Java SE: Exploiting Modularity and Other New Features Ed 1.1

Introduction

• Course Goals
• Course Objectives
• Introductions
• Audience
• Prerequisites
• Course Map
• Day 1 Schedule (Jigsaw)
• Day 2 Schedule (Non-Jigsaw)
• Lesson Format
• Practice Environment
• JDK Enhancement Proposal (JEP)
• What's Not Covered in This Course
• Benefits Provided Automatically
• Additional Resources
• Practices

Why Modules?

• Objectives
• Topics
• What is a Module?
• Module System
• Modular Development in JDK 9
• Topics
• Reusing Code in Java: Applications as Classes
• Reusing Code in Java: Applications as Packages
• Reusing Code in Java
• Releasing Code in Java: JARs
• JAR Files and Distribution Issues
• Class Path Problems
• JAR Dependency Problems
• Example JAR Duplicate Class Problem 1
• Example JAR Duplicate Class Problem 2
• Topics
• Accessibility
• Module System: Advantages
• Dependencies Across Modules
• A Modular Java Application
• Summary
• Practice: Overview

Working with the Module System

• Objectives
• Topics
• What is a Module
• Module Dependencies with requires
• Module Package Availability with exports
• Module Graph 1
• Module Graph 2
• Transitive Dependencies
• Access to Types via Reflection
• Topics
• Example Hello World Modular Application Code
• Example Hello World Modular File Structure
• Topics
• Compiling a Modular Application
• Single Module Compilation Example
• Multi Module Compilation Example
• Creating a Modular JAR
• Run a Modular Application
• Topics
• TeamGameManager Application Example
• requires and requires transitive in TeamGameManager 1
• requires and requires transitive in TeamGameManager 2
• Topics
• Creating a Modular Project in NetBeans
• Quiz 3-1
• Quiz 3-2
• Quiz 3-3
• Quiz 3-4
• Summary of Keywords
• Summary of Accessibility Between Classes
• Summary
• Practices

The Modular JDK

• Objectives
• Topics
• Modular Development in JDK 9
• The JDK
• The Modular JDK
• Listing the JDK’s Modules
• Topics
• Java SE Modules
• The Modular Graph of Java SE
• The Base Module
• Finding the Right Platform Module
• Modules: Location of Some Tools in JDK 9
• Topics
• Java EE Modules in JDK 9
• Java EE Modules in JDK
• Resolving Java EE Modules in JDK 9
• Example: Resolving Java EE Modules in JDK 9
• Topics
• Changed JDK and JRE Layout
• Topics
• Using JDK Internal APIs
• JDK 9 Encapsulation Policy for JDK Internals
• Illegal Access to JDK Internals in JDK 9
• Quiz 4-1
• Quiz 4-2
• Additional Resources
• Summary
• Practices Overview

Creating Custom Runtime Images

• Objectives
• Topics
• What Is a Custom Runtime Image?
• Link Time
• Topics
• Using jlink to Create a Custom Runtime Image
• Using jlink to Create a Runtime Image
• Example: Using jlink to Create a Runtime Image
• Examining the Generated Image
• Modules Resolved in a Custom Runtime Image
• Advantages of a Custom Runtime Image
• JIMAGE Format
• Footprint of a Custom Runtime Image
• Topics
• Examining a Custom Runtime Image
• Running the Application
• jlink Resolves Transitive Dependencies
• Topics
• Using Plug-ins with the jlink Tool
• Optimizing a Custom Runtime Image
• Example: Optimizing a Custom Runtime Image
• Quiz 5-1
• Quiz 5-2
• Additional Resources
• Summary
• Practices Overview

Migration

• Objectives
• Topics
• The Non-Modular League Application
• Run the Application
• The Unnamed Module
• Topics
• Top down Migration and Automatic Modules
• Automatic Modules
• Top-Down Migration
• Creating module-info.java—Determining Dependencies
• Check Dependencies
• Soccer Module
• League Module
• Library JAR  Automatic Module
• Typical Application Modularized
• Topics
• Bottom up Migration
• Bottom-Up Migration
• display.asci Module Migration
• Modularized Library
• Run Bottom-Up Migrated Application
• Fully Modularized Application
• Module Resolution
• Topics
• More About Libraries
• Run Application with Jackson Libraries
• Open Soccer to Reflection from Jackson Libraries
• Topics
• Split Packages
• Splitting a Java 8 Application into Modules
• Java SE 8 Application Designed with Split Packages
• Migration of Split Package JARs to Java SE 9
• Addressing Split Packages
• Topics
• Cyclic Dependencies
• Addressing Cyclic Dependency 1
• Addressing Cyclic Dependency 2
• Top down or Bottom up Migration Summary
• Summary
• Practice: Overview

Services

• Objectives
• Topics
• Modules and Services
• Components of a Service
• Produce and Consume Services
• Module Dependencies without Services
• Service Relationships
• Expressing Service Relationships
• Topics
• Using the Service Type in competition
• Choosing a Provider Class
• Module Dependencies and Services 1
• Module Dependencies and Services 2
• Module Dependencies and Services 3
• Designing a Service Type
• Topics
• TeamGameManager Application with Additional Services
• module-info.java for competition module
• module-info.java for league and knockout modules
• module-info.java for soccer and basketball modules
• Summary
• Practice: Overview

