Question about threading.

[FightingIrishman]

From what I can gather, the following code is supposed to execute each thread in a random order and different each time. For me the output is as if I'm not threading at all. First prints 5 times, second prints 5 times, third prints 5 times. I can't see anything wrong with the code.

// second program to demonstrate creation of thread by extenting thread class
 
class First extends Thread{      // FirstThread extended from java.lang.Thread
 
   public void run(){            // run method of class
 
      for(int i =1 ; i <=5; i++){   // when run, cycle 5 times
 
         System.out.println("First Thread is running.");
      }
   }
}
 
class Second extends Thread{        // second thread
 
   public void run(){               // run method of class
 
      for(int j = 1; j <=5; j++){      // run 5 times
 
         System.out.println("Second Thread is running.");
      }
   }
}
 
class Third extends Thread{         // third thread
 
   public void run(){               // run method of class
 
      for(int k = 1; k<=5; k++){    // run 5 times
 
         System.out.println("Third Thread is running.");
      }
   }
}
 
public class ThreadCreateExtend2{
 
   public static void main(String args[]){
 
      First f1 = new First();          // create object of First named "f1"
      f1.start();                      // call start() method inherited from thread class
      Second s1 = new Second();
      s1.start();
      Third t1 = new Third();
      t1.start();
   }
}

[Norm]

Modern computers are very fast. When the code calls the first start() the thread is started and executes the loop before the code can call the second start.
To cause the printed output to be interleaved, add a call to sleep to slow down the loop and allow the next start to be executed before the current loop ends.

Also to see what is happening, print out the value of System.currentTimeMillis() with each print statement.