Program: How to run ProcessBuilder with list of commands?

Below example shows how to run ProcessBuilder with a command list. The list contains the actual command and its arguments.

package com.java2novice.processbuilder;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

public class MyMultipleCommandsEx {

	public static void main(String a[]){
		
		InputStream is = null;
		ByteArrayOutputStream baos = null;
		List<String> commands = new ArrayList<String>();
		commands.add("ls");
		commands.add("-l");
		commands.add("/Users/java2novice/");
		ProcessBuilder pb = new ProcessBuilder(commands);
		try {
			Process prs = pb.start();
			is = prs.getInputStream();
			byte[] b = new byte[1024];
			int size = 0;
			baos = new ByteArrayOutputStream();
			while((size = is.read(b)) != -1){
				baos.write(b, 0, size);
			}
			System.out.println(new String(baos.toByteArray()));
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally{
			try {
				if(is != null) is.close();
				if(baos != null) baos.close();
			} catch (Exception ex){}
		}
	}
}

total 170592
-rw-r--r--@  1 root  846622648       254 Feb  2  2012 197-89131.license
drwxr-xr-x   7 root  846622648       238 Feb 21  2012 Android UI Patterns
drwxr-xr-x   6 root  846622648       204 May 31 19:05 Android-dev
drwxr-xr-x   6 root  846622648       204 Jul 13  2011 Automation Test
drwx------+ 30 root  846622648      1020 Aug 24 19:04 Desktop
drwx------+ 13 root  846622648       442 Jun 11 21:22 Documents
drwx------+ 78 root  846622648      2652 Aug 26 14:37 Downloads
drwx------@  9 root  846622648       306 Aug 23 10:03 Dropbox
rwxr-xr-x@ 20 root  846622648       680 Aug 23 10:03 Google Drive
drwxrwxr-x   4 root       admin           136 Feb  6  2012 JProbe
drwx------@ 44 root  846622648      1496 Jul 15 19:45 Library