Runtime method error .

Question

Hello ! Can anyone please point out the mistake(s) I have been doing in line 24 of the following program making it impossible to compile .
Thank you.
Nadeem
// Demonstrating exec() , addShutdownHook(t) in Runtime class.
class ExecRuntime2 {
public static void main(String args[]) {
  Runtime   r = Runtime.getRuntime();
  Process p   = null ;
  String rp[] = {"notepad","winword"};
  String ev[] = {"Path=C:/WINDOWS","Path=C:/Program Files/Microsoft Office/Office11"};
  r.traceInstructions(true);             //Ignored if the VM does not support this feature.
  r.traceMethodCalls(true);              //Ignored if the VM does not support
  System.out.println("Active Count (Before) : " + Thread.activeCount());
  r.addShutdownHook(new ShutDownHook());
  System.out.println("Active Count (After ) : " + Thread.activeCount());
  System.out.println("Available Processors  : " + r.availableProcessors());
  //r.runFinalization();
  //r.halt(0);                        //!!! Extreme Caution : See JDK1.4 Help.
  try {
   for(int i = 0 ; i < 2 ; i++ )
    p = r.exec(rp,ev[i]); // ERROR HERE. DOESN'T COMPILE.
p.waitFor(); //Waiting for Notepad to finish.
}catch(Exception e) {                   //Make exceptions specific !!
System.out.println("Error executing notepad.");
System.out.println("p.exitValue(): 0 (Perfect exit :(subprocess))");
System.out.println("Notepad returned " + p.exitValue());
class ShutDownHook extends Thread {
Thread t ;
char c1 = 'a', c2 = 'b' ;
ShutDownHook() {
t = new Thread(this,"T1");
t.start();
public void run() {
try {
for(int i = 0; i < 10; i++) {
System.out.println("Shutdown hook :" + t + " " + i);
Thread.sleep(1000);
}catch(InterruptedException e) {
System.out.println("Thread exception :" + e);
}finally {
System.out.println("finally c1 : " + c1 + " & c2 : " + c2);
protected void finalize() {

Answer 1

Thre is no Runtime.exec() method that has two String arguments. Try something like
p = r.exec(rp,new String[]{ev[i]});
I don't understand why you are building the instruction in this way. I would define an object that was constructed with the two strings and had an exec() method that created the Process and executed it. It could also handle the stdout and stderr streams associated with the process.
I don't see why you have the magic number 2 in
for(int i = 0 ; i < 2 ; i++ )
since you can use the array length to limit the loop.
You don't seem to be reading stdout and stderr from the process.
If you want to use this safely then read http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html .