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Java Tutorial
Tutorialspoint.com
Java is a high-level programming language originally developed by Sun Microsystems
and released in 1995.
Java runs on a variety of platforms, such as Windows, Mac OS, and the various
versions of UNIX. This tutorial gives an initial push to start you with Java. For more
detail kindly check tutorialspoint.com/java
What is Java?
Java is:
Object Oriented
Platform independent:
Simple
Secure
Architectural- neutral
Portable
Robust
Multi-threaded
Interpreted
High Performance
Distributed
Dynamic
Java Environment Setup:
Java SE is freely available from the link Download Java. So you download a version based on
your operating system.
You can refere to installation guide for a complete detail.
Java Basic Syntax:
Object - Objects have states and behaviors. Example: A dog has states-color, name,
breed as well as behaviors -wagging, barking, eating. An object is an instance of a
class.
Class - A class can be defined as a template/ blue print that describe the
behaviors/states that object of its type support.
Methods - A method is basically a behavior. A class can contain many methods. It is in
methods where the logics are written, data is manipulated and all the actions are
executed.
Instant Variables - Each object has its unique set of instant variables. An object.s
state is created by the values assigned to these instant variables.
First Java Program:
Let us look at a simple code that would print the words Hello World.
public class MyFirstJavaProgram{