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Java Discussion Thread
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Sep 23rd, 2009

Windows command from within my Java program.

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Hi all,

I am trying to execute a windows command from within my java program, but I can't get it to execute the DOS command. Here's my code:

java Syntax (Toggle Plain Text)
try {
    Process p = Runtime.getRuntime().exec("cmd.exe /C cls");
} catch (IOException e) {
    // catch exception
}
try {
    Process p = Runtime.getRuntime().exec("cmd.exe /C cls");
} catch (IOException e) {
    // catch exception
}

But, the code doesn't clear the screen, nor it gives any error. Can you please let me know, what I am doing wrong here?

Thanks,

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new_2_java

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Junior Poster

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since Apr 2007

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Sep 23rd, 2009

Re: Windows command from within my Java program.

What are you expecting it to do? That command isn't going to produce any noticeable output.

Ezzaral

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Posting Genius

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since May 2007

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Sep 23rd, 2009

Re: Windows command from within my Java program.

Try to create the process using the ProcessBuilder class:

Java Syntax (Toggle Plain Text)
ProcessBuilder pb= new ProcessBuilder(command);
Process proc= pb.start();
ProcessBuilder pb= new ProcessBuilder(command);
Process proc= pb.start();

"command" is a list of Strings. For Windows it should look like this:

Java Syntax (Toggle Plain Text)
String[] command= { "cmd", "/C" , "dir" };
String[] command= { "cmd", "/C" , "dir" };

Additional:
After you create the output, you can obtain a stream of data from the process object itself:

Java Syntax (Toggle Plain Text)
Scanner sc= new Scanner(proc.getInputStream());
Scanner sc= new Scanner(proc.getInputStream());

(if you want to wrap the stream inside a scanner)

nomemory

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Light Poster

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