Fast Track to Java Training in Finland

Delegates must be proficient programmers, ideally with several years commercial programming experience

• Learn Java from the basics right up to the latest Java 9 features
• Understand when to apply all supported programming styles
• Learn how to use TDD and BDD to test your code
• Become comfortable applying functional and reactive programming techniques

Introducing the Java Landscape

• Origins and goals of the Java language
• Bytecode and the Java Virtual Machine
• Distinguishing between JME and Android
• Where Microservices and the JEE diverge
• Popular languages on the Java platform

Essential JVM Concepts

• Types, packages and archives (JAR/WAR/EAR)
• References and tuning Garbage Collection
• Hierarchical class loading and Agents
• The CLASSPATH environment variable
• The new Module System in Java 9

Basic Java Programming

• Primitive types and literal values
• Java syntax for binary and numeric literals
• The difference between reference and value types
• Converting between strings and numerical types
• Parsing console input with the Scanner class
• Pretty-printing with the Formatter class
• Performing iteration and selection in Java
• Support for strings in switch statements
• Equality with primitive and reference types
• Creating and manipulating arrays
• The costs of string concatenation

Object Oriented Development - Part 1

• Creating basic Java classes
• Choosing accessibility levels
• Inheriting from a base class
• Overloading and overriding methods
• Comparisons using the instanceof operator
• Comparisons using java.lang.Class objects
• Creating abstract and final classes

Object Oriented Development - Part 2

• Writing appropriate class constructors
• Private constructors and singletons
• Static and instance initialization blocks
• Top down class and object initialization
• Declaring and implementing interfaces
• Using inner and anonymous classes
• Implementing equals and hashCode
• Cloning and copy constructors

Enumerations

• Why Java historically lacked enum support
• The Typesafe Enumeration Design Pattern
• How Java 5 baked the pattern into the language
• Extending enums with new members
• Helper methods added to enum types
• Collections which support enums

Annotations and Meta-Programming

• Adding metadata to Java code
• The advantages of annotations
• Annotations verses configuration files
• Declaring Java 5 annotation types
• Understanding meta-annotations
• Adding methods to annotation types
• Defining default values for methods
• Discovering annotations with reflection
• Writing annotation processors in Java 6
• Enhancements to annotations in Java 8

Functional Programming with Method References and Lambdas

• Overview of the key concepts of Functional Programming
• The concept of ‘method references’ in the language and JVM
• Creating references to methods, static methods and constructors
• Understanding when and why to use lambda expressions
• The various syntax options when declaring lambdas
• Making use of the @FunctionalInterface annotation
• Lexical scoping and ‘effectively final’ variables
• Support for type inference of parameters in lambdas
• Best practices when declaring and using lambdas

Introducing the Collections API

• Introducing lists, sets and maps
• Using iterators and enumerations
• Choosing the most efficient collections
• Specialized collections in other packages
• Collections designed for concurrent access
• Open source alternatives to regular collections

Functional Programming With Collections and Streams

• Introducing the java.util.stream.Stream interface
• Different ways of creating streams of objects
• How Optional helps eliminate null pointer exceptions
• Using parallel and sequential to switch processing model
• Performing filtering and mapping on a streams content
• Using reduce to compute a final value from a stream
• Understanding the purpose and value of flatMap
• The collect method and its many different applications
• Enhancements to the streams library in Java 9
• Support for Reactive Programming in Java 9
• Taking Rx further via Project Reactor

Exception Handling in Java

• Introducing errors, runtime exceptions and checked exceptions
• Special consideration for exceptions in constructors and finalizers
• Implementing an effective exception handling strategy
• Using finally blocks properly to perform ‘clean-up’ tasks
• Java 7 improvements to the try…catch syntax
• The try-with-resources syntax introduced in Java 7

Generics in Java

• Introducing Type Parameters and generic code
• Understanding reified vs. non-reified Generics
• Generics is a compile time feature in Java
• Declaring generic classes and methods
• Type inference when creating generic types
• Creating your own generic collection classes
• Support for Generics in the Reflection API
• Using the wildcard type in utility methods
• Defining constraints with bounded wildcards
• Making sense of upper and lower bounds
• Common confusions with wildcards
• How compilers perform Type Erasure

The Date and Time API

• How JSR310 evolved from the Joda Time library
• Working with instants, clocks and time zones
• Performing calculations with dates and times
• Using adjusters to make common changes to dates
• Parsing and formatting dates and times
• Combining the API with legacy code

TDD in Java with JUnit and Mockito

• Defining your intent through tests
• Writing just enough code to pass
• Adding tests and refining the code
• Testing up to the point of boredom
• Triangulating on hard problems
• Moving up and down the gears
• You aren’t going to need it (YAGNI)
• Why encapsulated dependencies are bad
• Using DI to isolate dependencies
• Creating and injecting Test Doubles
• Situations where TDD will not work

Behaviour Driven Development in Java with Cucumber

• How BDD evolved from Test Driven Development
• Writing scenarios using the Gherkin syntax
• Moving shared steps into a background section
• Embedding data tables within scenarios
• Setting up JUnit to run and configure Cucumber
• Creating a class to hold step definitions
• Writing step definitions via annotations in Java 6
• Writing step definitions via lambdas in Java 8
• Matching to the content of steps via regex
• Using sub-matches to capture input values
• How cucumber converts and tokenizes inputs
• Reading and extracting values from data tables