Question

当我编译我的bankSim类时，我得到错误：非静态方法setWhichQ（int）不能从静态上下文引用。我该怎么做才能在bankSim类中引用我的Event类方法？就在这之下是processArrival，它是发生错误的地方。之后是我的整个活动课程。

public void processArrival(Arrival arrEvent, Arrival[] inputData, int inputDataIndex,
                               SortedList<Event> eventList, QueueDSVector<Arrival> teller1, QueueDSVector<Arrival> teller2) {

        boolean atFront1 = teller1.isEmpty();  // am I the only one here?
        boolean atFront2 = teller2.isEmpty();


        if (atFront1) {    // if no other customers, then immediately get served
            Departure newDep = new Departure(arrEvent.getArrTime(), arrEvent);
            // because this customer's next Event will be a departure
            eventList.insert(newDep); // put the departure into eventList
        } // end if

        else if (atFront2) {    // if no other customers, then immediately get served
            Departure newDep = new Departure(arrEvent.getArrTime(), arrEvent);
            // because this customer's next Event will be a departure
            eventList.insert(newDep); // put the departure into eventList
        } // end if

        else if ( teller1.size()< teller2.size() ) {  //queue of teller 1 is less than teller 2
               teller1.enqueue(arrEvent);  // put new customer into bank line to wait

               Event.setWhichQ(1);
        }

        else if (teller2.size() < teller1.size()) { 
               teller2.enqueue(arrEvent); 
               Event.setWhichQ(2);
           }




public abstract class Event implements Comparable<Event> {



  protected int whichQ;


    public Event() {
        whichQ = 0;
    }

    public int compareTo (Event other) {
        int thisTime = this.getTime();
        int otherTime = other.getTime();

        return (thisTime - otherTime);
    }

   public int getWhichQ() {
      return whichQ;
    }
//    
   public void setWhichQ(int q) {
        if (q >= 2)
            whichQ = 2;
        else if (q<=1)       // < 0 = 0 
            whichQ = 1; 
        else
            whichQ = q;
    }

    public abstract int getTime(); 
    public abstract String toString(); 

} // end Event class

Answer 1

问题似乎是你正在调用Event.setWhich（），它引用了Event类型，而不是Event对象。要使用非静态方法，必须首先实例化对象：

Event test = new Event();

然后在该实例化对象上调用该方法：

test.setWhichQ(1);

同样，如果您想使用上面指出的setWhichQ（）方法，则必须将Event更改为静态类，并将whichQ设为静态字段。在这种情况下，可以使用对类本身的引用来调用Event.setWhichQ（），并且同样可以修改哪个Q.

如何在bankSim类中使用我的Event类方法？

1 个答案: