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.
Table of Contents (25 chapters)
Free Chapter
1
Section 1: Overview of Java Programming
5
Section 2: Building Blocks of Java
15
Section 3: Advanced Java

Class

Java program is a sequence of statements that express an executable action. The statements are organized in methods, and methods are organized in classes. One or more classes are stored in .java files. They can be compiled (transformed from the Java language into a bytecode) by the Java compiler javac and stored in .class files. Each .class file contains one compiled class only and can be executed by JVM.

A java command starts JVM and tells it which class is the main one, the class that has the method called main(). The main method has a particular declaration: it has to be public static, must return void, has the name main, and accepts a single parameter of an array of a String type.

JVM loads the main class into memory, finds the main() method, and starts executing it, statement by statement. The java command can also pass parameters (arguments) that the main() method...