Java 8 New Features

Course covers the following areas of Java 8:

• New interface capabilities
• Lambda expressions and method references
• Functional interfaces
• Java Streams
• New parallel processing capabilities and the Stream API
• New Date / Time API

Java Programmers who need to become familiar with the new features in Java 8.
 

The course is hands on, and requires that students be comfortable with writing general Java code at an intermediate level, including the use of interfaces.
 

Java 8 New Features

• Workshop Overview
• Workshop Agenda
• Typographic Conventions
• Labs

Session 1: What's New in Interfaces

• Lesson Objectives
• Interfaces – Quick Review
• Interfaces – Example

Default Methods

• Default Methods
• Default Methods – Example
• Motivation and Benefits of Default Methods
• Motivation and Benefits of Default Methods
• Inheritance Issues

Static Methods

• Static Methods
• Benefits of Static Methods

Functional Interfaces

• Functional Interface – Defined
• Functional Interfaces – Details
• Case Study – Comparator
  • Lab 1.1: Setup, Default Methods, Static Methods
• Review Questions

Session 2: Lambda Expressions

• Lesson Objectives

Overview

• Motivation: Common Actions Are Verbose
• Too Much Window Dressing
• Introducing Lambda Expressions
• Functional Interfaces and Lambdas
• Lambdas Occur in a Target Context
• Relationship to Functional Interfaces

Using Lambda Expressions

• Lambda Expression Syntax – Overview
• Lambda Compatibility
• What about the Parameter Types?
• Lambda Expression Syntax – Details
• Lambda Expression Syntax – Details
• What's the Big Deal? Where Do I Use Them?
  • Lab 2.1: Getting Started with Lambdas

Method References

• Lambdas Can Leverage Existing Code
• Lambdas and Local Variables
• Variable Capture in Lambdas – Example
• Method References
• Types of Method References
• Recipes to Use Method References
• Refactoring Lambdas into Method References
  • Lab 2.2: Method References
• The Other Side of the Method Call
• Using a Functional Interface Type – Example
• Review Questions

Session 3: Streams

• Lesson Objectives

Overview

• Collections Are Great...for What They Do
• Collections Have Shortcomings
• Analogy: Data vs. DBMS
• Analogy: Collections = Data, Streams = DBMS
• Streams – Before and After
• What Are Streams?
• Anatomy of a Stream – Details
• Anatomy of a Stream – Illustrated
• Streams vs. Collections
• Stream Example – a First Look

Understanding the Stream API

• Stream API – Overview
• Using the Stream API – Illustrated
• Chained Method Calls – Illustrated
• Keys to Understanding the API
• Keys to Understanding the API
• Java 8 Functional Interfaces
• Functional Interface: Predicate<T>
• Functional Interface: Comparator<T>
• Functional Interface: Function<T,R>

Stream Processing

• filter(Predicate)
• sorted() sorted(Comparator)
• Comparator.comparing() – Details
• Comparator Methods Added in Java 8
• Comparator Chaining – Example
  • Lab 3.1: Filtering and Sorting
• map(Function)
• map(Function) – Example
• Functional Interface: Consumer<T>
• peek(Consumer)
• 'Trimming' Operations of Stream
• Terminal Operations of Stream
• Terminal void Operations – Example
• Terminal Reduction Operations
• Terminal Reduction Operations – Example
• Existence Operations of Stream
• Finder Operations of Stream
• Statistics Operations
  • Lab 3.2: Advanced Stream Processing

Collectors

• Role and Capabilities of Collectors
• Collectors – Our Approach
• Collectors.toList() and .toSet()
• Functional Interface: Supplier<T>
• Collectors.toCollection()
• Stream.collect(Collector) Method – Details
• Collector Interface – Details
• Determining a Collector's Product
• Determining a Collector's Product
  • Lab 3.3: Getting Started with Collectors
• Partitioning and Grouping – Overview
• Partitioning Collectors
• Grouping Collectors
  • Lab 3.4: Partitioning and Grouping
• Reducing and Summarizing Collectors
• Determining Their Products – Revisited
• Reducing Collectors Have Two Roles
• Standalone Reduction Collector – Example
• Downstream Reduction Collector – Example
• Downstream Reduction Collector – Example
• mapping() Collector
• joining() Collector
• Building a Custom Map
• Other Uses for Downstream Collectors
  • Lab 3.5: Reducing and Summarizing
• Review Questions

Session 4: Parallel Processing and Concurrency

• Lesson Objectives

Overview

• Parallelism – Overview
• Sequential Processing – Illustrated
• Parallel Processing – Illustrated
• Java 8 Parallel Processing
• Stream Parallel Processing – Example
• Enabling Parallel Processing
  • Lab 4.1: Simple Parallel Processing

Mechanisms and Guidelines

• parallel() and sequential() – Details
• Parallel Streams Use Fork/Join
• Fork/Join – Illustrated
• Parallel Processing – Ground Rules
• Parallel Processing – Ground Rules
• Parallel Processing – Guidelines
• Parallel Processing – Guidelines
• Parallel Processing – Guidelines
  • Lab 4.2: Looking at Performance

Multithreading Issues

• Overview of Multithreading
• Singlethreaded / Sequential Example
• Multithreaded / Parallel Example
• Race Conditions
• Data Synchronization
• Using a Mutex
• Parallel Streams and Shared Mutable State
  • Lab 4.3: Data Integrity
• Review Questions

Session 5: Date and Time API

• Lesson Objectives

Overview

• Previous Java Date/Time Support – History
• Java 8 Date/Time Support – Overview
• How We'll Cover the API

Dates, Times, and Instants

• Date and Time Classes – Overview
• Creating Dates and Times
• Creating Dates and Times – now() and of()
• Creating Dates and Times – parse()
• Formatting Dates and Times – format()
• Accessing Date and Time Fields
• Accessing Date and Time Fields – getXXX()
• Accessing Date and Time Fields – get()
• Comparing Instances
  • Lab 5.1: Working with Dates and Times
• Deriving New Values
• Deriving New Values – withXXX()
• Deriving New Values – with()
• Adding and Subtracting
• Adding / Subtracting – plusXXX()/minusXXX()
• Adding and Subtracting – plus() / minus()
• Instant
• Time-Zones
• ZonedDateTime
• Determining 'Equivalent' Local Time
  • Lab 5.2: Deriving New Values

Periods and Durations

• Intervals of Time – Period and Duration
• Interval between Two Dates/Times
• Creating Custom Intervals
• Adding an Interval to a Date/Time
• Adding and Subtracting Intervals – Example
  • Lab 5.3: Periods and Durations
• Review Questions

Session 6: Other Capabilities

• Compact Profiles
• Optional<T> – a Deeper Look
• Repeatable Annotations
• Type Annotations
• Nashorn JavaScript Engine
• Other Additions / Improvements
• Deprecated Features

Recap

• Recap of What We've Done
• Resources