Concepts and Code for U: Public static void main (String args[])

Friday, March 10, 2006

Public static void main (String args[])

The public keyword is an access specifier, which allows the programmer to control the visibility of class members. When a class member is preceded by public, then that member may be accessed by code outside the class in which it is declared.In this case, main( ) must be declared as public, since it must be called by code outside of its class when the program is started. The keyword static allows main( ) to be called without having to instantiate a particular instance of the class. This is necessary since main( ) is called by the Java interpreter before any objects are made. The keyword void simply tells the compiler that main( ) does not return a value. As you will see, methods may also return values.
As stated, main( ) is the method called when a Java application begins. Keep in mind that Java is case-sensitive. Thus, Main is different from main. It is important to understand that the Java compiler will compile classes that do not contain a main( ) method. But the Java interpreter has no way to run these classes. So, if you had typed Main instead of main, the compiler would still compile your program. However, the Java interpreter would report an error because it would be unable to find the main( ) method.
Any information that you need to pass to a method is received by variables specified within the set of parentheses that follow the name of the method. These variables are called parameters. If there are no parameters required for a given method, you still need to include the empty parentheses. In main( ), there is only one parameter, albeit a complicated one. String args[ ] declares a parameter named args, which is an array of instances of the class String. Objects of type String store character strings. In this case, args receives any command-line arguments present when the program is executed.

5:04 AM | Permalink

nice info .. thnks

Posted by N!T!N | 9:39 PM

Yes Indeed Nice & Detailed info! Thanks :)

Posted by Mudasser Arshed | 10:53 PM

This comment has been removed by the author.

Posted by Unknown | 2:01 AM

really nice info.....my doubt got clarified..thanks

Posted by Unknown | 2:04 AM

this didn't help at all. why don't programmers speak in ways i can understand...

Posted by oneofthree | 7:35 AM

The keyword static allows main( ) to be called without having to instantiate a particular instance of the class.

Wht u understand by the given statement..???
Wht u understand by the instance of the class????

Kindly reply me asap vishalb1204@gmail.com

Posted by Vishal | 9:05 AM

It was nice n detailed........thnks

Posted by Unknown | 8:41 PM

thanks for this useful info

Posted by Unknown | 9:06 AM

Thanks men, i was a c++ guy and was wondering what the hell all these details were, i think this will give me a headstart with java, edu

Posted by jumbeb | 10:05 PM

it's good info

Posted by chandu | 3:08 AM

Nice information!!!

Posted by Unknown | 2:44 AM

Thank U...

Posted by chiri | 4:24 AM

really nice

Posted by Unknown | 1:19 AM

Well framed!!!

Posted by Unknown | 11:00 PM

i gives very important info.

Posted by Pankaj Mishra | 11:10 PM

excelent information

Posted by azaman4u | 5:02 AM

Im a beginner for JAVA.
This is so useful and easily to understand. thanks for the info =)

Posted by -JesSie- ｡◕‿-｡ | 6:57 AM

this is what many books hane failed to write,indeed a great note.

Posted by harshal | 10:54 AM

nice piece if info.
thanx...

Posted by Anonymous | 9:24 PM

it was a very useful info..thanks

Posted by Unknown | 9:43 AM

thanks nic info:)

Posted by prince2810 | 6:56 AM

It is very useful for java learners..............thanQ

Posted by Unknown | 12:10 AM

It is very useful for java learners..............thanQ

Posted by Unknown | 12:11 AM

It is very useful for java learners..............thanQ

Posted by Unknown | 12:11 AM

good one dude..!!

Posted by Unknown | 9:36 PM

good details dude.

Posted by Shikku | 3:11 AM

why execution of prograam start from main method?and why main is public

Posted by Hazaribagh Jharkhand | 8:07 PM

why execution of prograam start from main method?and why main is public

Posted by Hazaribagh Jharkhand | 8:07 PM

informative blog......keep it up

Posted by anand | 1:17 AM

nice....
but I cant understand that why we cant pass arguments as 'int' or 'char' or anyother and only 'String' ?
Please reply on shashwat.mehta91@gmail.com

Posted by Shashwat Mehta | 2:27 AM

thanks for the info..it would be more helpful if i come to know the use of 'String args[]'...

Posted by equestionpapers | 7:34 AM

thanks for the info...it would be more helpful if i come to know the use of 'String[] args'

Posted by equestionpapers | 7:35 AM

y string s used in command line,instead of string while we use int,float we are getting error report,why?

Posted by VannaNilavan | 8:04 PM

copied from complete reference book of herbert....but thx.....Read books guys

Posted by ykey | 11:42 PM

it is very use full to understand the necessity of public before main method. Thank you:>>

Posted by jailani | 1:52 AM

use full information for java beginners