如何在Java中使用instanceof？

Question

因此，我有一个带有rooms的arrayList，并让用户将其放置在他们要查找的房间中，im将其捕获为字符串，然后尝试使用instanceOf将其与java类的名称进行匹配，但无法这样做是由于将字符串与Java类进行比较。

我还在switch语句中捕获了答案，以确保这些类的拼写完美无误。只是不确定如何到达arrayList并拉出他们要查找的类。

public static void serachRooms(ArrayList<Room> rooms) {
        int option = 0;
        String temp = "";
        boolean flag = false;
        do {
            System.out.println("please Enter What room Type you would like:"
                    + "\nNormal Room = 1"
                    + "\nComputer Room = 2"
                    + "\nBiology Lab = 3"
                    + "\nBoard Room = 4"
                    + "\nYou must choose one!");
            option = input.nextInt();
            if (option == 1 || option == 2 || option == 3 || option == 4) {
                flag = true;
            }
        } while (!flag);
        switch (option) {
            case 1:
                temp = "BiologyLab";
                break;
            case 2:
                temp = "BoardRoom";
                break;
            case 3:
                temp = "ComputerRoom";
                break;
            case 4:
                temp = "Room";
                break;
        }
        for (Room room : rooms) {
            if (temp instanceof BiologyLab) {

            }
        }
    }

Answer 1

instanceof是非常特殊的，与类型和继承有关。签出Java documentation。

对于您的情况，您想将字符串temp与字符串"BiologyLab"进行比较。只需使用

if ("BiologyLab".equals(temp)) { 
    ...
}

并查看How To Compare Strings In Java以获得更多信息。