It Works
	4-16. Obtaining Date-Time from a Specified String
		Problem
		Solution
		How It Works
	4-17. Formatting Dates for Display
		Problem
		Solution 1
		Solution 2
		How It Works
	4-18. Writing Readable Numeric Literals
		Problem
		Solution
		How It Works
	4-19. Declaring Binary Literals
		Problem
		Solution
		How It Works
	4-20. Period of Day
		Problem
		Solution
		How It Works
	4-21. Summary
Chapter 5: Object-Oriented Java
	5-1. Controlling Access to Members of a Class
		Problem
		Solution
		How It Works
	5-2. Making Private Fields Accessible to Other Classes
		Problem
		Solution
		How It Works
	5-3. Creating a Class with a Single Instance
		Problem
		Solution 1
		Solution 2
		How It Works
	5-4. Generating Instances of a Class
		Problem
		Solution
		How It Works
	5-5. Creating Reusable Objects
		Problem
		Solution
		How It Works
	5-6. Defining an Interface for a Class
		Problem
		Solution
		How It Works
	5-7. Modifying Interfaces Without Breaking Existing Code
		Problem
		Solution
		How It Works
	5-8. Constructing Instances of the Same Class with Different Values
		Problem
		Solution
		How It Works
	5-9. Interacting with a Class via Interfaces
		Problem
		Solution
		How It Works
	5-10. Making a Class Cloneable
		Problem
		Solution
		How It Works
	5-11. Comparing Objects
		Problem
		Solution 1
		Solution 2
		How It Works
	5-12. Extending the Functionality of a Class
		Problem
		Solution
		How It Works
	5-13. Defining a Template for Classes to Extend
		Problem
		Solution
		How It Works
	5-14. Increasing Class Encapsulation
		Problem
		Solution
		How It Works
	5-15. Summary
Chapter 6: Lambda Expressions
	6-1. Writing a Simple Lambda Expression
		Problem
		Solution
		How It Works
	6-2. Enabling the Use of Lambda Expressions
		Problem
		Solution 1
		Solution 2
		How It Works
	6-3. Invoking Existing Methods by Name
		Problem
		Solution
		How It Works
	6-4. Sorting with Fewer Lines of Code
		Problem
		Solution 1
		Solution 2
		How It Works
	6-5. Filtering a Collection of Data
		Problem
		Solution
		How It Works
	6-6. Implementing Runnable
		Problem
		Solution
		How It Works
	6-7. Accessing Class Variables from a Lambda Expression
		Problem
		Solution
		How It Works
	6-8. Passing Lambda Expressions to Methods
		Problem
		Solution
		How It Works
	6-9. Local Variable
		Problem
		Solution
		How It Works
	6-10. Switch Expressions
		Problem
		Solution
		How It Works
	6-11. Summary
Chapter 7: Data Sources and Collections
	7-1. Defining a Fixed Set of Related Constants
		Problem
		Solution
		How It Works
	7-2. Designing Intelligent Constants
		Problem
		Solution
		How It Works
	7-3. Executing Code Based on a Specified Value
		Problem
		Solution
		How It Works
	7-4. Working with Fix-Sized Arrays
		Problem
		Solution
		How It Works
	7-5. Safely Enabling Types or Methods to Operate on Objects of Various Types
		Problem
		Solution
		How It Works
	7-6. Working with Dynamic Arrays
		Problem
		Solution
		How It Works
	7-7. Making Your Objects Iterable
		Problem
		Solution
		How It Works
	7-8. Iterating Collections
		Problem
		Solution
		How It Works
	7-9. Iterating Over a Map
		Problem
		Solution
		How It Works
	7-10. Executing Streams in Parallel
		Problem
		Solution
		How It Works
	7-11. Summary
Chapter 8: Input and Output
	8-1. Serializing Java Objects
		Problem
		Solution
		How It Works
	8-2. Serializing Java Objects More Efficiently
		Problem
		Solution
		How It Works
	8-3. Serializing Java Objects as XML
		Problem
		Solution
		How It Works
	8-4. Creating a Socket Connection and Sending Serializable Objects Across the Wire
		Problem
		Solution
		How It Works
	8-5. Obtaining the Java Execution Path
		Problem
		Solution
		How It Works
	8-6. Copying a File
		Problem
		Solution
		How It Works
	8-7. Moving a File
		Problem
		Solution
		How It Works
	8-8. Iterating Over Files in a Directory
		Problem
		Solution
		How It Works
	8-9. Querying (and Setting) File Metadata
		Problem
		Solution
		How It Works
	8-10. Monitoring a Directory for Content Changes
		Problem
		Solution
		How It Works
	8-11. Reading Property Files
		Problem
		Solution
		How It Works
	8-12. Uncompressing Files
		Problem
		Solution
		How It Works
	8-13. Summary
Chapter 9: Exceptions and Logging
	9-1. Catching Exceptions
		Problem
		Solution
		How It Works
	9-2. Guaranteeing a Block of Code Is Executed
		Problem
		Solution
		How It Works
	9-3. Throwing Exceptions
		Problem
		Solution
		How It Works
	9-4. Catching Multiple Exceptions
		Problem
		Solution 1
		Solution 2
		How It Works
	9-5. Catching the Uncaught Exceptions
		Problem
		Solution 1
		Solution 2
		How It Works
	9-6. Managing Resources with try/catch Blocks
		Problem
		Solution
		How It Works
	9-7. Creating an Exception Class
		Problem
		Solution 1
		Solution 2
		How It Works
	9-8. Logging Events Within Your Application
		Problem
		Solution
