Hi M M
You can compile any .java file with "javac". By default, the .class
generated file is stored in the same directory as the original .java file.
For e.g.:
> cd E:\workspace\pkg\src
> javac hellp.java
... or, with the same results:
> javac E:\workspace\pkg\src
Both "javac" commands produce the file *E:\workspace\pkg\src*\/hello.class/
But when executing the .class file things are different. The .class file
"knows" it belongs to the package "haaa". It means the path
"haaa/hello.class" must be found in one of the classpath entries
For e.g.:
> java -cp E:\workspace\pkg\src haaa.hello
... will wok only if the compiled file is
*E:\workspace\pkg\src\*haaa\/hello.class/
So, in order to get working, it is a good idea to store files in
directory tree-like hierarchy according to the packages (NetBeans and
Eclipse automatically take care of this). For e.g.:
-- put your file in *E:\workspace\pkg\src*\haaa
-- compile it like:
> cd E:\workspace\pkg\src
> javac haaa\hello.java
-- execute it like:
> java -cp *E:\workspace\pkg\src* haaa.hello
Hope it helps
mihai
M M a écrit :
> I have a java file named hello.java which is given below:-
>
> package haaa;
> class hello
> {
> public static void main(String [] args)
> {
> System.out.println("Hello");
> }
> }
>
>
> I am using Windows XP. In my system, CLASSPATH is set to "E:\workspace
> \pkg\src". Initially, the file is present in the folder "E:\workspace
> \pkg\src\". When I tried to compile it, there was no error. But when I
> tried to execute the command,
>
> java haaa.hello
>
> then it returned an error like this:-
>
> Exception in thread "main" java.lang.NoClassDefFoundError: haaa/hello
>
> Caused by: java.lang.ClassNotFoundException: haaa.hello
> at java.net.URLClassLoader$1.run(Unknown Source)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(Unknown Source)
> at java.lang.ClassLoader.loadClass(Unknown Source)
> at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
> at java.lang.ClassLoader.loadClass(Unknown Source)
> at java.lang.ClassLoader.loadClassInternal(Unknown Source)
> Could not find the main class: haaa.hello. Program will exit.
>
> Could you please help me correct the error.
>
> Also, my system has a Linux OS. In Linux OS, whenever I compile and
> execute java programs in Eclipse IDE, then it goes smoothly. But when
> I try to compile in terminal using javac command then it tells that
> "no such command found". For setting PATH variable in Linux, I need to
> know where javac file is located. But I searched everywhere in Linux
> using File Search facility. So, why is there a difference between
> Eclipse IDE and terminal? I need your help desperately.
>
> >
>
>
>
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