Command from java program

package src;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader; 

public class Command
{ 
    public static void main(String args[]) 
    { 
        try 
        {
            Process p=Runtime.getRuntime().exec("cmd /c dir"); 
            p.waitFor(); 
            BufferedReader reader=new BufferedReader(new InputStreamReader(p.getInputStream())); 
            String line=reader.readLine(); 
            while(line!=null) 
            { 
                System.out.println(line); 
                line=reader.readLine(); 
            } 

        } 
        catch(IOException e1) {} 
        catch(InterruptedException e2) {} 

        System.out.println("Done"); 
    } 
} 

I tried to run this code but it is not able to execute anything. Are there some classpath or other settings i need to do to make this work?