		How It Works
	9-9. Rotating and Purging Logs
		Problem
		Solution
		How It Works
	9-10. Logging Exceptions
		Problem
		Solution
		How It Works
	9-11. Summary
Chapter 10: Concurrency
	10-1. Starting a Background Task
		Problem
		Solution
		How It Works
	10-2. Updating (and Iterating) a Map
		Problem
		Solution
		How It Works
	10-3. Inserting a Key into a Map Only If the Key Is Not Already Present
		Problem
		Solution
		How It Works
	10-4. Iterating Through a Changing Collection
		Problem
		Solution 1
		Solution 2
		How It Works
	10-5. Coordinating Different Collections
		Problem
		Solution 1
		Solution 2
		How It Works
	10-6. Splitting Work into Separate Threads
		Problem
		Solution
		How It Works
	10-7. Coordinating Threads
		Problem
		Solution 1
		Solution 2
		Solution 3
		How It Works
	10-8. Creating Thread-Safe Objects
		Problem
		Solution 1
		Solution 2
		How It Works
	10-9. Implementing Thread-Safe Counters
		Problem
		Solution
		How It Works
	10-10. Updating a Common Value Across Multiple Threads
		Problem
		Solution
		How It Works
	10-11. Executing Multiple Tasks Asynchronously
		Problem
		Solution
		How It Works
	10-12. Summary
Chapter 11: Unicode, Internationalization, and Currency Codes
	11-1. Converting Unicode Characters to Digits
		Problem
		Solution
		How It Works
	11-2. Creating and Working with Locales
		Problem
		Solution
		How It Works
	11-3. Matching and Filtering Locales
		Problem
		Solution
		How It Works
	11-4. Searching Unicode with Regular Expressions
		Problem
		Solution 1
		Solution 2
		How It Works
	11-5. Overriding the Default Currency
		Problem
		Solution
		How It Works
	11-6. Converting Byte Arrays to and from Strings
		Problem
		Solution
		How It Works
	11-7. Converting Character Streams and Buffers
		Problem
		Solution 1
		Solution 2
		How It Works
	11-8. Summary
Chapter 12: Working with Databases
	12-1. Installing MySQL
		Problem
		Solution
		How It Works
	12-2. Connecting to a Database
		Problem
		Solution
		How It Works
	12-3. Handling Connection and SQL Exceptions
		Problem
		Solution
		How It Works
	12-4. Querying a Database and Retrieving Results
		Problem
		Solution
		How It Works
	12-5. Performing CRUD Operations
		Problem
		Solution
		How It Works
	12-6. Simplifying Connection Management
		Problem
		Solution
		How It Works
	12-7. Guarding Against SQL Injection
		Problem
		Solution
		How It Works
	12-8. Performing Transactions
		Problem
		Solution
		How It Works
	12-9. Creating a Scrollable ResultSet
		Problem
		Solution
		How It Works
	12-10. Creating an Updatable ResultSet
		Problem
		Solution
		How It Works
	12-11. Caching Data for Use When Disconnected
		Problem
		Solution
		How It Works
	12-12. Obtaining Dates for Database Use
		Problem
		Solution
		How It Works
	12-13. Closing Resources Automatically
		Problem
		Solution
		How It Works
	12-14. Summary
Chapter 13: Java Web Applications
	13-1. Installing Tomcat
		Problem
		Solution
		How It Works
	13-2. Creating an HTML Page
		Problem
		Solution
		How It Works
	13-3. Creating a JSP Page
		Problem
		Solution
		How It Works
	13-4. Listing the HTML-Request Parameters
		Problem
		Solution
		How It Works
	13-5. Creating and Configuring a Web Project
		Problem
		Solution
		How It Works
	13-6. Creating a Servlet
		Problem
		Solution
		How It Works
	13-7. Using a Servlet for Representing Values
		Problem
		Solution
		How It Works
	13-8. Summary
Chapter 14: Email
	14-1. Installing JavaMail
		Problem
		Solution
		How It Works
	14-2. Sending an Email
		Problem
		Solution
		How It Works
	14-3. Attaching Files to an Email Message
		Problem
		Solution
		How It Works
	14-4. Sending an HTML Email
		Problem
		Solution
		How It Works
	14-5. Sending Email to a Group of Recipients
		Problem
		Solution
		How It Works
	14-6. Checking Email
		Problem
		Solution
		How It Works
	14-7. Summary
Chapter 15: JSON and XML Processing
	15-1. Writing an XML File
		Problem
		Solution
		How It Works
	15-2. Reading an XML File
		Problem
		Solution 1
		Solution 2
		How It Works
	15-3. Transforming XML
		Problem
		Solution
		How It Works
	15-4. Validating XML
		Problem
		Solution
		How It Works
	15-5. Working with JSON
		Problem
		Solution
		How It Works
	15-6. Building a JSON Object
		Problem
		Solution
		How It Works
	15-7. Writing a JSON Object to File
		Problem
		Solution
		How It Works
	15-8. Parsing a JSON Object
		Problem
		Solution
		How It Works
	15-9. Summary
Chapter 16: Networking
	16-1. Listening for Connections on the Server
		Problem
		Solution
		How It Works
	16-2. Defining a Network Connection to a Server
		Problem
		Solution
		How It Works
	16-3. Broadcasting to a Group of Recipients
		Problem
		Solution
		How It Works
	16-4. Generating and Reading from URLs
		Problem
		Solution
		How It Works
	16-5. Parsing a URL
		Problem
		Solution
		How It Works
	16-6. Summary
Index