java:55:error:'；其他'；没有'；如果'；

所以基本上我只是想让这段代码正常工作。当我在两个“if”语句下面加上“else”时，它就会运行。但是，当我将其移到上方时，会出现以下错误：

Driver.java:55: error: 'else' without 'if'

我真的很感激能帮我解决这个问题，这样它就可以再次运行了

     {
        synchronized(someObject)
        {
           someObject.wait();
           System.out.println(ID + " has been notified.");

           Customer customer = null;

           if(Dispatcher.customerRequiresPickUp() && (customer = Dispatcher.queue.poll()) != null && (rideCount >= workFinished))         

             System.out.println("Customer has been picked up by driver #" + ID);

             try
              {
                Thread.sleep(rn.nextInt(5000) + 1000);
                System.out.println("Driver #" + ID + " has dropped off " + customer.getName() + " at " + customer.getEndLocation() + ".");
              }
              catch(InterruptedException e)
              {
              }

           else
              System.out.println("Driver #" + ID + " will continue to wait for a customer."); 

           if(rideCount >= workFinished)
             onDuty(false);
        }   
     }

---

如果

if

语句的主体是多行的，则需要使用大括号

{}

。像这样^

if语句需要方括号始终使用大括号{}以避免混淆和错误。if语句不使用封闭方括号。因此，本例中的错误

if(Dispatcher.customerRequiresPickUp() && (customer = Dispatcher.queue.poll()) != null && (rideCount >= workFinished))
{        

         System.out.println("Customer has been picked up by driver #" + ID);

         try
          {
            Thread.sleep(rn.nextInt(5000) + 1000);
            System.out.println("Driver #" + ID + " has dropped off " + customer.getName() + " at " + customer.getEndLocation() + ".");
          }
          catch(InterruptedException e)
          {
          }
}
else
{
  System.out.println("Driver #" + ID + " will continue to wait for a customer."); 
}