What is the output(joining thread)? : Questions « Thread « SCJP

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public class MainClass implements Runnable {
    public static void main(String[] args) {
      Thread t = new Thread(new MainClass());
      t.start();
      System.out.print("m1 ");
      t.join();
      System.out.print("m2 ");
   }
   public void run() {
     System.out.print("r1 ");
     System.out.print("r2 ");
   }
 }