How do I do system() in Java?

How do I use the C++ command system() in Java? I have a basic idea and this is what I have so far:





import java.lang.Runtime;





class PassCommand {


public static void PassToSystem(String[] command) {


Runtime runtime = Runtime.getRuntime();


try {


Process p = runtime.exec(command);


} catch(Exception e) {


System.out.println("Process failed: " + e.getMessage());


}


}


public static void main(String[] args) {


PassToSystem(args[0]);


}


}





But when I try to run it, this is what it gives me (I gave it the argument pause):





Process failed: Cannot run program "pause": CreateProcess error=2, The system cannot find the file specified

How do I do system() in Java?
"pause" is not the name of a program - it is a Windows batch language command understood by cmd.exe.





You need to pass "cmd /c pause" to run batch commands like "pause". You might also want to pass 'args' to your function to handle multi-word commands - not 'args[0]'





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And this answer brings me to Level 6 !! Cheers !





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Well, "cmd /c cls" is not supposed to do anything - it is completely useless command. What exactly did you try to achieve ?





"cls" clears the screen which is invisible in case of Runtime.exec() and exists only for the duration of cmd process.





If you want to spawn separate command shell in a new window detached from your Java program, you need to do something like this:





"cmd /c start cmd /k echo This is new Window"





This web site provides good information about Windows shell (cmd):


http://www.ss64.com/nt/cmd.html
Reply:Firstly, you are passing a single string in when you say the input is supposed to be an array. Furthermore, you have to define an array size. You cannot leave it open like that.

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