Multi-Release JAR Files

• Objectives
• Topics
• Packaging an Application for Different JDKs
• Packaging an Application for Different JDK Versions
• The Solution: A Multi-Release JAR file
• What Is a Multi-Release JAR File?
• Topics
• Structure of a JAR File
• Structure of a Multi-Release JAR File
• Example: Structure of a Multi-Release JAR File
• Search Process in an MRJAR
• Topics
• Creating a Multi-Release JAR File
• Example: Creating a Multi-Release JAR File
• Running the Main Class on Java SE 7
• Running the Main Class on Java SE 9
• Topics
• Creating a Modular Multi-Release JAR File
• Example: Creating a Modular Multi-Release JAR File
• Running the Main Class on Java SE 7
• Running the Main Class on Java SE 9 on the Class Path
• Running the Main Class on Java SE 9 on the Module Path
• Summary
• Practice: Overview

Private Methods in Interfaces

• Objectives
• Topics
• Private Methods in Interfaces
• Java SE 7 Interfaces
• Implementing Java SE 7 Interface Methods
• Example: Implementing abstract Methods
• Example: Duplicating Logic
• Quiz 9-1
• Topics
• Implementing Methods in Interfaces
• Example: Implementing default Methods
• Example: Inheriting default Methods
• Example: Overriding a default Method
• What About the Problems of Multiple Inheritance?
• Inheritance Rules of default Methods
• Interfaces Don't Replace Abstract Classes
• Quiz 9-2
• Topics
• What If default Methods Duplicate Logic?
• Duplication Between default Methods
• The Problem with This Approach
• Introducing private Methods in Interfaces
• Example: Using private Methods to Reduce Duplication Between
• default Methods
• Types of Methods in Java SE 9 Interfaces
• Quiz 9-3
• Summary
• Practices

Enhancements to the Stream API

• Objectives
• Topics
• One More Benefit of Default Methods
• Quiz 10-1
• Changing a Java Interface
• Topics
• Why Enhance the Stream API?
• Scenario: A Savings Account
• An Ordered List
• takeWhile Provides a Solution
• The Effects and Benefits of takeWhile
• An Unordered List
• filter vs takeWhile
• Scenario: A Scientific Experiment
• What About the Remaining Elements?
• dropWhile Provides a Solution
• The Effects and Benefits of dropWhile
• Other Notes on takeWhile and dropWhile
• Is There an Alternative to Generating This Stream Manually?
• iterate Is Overloaded in Java SE 9
• Similarities with the for Loop
• Quiz 10-2
• Topics
• Remember Optionals
• Converting an Optional into a Stream
• An Optional Method in the SavingsAccount Class
• The or Method
• The ifPresent and orElse Methods in Java SE 8
• The ifPresentOrElse Method
• Quiz 10-3
• Summary of New Stream Interface Methods
• Summary of New Optional Class Methods
• Summary of Lambda Expressions Types
• Summary
• Practices

JShell

• Objectives
• Topics
• Has This Happened to You?
• A Million Test Classes and Main Methods
• JShell Provides a Solution
• Topics
• Comparing Normal Execution with REPL
• Getting Started with JShell and REPL
• Scratch Variables
• Declaring Traditional Variables
• Code Snippets
• Completing a Code Snippet
• Tab Completion and Tab Tips
• Semicolons
• JShell Commands
• Importing Packages
• Quiz 11-1
• Topics
• JShell API
• Why Incorporate JShell in an IDE?
• Use Cases
• Two Ways to Open JShell in NetBeans
• Summary
• Practices

Convenience Methods for Collections

• Objectives
• Topics
• What Are Convenience Methods?
• Many Convenience Methods in Java SE 9
• Key Collections Interfaces
• Topics
• of Method for Lists
• of Method for Sets
• of Method for Maps
• Quiz 12-1
• Overloading the of Convenience Method
• Why Overload the of Method?
• Growing a Collection
• ofEntries Method for Maps
• Topics
• Immutability
• No Null Values
• No Duplicates
• Randomized Iteration Order
• Quiz 12-2
• Summary
• Practices

Convenience Methods for Arrays

• Objectives
• Topics
• Arrays
• Modeling DNA Strands
• Working with DNA Strands
• Working with DNA Strands by Using a for Loop
• Convenience Methods in the Arrays Class
• Equating DNA Strands
• DNA Subsequences
• Equating Subsequences of DNA
• Many Array Types
• Quiz 13-1
• Topics
• Returning to the DNA Scenario
• Measuring Differences in DNA
• Distances Between Elements
• Absolute Values with compareUnsigned
• Variants of the compare Method
• Comparing Subsequences of DNA
• Only Compare the First Mismatch
• Quiz 13-2
• Topics
• One Last Return to the DNA Scenario
• Pinpointing the Mismatch in DNA Strands
• Variants of the mismatch Method
• Pinpointing the Mismatch Between Subsequences of DNA
• Quiz 13-3
• Summary
• Practices

Enhanced Deprecation

• Objectives
• Topics
• What Is Deprecation?
• What Is Enhanced Deprecation?
• How Do You Deprecate an API?
• Using @deprecated
• Topics
• Enhancements to the @Deprecated Annotation in JDK 9
• Using the @Deprecated Annotation
• Example: Using the @Deprecated Annotation
• Examples of Deprecated APIs in JDK 9
• Topics
• Notifications and Warnings
• Compiler Deprecation Warnings
• Example: Compiler Deprecation Warnings
• Terminal Deprecation Warnings (forRemoval=true)
• Suppressing Deprecation Warnings
• Topics
• Static Code Analysis
• Benefits of jdeprscan
• Running jdeprscan
• Static Analysis Using jdeprscan
• jdeprscan Analysis Can Be Version-Specific
• Quiz 14-1
• Quiz 14-2
• Additional Resources
• Summary
• Practices Overview