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Discussion :: Threads

  1. What will be the output of the program?

       class MyThread extends Thread
   {  
      public static void main(String args)      
      {      
          MyThread t = new MyThread();           
          Thread x = new Thread(t);         
          x.start(); /* Line 7 */  
        }   
        public void run()   
        {        
            for(int i = 0; i 3; ++i)          
            {             
               System.out.print(i + "..");             
            }   
         }
      }

    2. A.

    Compilation fails.
    B.

    1..2..3..
    C.

    0..1..2..3..
    D.

    0..1..2..

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    Answer : Option D

    Explanation :

    The thread MyThread will start and loop three times (from 0 to 2).

    Option A is incorrect because the Thread class implements the Runnable interface; therefore, in line 7, Thread can take an object of type Thread as an argument in the constructor.

    Option B and C are incorrect because the variable i in the for loop starts with a value of 0 and ends with a value of 2.

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