synchronized_block.java

  
  public static  String getNextAvailableTicket() {
    String availableNumber = null;
    try {
      synchronized(TicketingSystem.class){
        for (Ticket number: numberList) {
          if(number.getStatus() == "open") {
            number.setStatus("pending"); // changing the state of the object
            
            System.out.printf("Thread name %s - number found %s \n",Thread.currentThread().getName(), number.getName());
            Thread.sleep(5000); // assume processing some business logic
            number.setStatus("open"); // decide to put it back due to some error
            
            availableNumber = number.getName();
            break;
          }
        }      
      }
    } catch (InterruptedException e) {
      e.printStackTrace();
    }