Functional Interfaces in Java: Fundamentals and Examples

Table of Contents
About the Author
About the Technical Reviewer
Foreword
Chapter 1: Functional Interfaces
	Section 1.1: Interfaces in Java
	Section 1.2: Enhancements to Interfaces in Java 8 and Java 9
	Section 1.3: Functional Interfaces Defined
	Section 1.4: Implementing Functional Interfaces with Pre-Java 8 Constructs
	Section 1.5: Providing Default Methods in  Functional Interfaces
	Section 1.6: Providing Static Methods in Functional Interfaces
	Section 1.7: Generic Functional Interfaces
		Section 1.7.1: Generic Functional Interfaces with Type Restrictions
	Section 1.8: Specializing a Generic Functional Interface
	PROJECT 1: Playful Pets
		Problem Statement
		Solution
	Short Problems
	Long Problems
Chapter 2: Lambda Expressions
	Section 2.1: Lambda Expressions Defined
	Section 2.2: Using Lambda Expressions to  Represent Functional Interfaces
	Section 2.3: The Scope of a Lambda Expression
	Section 2.4: Lambda Argument List Variations
	Section 2.5: Lambda Bodies in Block Form
	Section 2.6: Limitations of Lambda Expressions
	PROJECT 2: Compute Square
		Problem Statement
		Solution
	Short Problems
	Long Problems
Chapter 3: Predicates
	Section 3.1: The java.util.function Package
	Section 3.2: The Predicate Interface
	Section 3.3: Passing a Predicate to a Method
	Section 3.4: Chains of Functional Interfaces
	Section 3.5: Predicate Chaining Creates Complex Logical Expressions
		Section 3.5.1: Chains Involving the OR Operation
		Section 3.5.2: Chains Involving the AND Operation
		Section 3.5.3: Chains Involving the ! Operation
		Section 3.5.4: Using Predicate.isEqual
		Section 3.5.5: Using Predicate.not [JAVA 11]
	Section 3.6: Overriding Predicate Default Methods
	Section 3.7: Specializations of Predicates
	Section 3.8: Binary Predicates
	PROJECT 3: Discount Dave
		Problem Statement
		Solution
	Short Problems
	Long Problems
Chapter 4: Functions
	Section 4.1: The Function Interface
	Section 4.2: Passing a Generic Function to a Method
		Section 4.2.1: Passing a Function with Restricted or Known Type Parameters
	Section 4.3: Function Chaining
		Section 4.3.1: Chains Involving the andThen Method
		Section 4.3.2: Chains Involving the compose Method
	Section 4.4: The Function.identity Method
	Section 4.5: Specializations of Functions Which Convert from Primitive Types
	Section 4.6: Specializations of Functions Which Convert to Primitive Types
	Section 4.7: Non-generic Specializations of Functions
	Section 4.8: Binary Functions
	Section 4.9: Creating Chains Using BiFunctions
	Section 4.10: Specializations of BiFunctions Which Convert to Primitive Types
	PROJECT 4: Sales Promotions
		Problem Statement
		Solution
	Short Problems
	Long Problems
Chapter 5: Operators
	Section 5.1: The UnaryOperator Interface
	Section 5.2: Specializations of UnaryOperator
		Section 5.2.1: Chains Involving UnaryOperator Specializations
	Section 5.3: The BinaryOperator Interface
	Section 5.4: Non-generic Specializations of  BinaryOperator
	PROJECT 5: Calculator
		Problem Statement
		Solution
	Short Problems
	Long Problems
Chapter 6: Consumers
	Section 6.1: The Consumer Interface
	Section 6.2: Using Chains of Consumers to Compute Equations
	Section 6.3: Using Consumers with println as the Terminal Operation
	Section 6.4: Non-generic Specializations of Consumers
	Section 6.5: The BiConsumer Interface
	Section 6.6: Specializations of BiConsumer
	PROJECT 6: Bank Transactions
		Problem Statement
		Solution
	Short Problems
	Long Problems
Chapter 7: Suppliers
	Section 7.1: The Supplier Interface
	Section 7.2: Wrapping User Prompts in a Supplier
	Section 7.3: Non-generic Specializations of Suppliers
	PROJECT 7: Ticketing System
		Problem Statement
		Solution
	Short Problems
	Long Problems
Chapter 8: Use in Traversing Objects
	Section 8.1: Traversing Objects Using Iterators
	Section 8.2: Traversing Java Arrays of Primitive Types
		Section 8.2.1: Using Specializations of PrimitiveIterator
	Section 8.3: Traversing Objects Using Spliterators
	Section 8.4: Traversing Iterable Objects
	Section 8.5: Traversing Iterable Objects That Contain Java Arrays of Primitives
		Section 8.5.1: Using Specializations of PrimitiveIterator
	Section 8.6: Traversing Maps
	Section 8.7: Traversing Sets
	PROJECT 8: Payroll
		Problem Statement
