Java is an object-oriented language similar to C++, but it has so many unique features like inheritance,class and object.

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Features of Java
Technology

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Key Features of Java Technology
 Sun Microsystems has renamed the new J2 versions as Java SE, Java EE and Java ME respectively.
Java is guaranteed to be Write Once, Run Anywhere
Java is:
1. Object Oriented
2. Platform independent
3. Simple
4. Secure
5. Architectural- neutral
6. Portable
7. Robust
8. Multi-threaded
9. Interpreted
10.High Performance
11.Distributed
12.Dynamic

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Java Environment Setup
 Setting up the path for windows 2000/XP:
 Assuming you have installed Java in c:Program Filesjava JDK directory:
1. Right-click on 'My Computer' and select 'Properties'.
2. Click on the 'Environment variables' button under the 'Advanced' tab.
3. Now alter the 'Path' variable so that it also contains the path to the Java
executable. Example, if the path is currently set to 'C:WINDOWSSYSTEM32',
then change your path to read 'C:WINDOWSSYSTEM32;c:Program Filesjava
JDKbin'.
Popular Java Editors: 1. Notepad
2. Netbeans
3. Eclipse

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Java Basic Syntax
When we consider a Java program it can be defined as a collection of objects that
communicate via invoking each others methods. Inside Java Programs we have:
1. Object
2. Class
3. Methods
4. Instance Variables
About Java programs, it is very important to keep in mind the following points.
1. Case Sensitivity - Java is case sensitive which means identifier Hello and hello
would have different meaning in Java.
2. Class Names - For all class names the first letter should be in Upper Case.
If several words are used to form a name of the class each inner words first letter
should be in Upper Case.
Example class MyFirstJavaClass

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Java Basic Syntax
3. Method Names - All method names should start with a Lower Case letter.
If several words are used to form the name of the method, then each inner
word's first letter should be in Upper Case.
Example: public void myMethodName()
4. Program File Name - Name of the program file should exactly match the class
name.
When saving the file you should save it using the class name (Remember java is
case sensitive) and append '.java' to the end of the name. (if the file name and
the class name do not match your program will not compile).
Example : Assume ‘ MyFirstJavaProgram' is the class name. Then the file should
be saved as 'MyFirstJavaProgram.java'
5. public static void main(String args[]) - java program processing starts from the
main() method which is a mandatory part of every java program..

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Java Identifiers:
In java there are several points to remember about identifiers.
They are as follows:
1. All identifiers should begin with a letter (A to Z or a to z ),
currency character ($) or an underscore (_).
1. After the first character identifiers can have any combination of characters.
2. A key word cannot be used as an identifier.
3. Most importantly identifiers are case sensitive.
4. Examples of legal identifiers: age, $salary, _value, __1_value
5. Examples of illegal identifiers : 123abc, -salary

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Java Modifiers:
Like other languages it is possible to modify classes, methods etc
by using modifiers.
There are two categories of modifiers.
1. Access Modifiers : default, public , protected, private
2. Non-access Modifiers : final, abstract, strictfp

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Java Variables:
We would see following type of variables in Java:
1. Local Variables
2. Class Variables (Static Variables)
3. Instance Variables (Non static variables)
Comments in Java :
/* This is my first java program.
* This will print 'Hello World' as the output
* This is an example of multi-line comments. */
// This is an example of single line comment
/* This is also an example of single line comment. */

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Java Keywords:

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