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Learn Java 12 Programming
Learn Java 12 Programming

Learn Java 12 Programming: A step-by-step guide to learning essential concepts in Java SE 10, 11, and 12

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Learn Java 12 Programming

Getting Started with Java 12

This chapter is about how to start learning Java 12 and Java in general. We will begin with the basics, first explaining what Java is and its main terms, followed by how to install the necessary tools to write and run (execute) a program. In this respect, Java 12 is not much different to the previous Java versions, so this chapter's content is applies to the older versions too.

We will describe and demonstrate all the necessary steps for building and configuring a Java programming environment. This is the bare minimum that you have to have on the computer in order to start programming. We also describe the basic Java language constructs and illustrate them with examples that can be executed immediately.

The best way to learn a programming language, or any language for that matter, is to use it, and this chapter guides the reader on how they can...

How to install and run Java

When somebody says "Java," they may mean quite different things:

  • Java programming language: A high-level programming language that allows an intent (a program) to be expressed in a human-readable format that can be translated in the binary code executable by a computer
  • Java compiler: A program that can read a text written in the Java programming language and translate it into a bytecode that can be interpreted by Java Virtual Machine (JVM) in the binary code executable by a computer
  • Java Virtual Machine (JVM): A program that reads a compiled Java program and interprets it into the binary code that is executable by a computer
  • Java Development Kit (JDK): The collection of programs (tools and utilities), including Java compiler, JVM, and supporting libraries, which allow the compilation and execution of a program written in the Java language...

How to install and run an IDE

What used to be just a specialized editor that allowed checking the syntax of the written program the same way a Word editor checks the syntax of an English sentence gradually evolved into an Integrated Development Environment (IDE). This bears its main function in the name. It integrates all the tools necessary for writing, compiling, and then executing a program under one Graphical User Interface (GUI). Using the power of Java Compiler, the IDE identifies syntax errors immediately and then helps to improve code quality by providing context-dependent help and suggestions.

Selecting an IDE

There are several IDEs available for a Java programmer, such as NetBeans, Eclipse, IntelliJ IDEA, BlueJ...

Java primitive types and operators

With all the main programming tools in place, we can start talking about Java as a language. The language syntax is defined by Java Language Specification, which you can find on https://docs.oracle.com/javase/specs. Don't hesitate to refer to it every time you need some clarification. It is not as daunting as many people assume.

All the values in Java are divided into two categories: reference types and primitive types. We start with primitive types and operators as the natural entry point to any programming language. In this chapter, we will also discuss one reference type called String (see the String type and literals section).

All primitive types can be divided into two groups: the boolean type and the numeric types.

Boolean type

...

String types and literals

We have just described the primitive value types of the Java language. All the other value types in Java belong to a category of reference types. Each reference type is a more complex construct than just a value. It is described by a class, which serves as a template for creating an object, a memory area that contains the values and methods (the processing code) defined in the class. An object is created by the new operator. We will talk about classes and objects in more detail in Chapter 2, Java Object-Oriented Programming (OOP).

In this chapter, we will talk about one of the reference types called String. It is represented by the java.lang.String class, which belongs, as you can see, to the most foundational package of JDK, java.lang. The reason we introduce the String class that early is that it behaves in some respects very similar to primitive types...

Identifiers and variables

From our school days, we have an intuitive understanding of what a variable is. We think of it as a name that represents a value. We solve problems using such variables as x gallons of water or n miles of a distance, and similar. In Java, the name of a variable is called an identifier and can be constructed by certain rules. Using an identifier, a variable can be declared (defined) and initialized.

Identifier

According to Java Language Specification (https://docs.oracle.com/javase/specs), an identifier (a variable name) can be a sequence of Unicode characters that represent letters, digits 0-9, a dollar sign ($), or an underscore (_).

Other limitations are as follows:

  • The first symbol of an identifier...

Java statements

A Java statement is a minimal construct that can be executed. It describes an action and ends with a semicolon (;). We have seen many statements already. For example, here are three statements:

float f = 23.42f;
String sf = String.valueOf(f);
System.out.println(sf);

The first line is a declaration statement combined with an assignment statement. The second line is also a declaration statement combined with an assignment statement and method invocation statement. The third line is just a method invocation statement.

Here is the list of Java statement types:

  • An empty statement that consists of only one symbol, ; (semicolon)
  • A class or interface declaration statement (we will talk about this in Chapter 2, Java Object-Oriented Programming (OOP))
  • A local variable declaration statement: int x;
  • A synchronized statement: this is beyond the scope of this book
  • An expression...

Summary

This chapter introduced you to the exciting world of Java programming. We started with explaining the main terms, and then explained how to install the necessary tools, JDK and IDE, and how to configure and use them.

With a development environment in place, we provided the reader with the basics of Java as a programming language. We have described Java primitive types, the String type, and their literals. We have also defined what an identifier is, and what a variable is, and finished with a description of the main types of Java statements. All the points of the discussion were illustrated by the specific code examples.

In the next chapter, we are going to talk about the object-oriented aspects of Java. We will introduce the main concepts, explain what a class is, what an interface is, and the relationship between them. The terms overloading, overriding, and hiding will...