		Solution
	Short Problems
	Long Problems
Chapter 9: Use in Collections
	Section 9.1: Removing Elements from a Collection
	Section 9.2: Populating an Array
	Section 9.3: Replacing the Elements of a List or a Map
	Section 9.4: Parallel Computations on Arrays
	Section 9.5: Map Computations
	Section 9.6: Map Merging
	Section 9.7: Functional Interfaces and Sets
	PROJECT 9: Department of Motor Vehicles
		Problem Statement
		Solution
	Short Problems
	Long Problems
Chapter 10: Use in Comparing Objects
	Section 10.1: The Comparator Interface
	Section 10.2: Some Useful Comparator Methods
	Section 10.3: The Comparator comparing Methods
	Section 10.4: Specializations of the Comparator comparing Method
	Section 10.5: Building Chains of Comparators
	Section 10.6: Specializing Comparator Chain Components
	Section 10.7: Using Comparators to Sort Lists
	Section 10.8: Using Comparators to Sort Java Arrays
	Section 10.9: Using Comparators to Organize Maps
	Section 10.10: Using Comparators in BinaryOperator Methods
	PROJECT 10: Real Estate Broker
		Problem Statement
		Solution
	Short Problems
	Long Problems
Chapter 11: Use in Optionals
	Section 11.1: Creating an Optional
	Section 11.2: Determining If an Optional Is Present
	Section 11.3: Retrieving the Contents of an Optional
	Section 11.4: Creating Chains of Optionals
	Section 11.5: Printing the Contents of an Optional
	Section 11.6: Filtering Optionals
	Section 11.7: Optional Chains Involving map and flatmap
	PROJECT 11: Guess a Number
		Problem Statement
		Solution
	Short Problems
	Long Problems
Chapter 12: Use in Streams
	Section 12.1: Generating Stream Elements
	Section 12.2: Traversing Streams
	Section 12.3: Filtering Stream Elements
	Section 12.4: Converting an Object to a Stream
	Section 12.5: Sorting Stream Elements
	Section 12.6: Selecting the Smallest or Largest Element in a Stream
	Section 12.7: flatMap vs. map
	Section 12.8: Reducing Stream Elements
	Section 12.9: Collecting Stream Elements into a Mutable Reduction
		Section 12.9.1: Using Prewritten Collectors
	Section 12.10: Building Streams Interactively
	Section 12.11: Displaying Intermediate Results
	Section 12.12: Stream Specializations
	PROJECT 12: Dave’s Part Inventory
		Problem Statement
		Solution
	Short Problems
	Long Problems
Chapter 13: Use in Multithreaded Programs
	Section 13.1: Performing Computations Using Runnable and Callable
		Section 13.1.1: Using Runnable in Optionals
	Section 13.2: Futures and FutureTasks
	Section 13.3: CompletionStages and  CompletableFutures
	Section 13.4: Creating CompletableFutures and Retrieving Their Results
	Section 13.5: Using the thenApply and thenAccept Methods
	Section 13.6: Processing the First Asynchronous Future to Complete
	Section 13.7: Making a Future Dependent on Another Future
	Section 13.8: Cancelling a Future
	Section 13.9: When Futures Throw Unchecked Exceptions
	Section 13.10: Running Futures in Parallel
	PROJECT 13: Sentence Builder
		Problem Statement
		Solution
	Short Problems
	Long Problems
Chapter 14: Use in Atomic Calculations
	Section 14.1: Atomic Integers
		Section 14.1.1: Accumulating an Atomic Value
		Section 14.1.2: Updating an Atomic Value
		Section 14.1.3: Comparing an Atomic Value
	Section 14.2: Atomic Longs
	Section 14.3: Atomic Booleans
	Section 14.4: Atomic Arrays
	Section 14.5: Atomic References
	PROJECT 14: Bank Account
		Problem Statement
		Solution
	Short Problems
	Long Problems
Chapter 15: Use in JavaFX Applications
	Section 15.1: Handling JavaFX Events
	Section 15.2: Building JavaFX UI Components
	Section 15.3: JavaFX Builder Factories
	Section 15.4: Monitoring Changes in Collections
		Section 15.4.1: Monitoring List Changes
		Section 15.4.2: Monitoring Set Changes
		Section 15.4.3: Monitoring Map Changes
	Section 15.5: Invalidating an Observable Object
	PROJECT 15: DMV GUI
		Problem Statement
		Solution
	Short Problems
	Long Problems
Appendix: Method References
	Section A.1: Using References to Static Methods to Represent Functional Interfaces
	Section A.2: References to Instance Methods
	Section A.3: References to Constructors
	Section A.4: Passing Method References as Arguments
	Section A.5: Representing Functions with Method References
	Section A.6: Using Method References with Comparators
	Section A.7: Using Method References with Streams
Index