非静态方法toString（）不能从静态上下文中引用

Question

不需要任何代码，只需要某种指导。希望保持我的学术诚信；）

我不断收到那个烦人的错误。我需要为每个Room实例调用toString方法。有什么建议？如果可能的话，我希望在2小时内给出答案。

public class Hotel
{
    //constant
    public static final int NUM_ROOMS = 20;

    //variables
    public Room[] theRoom;
    public String name;
    public int totalDays;
    public double totalRate;
    public int singleCount;
    public int doubleCount;
    public int roomsRented;
    public int NOT_FOUND;

    public Hotel(String newName) {
        name = newName;
        Room[] Rooms = new Room[NUM_ROOMS];
    }

    public double getTotalRentalSales() {
        return totalRate + roomsRented;
    }

    public double getAvgDays() {
        return roomsRented/totalDays;
    }

    public double getAvgRate() {
        return totalRate/roomsRented;
    }

    public int getSingleCount() {
        return singleCount;
    }

    public int getDoubleCount() {
        return doubleCount;
    }

    public String printRentalList() {
        System.out.println("Room Information: " + Room.toString());
    }
}

Answer 1

您不应尝试调用toString()Room类，而应调用Room 对象
。在该方法中，请使用for循环遍历房间数组，并打印通过调用toString()数组中保存的每个Room对象返回的String，因为这是您的方法应做的事情。

例如

System.out.println("All Foos held here include: ");

// using a "for-each" loop, assuming an array called fooArray that holds Foo objects
for (Foo foo: fooArray) {
   System.out.println(foo);
}

显然，您将不得不更改代码的类型和变量名称。

编辑2：尽管您将不得不使用标准的for循环，而不是for-each循环，因为您将不会遍历整个数组，而是在达到roomsRented计数时退出。

System.out.println("All Foos held here include: ");

// using standard for loop, assuming an array called fooArray that holds Foo objects
for (int i = 0; i < someMaxNumber; i++) {
   System.out.println(fooArray[i]);
}