Advanced Java Tutorial Book PDF Free Download
How to create and destroy objects In JAVA
1.1 Introduction Java programming language, which originated in Sun Microsystems and was released back in 1995, is one of the most widely used pro gramining 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 due to its powerful library and runtime, simple syntax, rich set of sup ported platforms (Write Once, Run Anywhere – WORA) and awesome community.
In this tutorial we are going to cover advanced Java concepts, assuming that our readers already have some basic knowledge of the language.
It is by no means a complete reference, rather a detailed guide to moving your Java skills to the next level.
Along the course, there will be a lot of code snippets to look at. Where it makes sense, the same example will be presented using Java 7 syntax as well as Java 8 one.
1.2 Instance Construction Java is an object-oriented language and as such the creation of new class instances (objects) is, probably, the most important concept of it.
Constructors are playing a central role in new class instance initialization and Java provides a couple of favors to define them.
1.2.1 Implicit (Generated) Constructor Java allows to define a class without any constructors but it does not mean the class will not have any. For example, let’s consider this class:
In this case, when a class instance is being created using the new keyword, both constructor arguments should be provided.
Interestingly, the constructors can call each other using the special this keyword.
It is considered a good practice to chain constructors in such a way as it reduces code duplication and basically leads to having a single initialization entry point.
As an example, let us add another constructor with only one argument.
| Writer | Andriy Redko |
| Language | English |
| Pages | 124 |
| Pdf Size | 0.85 MB |
| Category | Computer |
| Sources | enos.itcollege.ee |
Advanced Java Tutorial PDF Free Download