CONSTRUCTOR AND THIS KEYWORD

CONSTRUCTOR

DEFINITION :  Constructor in java is a special type of method that is used to initialize the object. It has same name as that of Class.

PROPERTIES OF CONSTRUCTOR :

1. Called only once.
2. No return type.
3. Same name as that of Class.

 This Keyword

this  is a keyword in Java. It can be used inside the Method or constructor of  Class. It(this) works as a reference to the current Object whose Method or constructor is being invoked.

INTRODUCTION TO JAVA

JAVA

Java is a simple and powerful Object Oriented Programming  (OOP) language and it is in many respects similar to C++. Basically , it was developed to provide a platform-independent programming language.

FEATURES OF JAVA

Important features of java are stated  bellow :

• SIMPLE : Java is very simple language as it is easy to learn and its syntax is quite simple, clean and easy to understand. The ambiguous concepts of C++ has been completely eliminated in Java so as to make it simple.
• OBJECT-ORIENTED : In java everything is Object which has some data and behaviour.
• PLATFORM INDEPENDENT :  The most important feature of Java is that java program can run on any Operating system.  It is platform independent because java code (.class file) is executed by JVM (Java Virtual Machine) and not by OS directly.
• ARCHITECTURAL NEUTRAL : Java is architectural neutral because it  can run on any available processors .
• PORTABLE : Java code is portable as we can carry bytecode (.class file) to any platform.
• ROBUST : Compile time error checking and runtime checking (Exception handling) makes Java robust language.
• SECURE : Java program always runs in Java runtime environment (JRE) with almost no interaction with OS, hence it is more secure.
• MULTITHREADING : Java multithreading feature makes it possible to write program that can do many tasks simultaneously. Multiple threads execute concurrently.