Question

I have a class that basically has two methods the first one takes a String (name of a file) and a thread:

public static void readFile(String s, Thread t){
    Runnable read = new Runnable() {
      public void run() {
          //SOME CODE



}
        t = new Thread(read);
    t.start();

}

The second method is a main method that asks the user for input and then uses that input to set a few things (like if the number of threads is just one or if it is equal to the number of objects in a list).

public static void main(String[] args){
  //SOME CODE

  for(Object x: ListOfObjects){
  //t1 is the same thread each time if one thread requested, otherwise t1 is a different thread each time
  readFromFile(textFileString, t1);
  //SOME CODE
}

If the user were to request 5 threads (for 5 items in a list), how could the above be modified for that? Currently, my main method has a loop (for the number of items in the list) and then the first method is called for each iteration in the loop. Is there a way to take the number of threads requested by the user, and initiate/start them in the first method all at once instead of one at a time and calling the method?

Answer 1

Implement the Runnable interface. I tried
this and it seems to work:

class StringThread implements Runnable
{
    private String str;
    private int num;

    StringThread(String s, int n)
    {
        str  = new String (s);
        num =n; 
    }

    public void run ( )
    {
        for (int i=1; i<=num; i++)
            System.out.print ("THREAD NAMED: " + str+"  I IS: " +
                                               i + "\n"); 
    }
}

//IN the main program:

StringThread t1 = new StringThread ("THR-1",100);
new Thread(t1). start ( );    
StringThread t2 = new StringThread ("THR-2",200);
new Thread(t2). start ( );