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Java

 
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Learn Java - Learn Java Quickly

                         

Java is an object oriented programming language developed by Sun Microsystems. This is freely available to public for all purposes from personal website development to big enterprises. It looks lot like C and C++ but has various extra-developed features that make it safer, easier and more useful than other object oriented languages. It is now most demanded programming skill used for developing various web-based application in e-commerce and universities.

The most important feature of Java is that it can run on different types of computer without any modification. This feature is popularly known as “Write once, run anywhere”. Again, it is used widely with Server Side web programming, where the program runs on the web server and the user can see the page using any web browser.  Also programs developed by using Java technology can be sold without paying or consulting to the Sun Microsystems.

Java Virtual Machine (JVM)

It is the principal component of Java architecture that provides the cross platform functionality and security to Java. This is a software process that converts the compiled Java byte code to machine code. Byte code is an intermediary language between Java source and the host system.

Most programming language like C and Pascal translate the source code into machine code for one specific type of machine as the machine language vary from system to system. So most complier produce code for a particular system but Java compiler produce code for a virtual machine. The translation is done in two steps. First the programs written in Java or the source code translated by Java compiler into byte code and after that the JVM converts the byte code into machine code for the computer one wants to run.

So the programs files written in Java are stored in .java files and the .java files are compiled by the Java compiler into byte code that are stored in .class file. The JVM later convert it into machine code. In fact the byte code format is same on all platforms as it runs in the same JVM and it is totally independent from the operating system and CPU architecture. JVM is a part of Java Run Time Environment that is required by every operating system requires a different JRE. JRE consists of a number of classes based on Java API and JVM, and without JRE, it is impossible to run Java. So its portability really made it possible in developing write once and run anywhere software.

In the following figure you can see the function of JVM

How to write your First Java program

Ok, now you know the basics of Java programming and have downloaded the Java Development Kit (JDK), then its time to write your first Java program.

Create a source code program in any of the text editor available like jEdit, Notepad, TextPad etc. Java program is a class with a main method in it. The main method is the starting point for every Java application. So first define the class name and lets take it as FirstProgram and write it in the text editor like below

public class FirstProgram

{

     public static void main(String[] args)

     {

          System.out.println("Hey! you are going to compile and run your first Java program");

     }

}

Here System.out.println is the incantation that one uses to get codes sent to the console. Now save the file with same name as the public class just adding the extension “.java” . Here for example FirstProgram.java. If you use a different name other than the existing class name then you will face while compiling.

After completing the above, open a doss command window and type cd to the directory in which your source file exists. Type the following code to compile the file. This should be like this:

javac FirstProgram.java

If you compile it successfully, then you can find a class file in your directory with the same name, which is the bytecode form of Java program. Now type FirstProgram.java  to run the program.

The JVM now will run the bytecode in the FirstProgram.class file. Now you will see the output on your screen as:

Hey! you are going to compile and run your first Java program

Congratulation! Now you have successfully developed your first Java program. 

                         

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Current Comments

55 comments so far (post your own) View All Comments Latest 10 Comments:

plz send me the oop consepts then i can establish my programes quickly.

Posted by Roshan on Wednesday, 03.19.08 @ 15:50pm | #53312

Hi i m Beginner to JAVA so plz send me example so that i can learn it fast and easly .




thanks

Posted by Dinesh Kumar on Monday, 02.25.08 @ 18:03pm | #49965

can u pls tell me some of the good java books so that i can easily learn java.I wanted to do as many programs aas ic an to develop my logic..... pls help me...its really helpful because i am working in a s/w company and my platform is java....i hp that u will help me....

Posted by Mira on Monday, 02.4.08 @ 09:34am | #47157

hi,
The problem u are facing is coz u have not set the classpath after installing the jvm. u need to set the classpath of the bin directory in the enviorment variables so as to remove the error that it is not recognized as a external command. if u dont know how toset the classpath. u can tell me.

Posted by pranay on Wednesday, 01.30.08 @ 12:04pm | #46574

sir, iam learing advance java so i need study meterial for sevlets jsp,and struts. so, kindly send me meterial for sevlets jsp,and struts

Posted by arvind on Wednesday, 12.26.07 @ 14:10pm | #43830

even though i installed the jvm,iam unable to run a simple java program.

it is saying 'javac' is not recognised as an internal or external command,operable program or batch file.

Posted by anil on Monday, 12.17.07 @ 12:25pm | #42691

This is naveen
I no about Core java I want to Learn Advance java please send me some advance java Books Please
sir

Posted by Naveen on Monday, 12.10.07 @ 11:23am | #41714

core java metireal

Posted by kranti on Friday, 11.2.07 @ 14:54pm | #35398

Sir how can i make a setup file in java...

Posted by simeon on Saturday, 10.20.07 @ 08:36am | #34434

what are the topics that covers adv java

Posted by butul on Wednesday, 10.17.07 @ 19:50pm | #34290

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