Question

我知道这个问题经常出现，但即使在查看问题后我也找不到解决方案..

因此，对于学校，我们必须创建一个自己的Zuul世界版本。我已经实现了一个投影仪。首先我把它放在Game类中，但我认为将它放在它自己的类Beamer中会更好。 Beamer类看起来如下：

public class Beamer
{
    private Room beamerRoom;
    private Room beamer;
    private int timesFired;
    private boolean beamerCharged;

    public Beamer(int timesFired, boolean beamerCharged)
    {
        this.timesFired = 0;
        this.beamerCharged = false;
    }

    public int getTimesFired()
    {
        return timesFired;
    }

    public Room getBeamerRoom()
    {
        return beamerRoom;
    }

    public boolean getBeamerCharged()
    {
        return beamerCharged;
    }

    public Room setBeamerRoom(Room room)
    {
        this.beamerRoom = Game.getCurrentRoom();
        return beamerRoom;
    }

    /**
     * Try to use beamer device. When you charge the beamer, it memorizes the current     room.
     * When you fire the beamer, it transports you immediately back to the room it was
     * charged in.
     */
    public void beamer(Command command){
        if (!command.hasSecondWord()) {
            // if there is no second word, we don't know what to do...
            System.out.println("Charge or fire beamer?");
            return;
        }
        String action = command.getSecondWord();

        if (action.equals("charge")) {
            if(timesFired() < 1)
            {
                beamerRoom = Game.getCurrentRoom();
                System.out.println("This room is charged to beam!");
                beamerCharged = true;
            }
            else
            {
                System.out.println("The beamer has already been fired and can't be charged again");
            }
        } else if (action.equals("fire")) {
            if(beamerCharged == true)
            {    
                if(timesFired < 1)
                {
                    Game.getCurrentRoom() = beamer.getBeamerRoom();
                    System.out.println("The beamer has succesfully been fired!");
                    System.out.println(currentRoom.getLongDescription());
                    timesFired++;
                    beamerCharged = false;
                }
                else
                {
                    System.out.println("You can only fire the beamer once!");
                }
            }
            else
            {
                System.out.println("The beamer hasn't been charged yet!");
            }
        } else {
            System.out.println("Invalid beamer command!");
            return;
        }
    }
}

我在这里收到错误method getCurrentRoom() cannot be referenced from a static context： beamerRoom = Game.getCurrentRoom();

Game中获取当前房间的方法如下：

public Room getCurrentRoom()
    {
        return currentRoom;
    }

很简单，在我看来应该有用。

我该如何解决这个问题？我环顾四周但找不到有效的修复方法..

如果您需要更多Game类代码，请询问。我没有在这里发布，因为它是300多行。

编辑：我已经找到了我做错了什么。通过使用Game.getCurrentRoom，它查看了Game类，而不是Game的对象。至少那是我认为出了问题。我有更多方法的错误消息，使用大写字母（Game.<method>），Player.<method>），但是当我没有使用大写字母（game.<method>），player.<method>时它运作良好。

所以我猜问题已经解决了。

Answer 1

当您致电Game.getCurrentRoom()时，您正试图在课程Game上调用此方法。但是您将该方法定义为实例方法。因此，您需要更改代码以使用Game的单例实例访问其实例方法，或者您需要将Class上的mehtods声明为static。请注意，这些方法只能访问类成员，而不能访问实例成员。

public static Room getCurrentRoom()
{
    return currentRoom; // currentRoom has to be declared as a private static class member
}

Zuul世界：非静态方法getCurrentRoom（）不能从静态上下文中引用

1 个答案: