Book Image

Learn Java 12 Programming

By : Nick Samoylov

Book Image

Learn Java 12 Programming

By: Nick Samoylov

Overview of this book

Java is one of the preferred languages among developers, used in everything right from smartphones, and game consoles to even supercomputers, and its new features simply add to the richness of the language. This book on Java programming begins by helping you learn how to install the Java Development Kit. You will then focus on understanding object-oriented programming (OOP), with exclusive insights into concepts like abstraction, encapsulation, inheritance, and polymorphism, which will help you when programming for real-world apps. Next, you’ll cover fundamental programming structures of Java such as data structures and algorithms that will serve as the building blocks for your apps. You will also delve into core programming topics that will assist you with error handling, debugging, and testing your apps. As you progress, you’ll move on to advanced topics such as Java libraries, database management, and network programming, which will hone your skills in building professional-grade apps. Further on, you’ll understand how to create a graphic user interface using JavaFX and learn to build scalable apps by taking advantage of reactive and functional programming. By the end of this book, you’ll not only be well versed with Java 10, 11, and 12, but also gain a perspective into the future of this language and software development in general.

Preface

Who this book is for

What this book covers

To get the most out of this book

Free Chapter

Section 1: Overview of Java Programming

Section 1: Overview of Java Programming

Getting Started with Java 12

Getting Started with Java 12

How to install and run Java

How to install and run an IDE

Java primitive types and operators

String types and literals

Identifiers and variables

Java statements

Java Object-Oriented Programming (OOP)

Java Object-Oriented Programming (OOP)

Overloading, overriding, and hiding

Final variable, method, and classes

Polymorphism in action

Java Fundamentals

Java Fundamentals

Packages, importing, and access

Java reference types

Reserved and restricted keywords

Usage of the this and super keywords

Converting between primitive types

Converting between primitive and reference types

Section 2: Building Blocks of Java

Section 2: Building Blocks of Java

Exception Handling

Exception Handling

Java exceptions framework

Checked and unchecked exceptions

The try, catch, and finally blocks

The throws statement

The throw statement

The assert statement

Best practices of exceptions handling

Strings, Input/Output, and Files

Strings, Input/Output, and Files

Strings processing

File management

Apache Commons utilities FileUtils and IOUtils

Data Structures, Generics, and Popular Utilities

Data Structures, Generics, and Popular Utilities

List, Set, and Map interfaces

Collections utilities

Arrays utilities

Object utilities

java.time package

Java Standard and External Libraries

Java Standard and External Libraries

Java Class Library

External libraries

Multithreading and Concurrent Processing

Multithreading and Concurrent Processing

Thread versus process

User thread versus daemon

Extending class thread

Implementing interface Runnable

Extending thread vs implementing Runnable

Using pool of threads

Getting results from thread

Parallel vs concurrent processing

Concurrent modification of the same resource

JVM Structure and Garbage Collection

JVM Structure and Garbage Collection

Java application execution

Garbage collection

Managing Data in a Database

Managing Data in a Database

Creating a database

Creating a database structure

Connecting to a database

Releasing the connection

Network Programming

Network Programming

Network protocols

UDP-based communication

TCP-based communication

UDP versus TCP protocols

URL-based communication

Using the HTTP 2 Client API

Java GUI Programming

Java GUI Programming

Java GUI technologies

JavaFX fundamentals

Hello with JavaFX

Control elements

Section 3: Advanced Java

Section 3: Advanced Java

Functional Programming

Functional Programming

What is functional programming?

Standard functional interfaces

Lambda expression limitations

Method references

Java Standard Streams

Java Standard Streams

Streams as a source of data and operations

Stream initialization

Operations (methods)

Numeric stream interfaces

Parallel streams

Reactive Programming

Reactive Programming

Asynchronous processing

Non-blocking API

Reactive streams

Microservices

What is a microservice?

The size of a microservice

How microservices talk to each other

The reactive system of microservices

Java Microbenchmark Harness

Java Microbenchmark Harness

Creating a JMH benchmark

Running the benchmark

JMH benchmark parameters

JMH usage examples

A word of caution

Best Practices for Writing High-Quality Code

Best Practices for Writing High-Quality Code

Java idioms, their implementation, and their usage

Best design practices

Code is written for people

Testing is the shortest path to quality code

Java - Getting New Features

Java - Getting New Features

Java continues to evolve

Valhalla project

Assessments

Chapter 1 – Getting Started with Java 12

Chapter 2 – Java Object-Oriented Programming (OOP)

Chapter 3 – Java Fundamentals

Chapter 4 – Exception Handling

Chapter 5 – Strings, Input/Output, and Files

Chapter 6 – Data Structures, Generics, and Popular Utilities

Chapter 7 – Java Standard and External Libraries

Chapter 8 – Multithreading and Concurrent Processing

Chapter 9 – JVM Structure and Garbage Collection

Chapter 10 – Managing Data in a Database

Chapter 11 – Network Programming

Chapter 12 – Java GUI Programming

Chapter 13 – Functional Programming

Chapter 14 – Java Standard Streams

Chapter 15 – Reactive Programming

Chapter 16 – Microservices

Chapter 17 – Java Microbenchmark Harness

Chapter 18 – Best Practices for Writing High-Quality Code

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java.time package

There are many classes in the java.time package and its sub-packages. They were introduced as a replacement for other (older packages) that handled date and time. The new classes are thread-safe (hence, better suited for multithreaded processing) and what is also important is that they are more consistently designed and easier to understand. Also, the new implementation follows International Standard Organization (ISO) standards as regards the date and time formats, but allows any other custom format to be used as well.

We will describe the main five classes, and demonstrate how to use them:

java.time.LocalDate
java.time.LocalTime
java.time.LocalDateTime
java.time.Period
java.time.Duration

All these, and other classes of the java.time package, as well as its sub-packages, are rich in various functionality that cover all practical cases. But we are not going...