How to tell if a java application was invoked with 'java' or 'javaw'

[Michael]

Is it possible for a 'main' function to tell if java was invoked with
'java' or 'javaw'?

Thanks,

 

[Andrew Thompson]

Is it possible for a 'main' function to tell if java was invoked with
'java' or 'javaw'?

Sure, feed it an argument.

But what about if it's invoked by double clicking a Jar file, or by JWS?
What if it is instantiated by an applet?

What is the actual problem you are trying to solve here?
What do you hope to achieve by knowing?

 

[Boudewijn Dijkstra]

Is it possible for a 'main' function to tell if java was invoked with
'java' or 'javaw'?

It could be that the standard streams are different.

 

[Michael]

The 'main' method needs to know if it can use System.out or not.
There are at least three alternatives:

- Have two differnet 'main' methods.
- Use a command line argument.
- Have the 'main' method figure it out.

The first two options require more cooperation from the user.

 

[Andrew Thompson]

...
The 'main' method needs to know if it can use System.out or not.

It can, in every circumstance.
java, javaw, jar/no jar, JWS, applet..

You can redirect the System.error and System.out to a file
and throw it up in a JOptionPane if it is all so fired
important to the user.

But if this information is so vital to the end user, why
are you writing it it System.out in the first place?

[ ..and please quote a little of what you are replying to,
to supply a context to the reader. ]