getRuntime check device

gistfile1.txt

/*** Main Thread ***/

import java.io.IOException;

public class MyTest {

	public static void main(String[] args) throws InterruptedException{
		
		System.out.println("Test start");
		Thread thread = new Thread(new Runnable(){

		    public void run(){
		        try {
					checkDevice();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} //check if video0 device exists
		    }
		});
		thread.start();
		thread.join();
	}

    private static void checkDevice() throws IOException{
        String[] args = new String[2];
        args[0]="ls";
        args[1]="/dev/video0";

        Runtime rt = Runtime.getRuntime();
        ProcessExecuter.executeWait(rt, args);
    }
}


/*** ProcessExecuter ***/
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class ProcessExecuter {
       
       private static class DummyReader extends Thread{
       
              private InputStream in;

              public DummyReader(InputStream in){
                     this.in = in;
              }

              public void run(){

                     InputStreamReader isr = new InputStreamReader(in);
                     BufferedReader br = new BufferedReader(isr);
                     try {
                            String line = null;
                            do{
                               line=br.readLine();
                               System.out.println(line);
                            } while( (line=br.readLine())!=null );
                     } catch (IOException e) {}
                     finally {
                            try {
                                   in.close();
                            } catch (IOException e) {}
                     }
              }
       }
       public static void executeWait(final Runtime rt, final String[] args) throws IOException {

              System.out.println("#### before rt.exec ####");
              Process process = rt.exec(args);
              System.out.println("#### after rt.exec ####");

              new DummyReader(process.getInputStream()).start();
              new DummyReader(process.getErrorStream()).start();
              try {
                     int val = process.waitFor();
                     System.out.println("exitValue : "+val);
              } catch (InterruptedException e) {}
       }
}