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改进这个问题
我需要在另一个方法中使用来自一个方法的变量。代码如下：

public static void secondMain() {
        BufferedReader reader;
        var lines = new ArrayList<String>();
        var rooms = new ArrayList<Room>();

    try {
        reader = new BufferedReader(new FileReader("rooms.txt"));
        String line = reader.readLine();
        lines.add(line);
        while (line != null) {
            line = reader.readLine();
            lines.add(line);

        }

        reader.close();

        for (int i = 0; i < lines.size() - 1; i++){

            String[] words = lines.get(i).split(" ");
            var room = new Room();
            room.roomNum = Integer.parseInt(words[0]);
            room.roomType = (words[1]);
            room.roomPrice = Double.parseDouble(words[2]);
            room.hasBalcony = Boolean.parseBoolean(words[3]);
            room.hasLounge = Boolean.parseBoolean(words[4]);
            room.eMail = (words[5]);
            rooms.add(room);    

            }

这里是需要使用的地方：

public static void reserveRoom() {
        // TODO Auto-generated method stub

    String choice = "";

    do {
secondMain();
        System.out.println("\n-- ROOM RESERVATION --");
        System.out.println("Please enter the room number you wish to reserve");
        System.out.println("Q - Quit");
        Room selectedRoom = null;
         var searchRoomNum = input.nextInt();
        for(int i = 0; i < rooms.size(); i++){                 
              if(rooms.get(i).roomNum == searchRoomNum){
                  selectedRoom = rooms.get(i);            
                    System.out.println("Room Number: " + selectedRoom.roomNum);
                    System.out.println("Room Type: " + selectedRoom.roomType);
                    System.out.println("Room Price: " + selectedRoom.roomPrice);
                    System.out.println("Balcony: " + selectedRoom.hasBalcony);
                    System.out.println("Lounge: " + selectedRoom.hasLounge);
                    System.out.println("Email: " + selectedRoom.eMail);
                    System.out.println("-------------------");
              }
         }

    }

我当前的错误在for循环中，我正在针对数组测试条件。”无法解析文件室”。