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program vs VM arguments

Posted on 2014-01-31
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Last Modified: 2014-02-03
Hi,

i am looking into below program.

As in the screenshot

http://www.avajava.com/tutorials/lessons/how-do-i-set-system-properties.html?page=2

VM arguments author passing
-Dfavorite.day=Saturday -Dfavorite.car="Nissan 350Z"


My question can i pass them instead of VM arguments as program arguments text box(the one above VM arguments)
What are advantages, disadvantages of each of them.
please advise
Any links resources ideas highly appreciated. Thanks in advance
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Question by:gudii9
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Expert Comment

by:rrz
ID: 39825224
Yes, you can pass them as program arguments.  
To read them you would use something like  
String  favoriteDay  = args[0];
String favoriteCar  = args[1];    
that is purposeof args[] in the line  
      public static void main(String[] args) {
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by:gudii9
ID: 39825263
What are differneces, advantages, disadvantages of VM and System Arguments
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Expert Comment

by:rrz
ID: 39825307
I guess you read in the same web site  
http://www.avajava.com/tutorials/lessons/whats-the-difference-between-program-arguments-and-vm-arguments.html       
System arguments apply to the system.
Program arguments apply to your specific program.  
It all depends on what you trying to do.    
Hopefully an expert will have some more to say about it.
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Assisted Solution

by:Mahesh Bhutkar
Mahesh Bhutkar earned 150 total points
ID: 39828872
Program arguments are arguments passed to your program and available in the args array of your main method.
public static void main(String[] args)

VM arguments are passed to the virtual machine. They can be accessed by program via a call to System.getProperty().
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by:gudii9
ID: 39829839
which one is preferred to use in which case. please advise. why do we need to pass to virtual machine.what is the use case / practical use for that.
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Accepted Solution

by:
rrz earned 350 total points
ID: 39829965
>which one is preferred to use in which case    
In the code you linked to at the top, it is a  kind of  a misuse to set system properties for parameters that will be used in just one class.
The Java platform itself uses a Properties object to maintain its own configuration. The System class maintains a Properties object that describes the configuration of the current working environment. System properties include information about the current user, the current version of the Java runtime, and the character used to separate components of a file path name.
that is a quote from  
http://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html   
On that page, you can see commonly used system properties.
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