Advanced Java Programming Tutorial PDF

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How To create And Destroy Objects In JAVA

Introduction The Java programming language, which originated at Sun Microsystems and was released in 1995, is one of the most widely used programming languages in the world, according to the TIOBE Programming Community Index.

Java is a general purpose programming language.

It is attractive to software developers primarily because of its powerful library and runtime, simple syntax, rich set of supported platforms (Write Once, Run Anywhere – WORA) and wonderful community.

In this tutorial we are going to cover advanced Java concepts, assuming that our readers already have some basic knowledge of the language.

This is by no means a complete reference, but rather a comprehensive guide to taking your Java skills to the next level.

Throughout the course, there will be lots of code snippets to look at. Where it makes sense, the same examples will be presented using Java 7 syntax as well as the Java 8 one.

1.2 Instance Creation Java is an object-oriented language and thus the creation of new class instances (objects) is, perhaps, its most important concept.

Constructors play a central role in new class instance initialization and Java provides some facilities to define them.

1.2.1 Implicit (Generated) Constructor Java allows to define a class without any constructor but it does not mean that the class will not have any constructor. For example, let’s consider this class:

In this case, both the constructor arguments must be provided when a class instance is being created using the new keyword.

Interestingly, the constructors can call each other using the special this keyword.

It is considered a good practice to chain constructors as it reduces code duplication and basically leads to a single initialization entry point.

As an example, let us add another constructor with only one argument.

Whatever programming language you’re using (and Java is not an exception here), following good design principles is a great way to write clean, understandable, testable code and provide a long-lasting, easy-to-maintain solution. important factor.

In this part of the tutorial, we are going to discuss the basic building blocks that the Java language provides and introduce some design principles, which aim to help you make better design decisions.

More precisely, we are going to discuss interfaces and interfaces with default methods (new feature of Java 8), abstract and final classes, immutable classes, inheritance, composition and a little bit again on visibility (or access) rules. Let’s look at those we’ve only partially touched on. Tutorial 1, How to Create and Destroy Objects

WriterAndriy Redko
Pdf Size0.85 MB


Advanced Java Tutorial PDF Free Download

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