runtime.exec()

[amit bhadre]

In JNI to run class file in any OS we use runtime.exec() method ...told.

How to use it and when to use?

[Henry Wong]

Originally posted by amit bhadre:
In JNI to run class file in any OS we use runtime.exec() method ...told.

How to use it and when to use?

Not really sure what you are asking... so apologies if this doesn't apply.

JNI and Runtime.exec() are two different things. JNI is used to interface to a native library -- a DLL for Windows and a shared library for Unix. And Runtime.exec() is a method that allows you to call a program in the OS.

The only relation that I can think of is... maybe Runtime uses JNI under the covers. For you, you should use JNI, if you have a library that you need to interface to, and Runtime.exec(), if you have a program that you want to call.

Henry

[amit bhadre]

Hello sir I am glad to receive such responses from... really sir.

exicited...

As u told now that Runtime.exec() is a method that allows you to call a program in the OS.

So if want run a class file then I can use this method sir? If so how please tel me with e.g...

Or can I call like this

Object o=null;
o=runtime.exec(a);

Here 'a' may be any class name... is it gives the output of that class file sir, here 'a'.

Thanking u in advance ....

[Ulf Dittmer]

Runtime.exec is for executing system commands (which you would normally enter on the command line).

If you want to "run" class files, why don't you instantiate the class, and call its methods as appropriate?

Or are you talking about running a Java application, like "java -classpath ... MyJavaClass"? Then Runtime.exec is for you, although it has caveats to be aware of.
[ February 20, 2006: Message edited by: Ulf Dittmer ]