Transitioning From Java 7 to Java 9 (TT2179)

Session: Evolving Interfaces

Lesson: Evolving Interfaces

• Interfaces in Java 8
• Default methods
• Static methods
• Multiple Inheritance?

Session: Lambda Expressions; Collections and Streams

Lesson: Introduction to Lambda Expressions

• Functional vs OO Programming
• Anonymous Inner-classes
• Lambda Expression Syntax
• Functional Interfaces
• Method references
• Constructor references

Lesson: Java 8 Collection Updates

• Introduce the ConcurrentHashMap
• Lambda expressions and Collections

Lesson: Streams

• Processing Collections of data
• The Stream interface
• Reduction and Parallelism
• Filtering collection data
• Sorting Collection data
• Map collection data
• Find elements in Stream
• Numeric Streams
• Create infinite Streams
• Sources for using Streams

Lesson: Collectors

• Creating Collections from a Stream
• Group elements in the Stream
• Multi-level grouping of elements
• Partitioning Streams

Session: Additional Java 8 Enhancements

Lesson: The new Date/Time API

• Introduce the new Date/Time API
• LocalDate, LocalDateTime, etc.
• Formatting Dates
• Working with time zones
• Manipulate date/time values

Lesson: Optional

• Introduce Optional
• Implement Optional attributes
• Lambda expressions and Optional

Lesson: Other new Java 8 features

• StringJoiner
• Repeating and Type Annotations
• Parallel Array Sorting
• Improved type inference
• Method parameter reflection
• Updated command line tooling

Lesson: Java 8 Concurrency Updates

• The common thread pool
• Atomic variables
• LongAdder and LongAccumulator
• CompletableFuture
• Non-blocking asynchronous tasks

Session: Java 9

Lesson: Introduction to Java 9

• Introduction to Java 9
• Java Community Process (JCP)
• JDK Enhancement Proposal (JEP)

Lesson: New in Java 9

• Introduce some of the 'smaller' Java 9 topics
• Java versioning
• The JDK/JRE file structure
• Deprecation
• The jdeprscan tool
• Multi-Release JAR Files
• HTML 5 compliant JavaDoc

Lesson: Milling Project Coin

• Changes made to the language since Java 6
• Multi-catch
• Using effectively final variables in try-with-resources
• Suppressed Exceptions
• Binary literals
• Reserved underscore (Java 9)
• Type inference in anonymous classes (Java 9)
• @SafeVargs (updates in Java 9)
• Default and static methods in interfaces (Java 8)
• Private methods in interfaces (Java 9)

Lesson: Collection and Stream Updates

• Factory methods for Immutable Collection types
• The takeWhile and dropWhile methods
• The Stream Iterate and ofNullable methods

Session: The Java Module system (Jigsaw)

Lesson: Why JigSaw?

• Problems with Classpath
• Encapsulation and the public access modifie
• Application memory footprint
• Java 8’s compact profile
• Using internal JDK APIs

Lesson: Introduction to the Module System

• Introduce Project Jigsaw
• Classpath and Encapsulation
• The JDK internal APIs
• Java 9 Platform modules
• Defining application modules
• Define module dependencies
• Implicit dependencies
• Implied Readability
• Exporting packages

Lesson: The Module Descriptor

• Define module requirements
• Explain qualified exports
• Open modules for reflection
• Use ServiceLoader
• The provides and uses keywords

Lesson: Working with Modules

• Being backwards compatible
• The ModulePath and ClassPath
• Unnamed Modules
• Automatic Modules
• The JLink tool

Session: JShell

Lesson: JShell

• Introduction to JShell
• Running Expressions in JShell
• Importing packages
• Defining methods and types
• Using the JShell editor
• Save and loading state

Session: More Java 9

Lesson: Concurrency Updates in Java 9

• Brief overview of Concurrency in Java
• Overview of CompletableFuture (Java 8)
• Subclassing the CompletableFuture
• The default Executor
• New Factory methods
• Dealing with time-outs

Lesson: Other New Java 9 Features

• Enhancements on the Optional class
• Improvements made in the Process API
• The Stack-Walking API
• The HTTP2 Client
• The Multi-Resolution API

Lesson: Performance Optimizations

• Performance in Java 9
• Compact Strings
• String deduplication
• Ahead-Of-Time Compilation
• Hotspot Diagnostic commands
• The G1 Garbage collector
• Variable and Method Handles

Lesson: Memory Management

• Understand memory management in Java
• Discuss the various garbage collectors
• The Garbage-First (G1) Garbage Collector

Working within in an engaging, hands-on learning environment, guided by our expert team, attendees will learn to:

• Understand not only the fundamentals of the Java language, but also its importance, uses, strengths and weaknesses
• What functional programming means and what it brings to the table
• How Lambda expressions and functional interfaces can greatly enhance other aspects of Java
• Explore the new ‘features’ of the Collection API
• To use the new Stream constructs to work with Collections and Collectors
• How to work with default methods and pass methods as arguments
• How to use the new features to support concurrency in multi-code systems
• To work with the new Date/Time API and other new features
• Develop modular applications in Java
• Migrate existing Java applications to the Java 9 platform
• Utilize the tooling that is provided in Java 9 to migrate, monitor and optimize applications
• Use the new JShell tool to quickly test java constructs
• Improve implementations already using Java 8’s Stream API by utilizing the methods new in Java 9
• Understand how the implementation of the String class has been updated to decrease the memory footprint
• Use the enhancements made to the Concurrency API, working with CompletableFuture instance of Thread pools
• Take the first step towards Reactive programming using Java’s Reactive Stream Flow API

Specific Java 8 features that are covered in the course include:

• Functional programming
• Anonymous functions
• Lambda expressions and default methods
• Streams and Collectors
• New Date/Time API
• StringJoiner and repeating annotations

Specific Java 9 features that are covered in the course include:

• The Java Module System (project Jigsaw)
• JShell
• Updated try-with-resources
• Performance enhancements in Java 9
• Updates to Collection and Stream API

Attendees should have an working knowledge in developing basic Java 8 applications.

This is an intermediate level Java SE (JSE) developer course, designed for experienced Java 8 developers.