i am new to java.
ihave done c++ where main() is written out side of the class where in java main() should be inside the class u create i wounder what is reason for this?
which is the best book for beginners?
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there's no stand-alone method in Java. Every method, variable and constant are in classes. So main() should be inside a class :) even if it doesn't need anything from the class.
I think you can download "Thinking in Java":
http://sunsite.sut.ac.jp/j
(pdf and rtf versions)
C++ was designed to be backward compatible with C, so a non OOP program can pass easily thru a C++ compiler.
Java is completely OOPy ,everything is in classes or interfaces.
It somewhat forces you to write OOPy programs
Also everything is a Object except for the primitive types ,which are int ,byte ,boolean,long etc...
So the main() method is in some class and in fact you can have a main() method for ALL Java classes including applets (then it is used for testing pruposes)
What u do is designate some class as your starter class and
compile it using
javac MyMainClass.java
execute it using
java MyMainClass
Yes ,Bruce Eckel's book is good.you could also try
http://www.itlibrary.com
click around for atleast 20 free online books.
The main() is like any other class method. BUT, it has a specific type signature (public static void main(String[] a)) that the JVM interprets in a special way, as a main program. In fact, your question relates strongly to what the 'static' mean in Java, as static does not need an object in order to be called. So, do read these books.
Cheers,
Nik
The source code of a Java appication comprises of several .java files. Each file can contain at most one 'public class'. It is quite normal as a programmer to put one class per file.
Each public class can have a method that have the signature of a main(...).
When you start a Java application you provide to the java interpreter the name of the 'main' class. That is the application class whose main() will be called.
The interpreter does not make an instance of this class, as no instances are needed to call static methods. It is then up to the programmer to put object construction in the main(), GUI calls, thread spawning, etc.
In case of an applet, no main is called but init(), and then start().
Cheers,
Nikolay
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by: BugLighterPosted on 1999-10-06 at 23:59:40ID: 2105744
Hi AmitD,
Java is an object oriented language, there for its world is an all(*) objects
world. a method main(string[]) is an object's method.
As for books:
1) Java in a nut shell - David Flanagan.
2) Thinking in java - B.Eckel. - it is published on line at http://www.mindview.net/TI
Good Luck!