Intermediate/Advanced Java

Course Objectives

Solidify Java foundational knowledge, including the important contracts of class Object Understand the uses and consequences of inheritance and composition, and reinforce the role of interfaces Reinforce fundamental OO principles such as cohesion, coupling, and polymorphism Use the JUnit testing framework and become fluent in writing assertions to verify correct program behavior Familiarity with UML modeling in class diagrams and sequence diagrams Use advanced techniques for object creation, including factories and singletons Use established design patterns for object composition, including Strategy, Decorator, and Facade Write and use generic classes and methods Learn the use cases for inner classes and refactor existing code to use them when appropriate Create and use custom annotations Be familiar with reflection and how to use it Understand the role of functional interfaces Understand lambda expressions and method references, and use them to pass behavior (methods) Use the Stream API to perform complex processing of collections and other input sources Create and use Java modules, understanding module descriptors, modular JARs, exports and dependencies, and the modulepath Understand the structure and behavior of the modular JDK, and how it supports modular applications as well as legacy classpath-based code Migrate classpath-based applications to Java 11, understanding the stages of migration and options available

Prerequisites

Working knowledge of Java programming, including use of inheritance, interfaces, and exceptions

Preface: Java State of the Union

Java Release Cycle New Java Versions

Review - Basics

Java Environment Classes and Objects Instance Variables, Methods, Constructors, Static Members OO Principles: Data Encapsulation, Cohesion Object Contracts: toString(), equals() and hashCode(), Comparable and Comparator Packages, Enums, Arrays Exceptions Date and Time API New Language Features

Review (Inheritance and Interfaces)

UML Overview Inheritance Definition and IS-A Relationship Method Overriding, @Override OO Principles: Principle of Substitutability, Polymorphism and Encapsulation of Type, Coupling, Open-Closed Principle Constructor Chaining Interfaces Defining and Implementing, Interface Types Interface Inheritance New Interface Features (Java 8+) Default Methods, Static Methods Functional Interfaces Guidelines

JUnit

Overview Tests, Assertions, and Fixtures Writing and Running Tests Assertions Test Fixtures, @Before and @After, @BeforeClass and @AfterClass Testing for Exceptions Best Practices and Test-Driven Development Overview (TDD)

Collections and Generics

Collections Overview Generics and Type-Safe Collections Diamond Operator Lists, Sets, and Maps Interfaces and Contracts Iteration and Autoboxing Utility Classes - Collections and Arrays Writing Generic Classes Inheritance with Generic Types Wildcard Parameter Types Type Erasure

Techniques of Object Creation

Design Patterns Overview Controlling Object Creation Limitations of new Operator, Alternative Techniques Singleton Pattern Simple Factory Factory Method Pattern Other Techniques Named Objects, JNDI Dependency Injection Frameworks

Using Composition and Inheritance Effectively

Inheritance and Composition - Pros and Cons Composition and Delegation HAS-A, USES Relationships Strategy Pattern Decorator Pattern Façade and Other Patterns Façade, Proxy, Template Method

Inner Classes

Overview and Motivation Stronger Encapsulation, Rules and Caveats Defining and Using Inner Classes Member-Level, Method-Local, Anonymous Classes Static Nested Classes Nested Classes, Nested Interfaces, Nested Enums

Annotations

Overview Using Annotations Target and Retention Policy Annotation Parameters, Parameter Shortcuts Writing Custom Annotations Syntax, Using the Meta-Annotations Using a Custom Annotation

Reflection

Overview and API The Class Called Class Obtaining and Inspecting Class Objects Working with Objects Reflectively Creating Instances, Invoking Methods, Setting Field Values

Lambda Expressions

Functional Interfaces and Lambdas Target Context Using Lambda Expressions Syntax, Lambda Compatibility Variable Capture Type Inference Method References Three Types of Method References Refactoring Lambdas into Method References

Streams

Overview Streams vs. Collections Anatomy of a Stream Understanding the Stream API Intermediate Operations and Stream Pipeline Java 8 Functional Interfaces: Predicate, Comparator, Function Stream Processing Filtering, Sorting, Mapping Terminal Operations Collectors Concepts Partitioning and Grouping

Introduction to Modules

Motivation and Overview Types of Modules Modular JDK Our Approach

Working with Modules

Defining and Using Modules Services Compatibility and Migration

Supported Software Environments

Standard: Java SE and Eclipse IDE Other Available IDEs: IntelliJ IDEA, IBM RAD (upon request)