Quiz

  1. What does JDK stand for?
    1. Java Document Kronos
    2. June Development Karate
    3. Java Development Kit
    4. Java Developer Kit
  1. What does JCL stand for?
    1. Java Classical Library
    2. Java Class Library
    3. Junior Classical Liberty
    4. Java Class Libras
  1. What does Java SE stand for?
    1. Java Senior Edition
    2. Java Star Edition
    3. Java Structural Elections
    4. Java Standard Edition
  1. What does IDE stand for?
    1. Initial Development Edition
    2. Integrated Development Environment
    3. International Development Edition
    4. Integrated Development Edition
  1. What are Maven's functions?
    1. Project building
    2. Project configuration
    3. Project documentation
    4. Project cancellation
  1. What are Java primitive types?
    1. boolean
    2. numeric
    3. integer
    4. string
  1. What are Java primitive types?
    1. long
    2. bit
    3. short
    4. byte
  1. What is a literal?
    1. A letter-based string
    2. A number-based string
    3. A variable representation
    4. A value representation...
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Key benefits

  • Strengthen your knowledge of important programming concepts and the latest features in Java
  • Explore core programming topics including GUI programming, concurrency, and error handling
  • Learn the idioms and best practices for writing high-quality Java code

Description

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.

Who is this book for?

Students, software developers, or anyone looking to learn new skills or even a language will find this book useful. Although this book is for beginners, professional programmers can benefit from it too. Previous knowledge of Java or any programming language is not required.

What you will learn

  • Learn and apply object-oriented principles
  • Gain insights into data structures and understand how they are used in Java
  • Explore multithreaded, asynchronous, functional, and reactive programming
  • Add a user-friendly graphic interface to your application
  • Find out what streams are and how they can help in data processing
  • Discover the importance of microservices and use them to make your apps robust and scalable
  • Explore Java design patterns and best practices to solve everyday problems
  • Learn techniques and idioms for writing high-quality Java code
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Publication date : Apr 30, 2019
Length: 690 pages
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Language : English
ISBN-13 : 9781789957051
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Product Details

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Length: 690 pages
Edition : 1st
Language : English
ISBN-13 : 9781789957051
Category :
Languages :

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Table of Contents

24 Chapters
Section 1: Overview of Java Programming Chevron down icon Chevron up icon
Getting Started with Java 12 Chevron down icon Chevron up icon
Java Object-Oriented Programming (OOP) Chevron down icon Chevron up icon
Java Fundamentals Chevron down icon Chevron up icon
Section 2: Building Blocks of Java Chevron down icon Chevron up icon
Exception Handling Chevron down icon Chevron up icon
Strings, Input/Output, and Files Chevron down icon Chevron up icon
Data Structures, Generics, and Popular Utilities Chevron down icon Chevron up icon
Java Standard and External Libraries Chevron down icon Chevron up icon
Multithreading and Concurrent Processing Chevron down icon Chevron up icon
JVM Structure and Garbage Collection Chevron down icon Chevron up icon
Managing Data in a Database Chevron down icon Chevron up icon
Network Programming Chevron down icon Chevron up icon
Java GUI Programming Chevron down icon Chevron up icon
Section 3: Advanced Java Chevron down icon Chevron up icon
Functional Programming Chevron down icon Chevron up icon
Java Standard Streams Chevron down icon Chevron up icon
Reactive Programming Chevron down icon Chevron up icon
Microservices Chevron down icon Chevron up icon
Java Microbenchmark Harness Chevron down icon Chevron up icon
Best Practices for Writing High-Quality Code Chevron down icon Chevron up icon
Java - Getting New Features Chevron down icon Chevron up icon
Assessments Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

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Full star icon Full star icon Full star icon Half star icon Empty star icon 3.7
(6 Ratings)
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AABarnes Mar 30, 2021
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
This book is organized like a high-level reference. It is not setup to teach simple basics and then build from there. The examples are over complicated for the concept being discussed and there is no explanations included - just an information dump. The questions in the Quiz section are not always clear either.
Amazon Verified review Amazon
Sergio Peris Mar 19, 2021
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Este libro es la perfecta guia para aquellas personas que estan aprendiendo Java.Ademas el libro habla muy detalladamente de todas las posibilidades de Java y explica el codigo.Recomiendo este libro para todos los que deseen aprender Java.Ah! Una cosa, el libro esta escrito en ingles.
Amazon Verified review Amazon
Pedro Mar 14, 2021
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
This book is not to grab it and start coding JAVA... This book is an absolute reference guide and nothing else. If you want to get your hands dirty with code, this book is not for you. If you want to review JAVA concepts and see SNIPPETS, yes, SNIPPETS with minimal effort of separating them and preparing the reader to see code, then... go for it. I give it a 2 because I have to admit it has good points on theory, but in code, na-ah. My suggestion, get another book to learn to code...
Amazon Verified review Amazon
Ramona Dec 23, 2020
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Acquistato per mio marito, che è autodidatta. Finora è contento della qualità del prodotto a livello complessità e accessibilità.
Amazon Verified review Amazon
Simone Nov 06, 2020
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Sicuramente è un ottimo libro, copre tutto quanto c'è da sapere sulla programmazione java di base. Do base ma non troppo in quanto credo che molte delle cose scritte su questo libro non le sappiano neanche i più senior. Ottimo per dare una bella rinfrescata a quanto studiato ed acquisito con l'esperienza.
Amazon Verified review Amazon
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