How to destroy a process that created by processBuilder?

[hou01087]

I need to write a program that create some process by select number from menu. And then, if I select 4, ALL process created by this program will be terminate.

So, I'm using processBuilder to create process.
The problem is how can I destroy the process?

Thank you.

Here's is my code,

import java.io.IOException;
import java.util.Scanner;

public class process1{
    public static void main(String[] args)
    {
		final int MAX_PROCESS = 100;
		Scanner scan = new Scanner(System.in);
		int choice;
		boolean cont = true;
		ProcessBuilder proc[] = new ProcessBuilder[MAX_PROCESS];
		int numOfProcess = 0;

		while(cont)
		{
			System.out.println("---1. Calculator---");
			System.out.println("---2. Notepad   ---");
			System.out.println("---3. Paint     ---");
			System.out.println("---4. Terminate ---");

			choice = scan.nextInt();

			switch(choice)
			{
				case 1:
					try
					{
						proc[numOfProcess] = new ProcessBuilder("calc.exe");
						proc[numOfProcess].start();
					}
					catch (IOException e)
					{
						e.printStackTrace();
					}
					break;
				case 2:
					try
					{

						proc[numOfProcess] = new ProcessBuilder("notepad.exe");
						proc[numOfProcess].start();
					}
					catch (IOException e)
					{
						e.printStackTrace();
					}
					break;
				case 3:
					try
					{

						proc[numOfProcess] = new ProcessBuilder("paint.exe");
						proc[numOfProcess].start();

					}
					catch (IOException e)
					{
						e.printStackTrace();
					}
					break;
				case 4:
					//for(int i=0; i<numOfProcess; i++)
					//	proc[i].destroy;
					cont=false;
					break;
				default:
					System.out.println("Error: Please input correct selection!");
			}

		}
  }
}

[Ezzaral]

You need to retain the Process returned by the start() method. The Process objects has a destroy() method that you can use to kill it.

You should change your "proc" array to be a Process array instead of ProcessBuilder. You don't need to keep the ProcessBuilder around for anything after you have created the process.

[hou01087]

You need to retain the Process returned by the start() method. The Process objects has a destroy() method that you can use to kill it.

You should change your "proc" array to be a Process array instead of ProcessBuilder. You don't need to keep the ProcessBuilder around for anything after you have created the process.

Process can't declare be array:-/,
because process is belong to java.lang.object.
That's why I'm using ProcessBuilder to create process...

[quuba]

Let's view result

ProcessBuilder pb = new ProcessBuilder("calc.exe");
                        System.out.println(pb.getClass());
                        //even if you write
                        Object p = pb.start();// Object or not object?
                        System.out.println(p.getClass());
                        proc[choice] = (Process)p;
                        System.out.println(proc[choice].getClass());

where proc is declared as Process array (Ezzaral point of view).

[hou01087]

I think process cant assign to an object.

[Ezzaral]

I'm not sure what part you are confused about, but "process cant assign to an object" doesn't have anything to do with what I said.

This tiny example shows what I was referring to.

try {
    Process[] proc = new Process[2];
    proc[0] = new ProcessBuilder("calc.exe").start();
    proc[1] = new ProcessBuilder("notepad.exe").start();
    
    try {
        Thread.sleep(3000);
    } catch (InterruptedException ex) {
    }
    
    proc[0].destroy();
    proc[1].destroy();
    
} catch (IOException ioe) {
    ioe.printStackTrace();
}

[hou01087]

It's work!!
Thanks for helping:)

[quuba]

Some explanation to a side issue - with some of the statements I can not agree

Process can't declare be array,
because process is belong to java.lang.object.
That's why I'm using ProcessBuilder to create process...

I think process cant assign to an object.

I recomended to read java tutorial: Inheritance, Casting Objects
http://java.sun.com/docs/books/tutorial/java/IandI/subclasses.html
They are more informative than me.