Can I execute a cmd command through java?

Question

I am making a program that needs some of the Java libraries installed already into the computer and also the "classpath" environment variable to be set.

I want to run the set classpath command. Can I do it through java? Or do I need to do something else? Any Example?

You can use Runtime.getRuntime().exec("<command>") to execute commandline commands. But i'm not sure if this is really what you want to do.. — micha
– micha, Commented Dec 18, 2012 at 10:49
try java -classpath .;myjar.jar;lib/referenced-class.jar my.package.MainClass — Mohammod Hossain
– Mohammod Hossain, Commented Dec 18, 2012 at 10:50

Matthijs Bierman · Accepted Answer · 2012-12-18 10:49:46Z

2

If you want to set a system property, you can use System.setProperty(key,value).

answered Dec 18, 2012 at 10:49

Matthijs Bierman

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4 Comments

Soul Enrapturer Over a year ago

I think that was what I needed-So I know now that Environment variables can be changed without running cmd command in Java.Thanks

Matthijs Bierman Over a year ago

Just know that these properties are not global. See this answer: stackoverflow.com/a/908965/226449

Soul Enrapturer Over a year ago

Do you mean the environment variable that i have changed won't have a changed value in another program that I later or in parallel run on that machine?What about if I have multiple threads in a process?Will it be working there too?

Matthijs Bierman Over a year ago

Another JVM/process will not have the changed value, correct. Within the same process (i.e. another thread) it will show the changed value.

NiranjanBhat · Accepted Answer · 2012-12-18 10:49:44Z

2

All you need is ProcessBuilder

answered Dec 18, 2012 at 10:49

NiranjanBhat

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Comments

duffymo · Accepted Answer · 2012-12-18 10:50:40Z

2

Yes, you can. Here's are some examples to show you how to do it:

http://www.javaworld.com/jw-12-2000/jw-1229-traps.html

http://www.ehow.com/way_5660016_java-runtime-exec-tutorial.html

answered Dec 18, 2012 at 10:50

duffymo

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Comments

acostache · Accepted Answer · 2012-12-18 10:59:24Z

2

Something like

public static void main(String[] args)
{
    try
    {
        if (args == null || (args != null && args.length != 1)) 
        {
        System.out.println("Please provide a command");
        }
        Runtime.getRuntime().exec(args);
    } 
    catch (Exception ex) 
    {
        ex.printStackTrace();
    }
}

answered Dec 18, 2012 at 10:59

acostache

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Comments

Philipp · Accepted Answer · 2012-12-18 10:49:59Z

1

set.exe is a program like any other. You can start it with Runtime.exec().

answered Dec 18, 2012 at 10:49

Philipp

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