StringPrinter.java

public class StringPrinter {

  private final ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(2, 2, 0,
      TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>());
  
   public static void main(String[] args) {
    new StringPrinter().printString();
  }

  public void printString() {
    for (int i = 1; i <= 6; i++) {
      threadPoolExecutor.execute(getRunnable(i));
    }
  }

  private Runnable getRunnable(final int i) {
    Runnable runnable = new Runnable() {
      @Override
      public void run() {
        String randomString = RandomClass.getRandomString(i);
        System.out.println("String returned is : + randomString);
      }
    };
    return runnable;
  }
}