Java - 从数组列表中打印对象[重复]

Question

我已经定义了一个对象，然后从一个文件扫描器创建了许多对象。我通过使用 while 循环不断将这些对象添加到 ArrayList 中来存储它们以供以后使用来完成此操作。

我现在正在尝试将所述对象打印为字符串，我发现的问题是它具有各种属性（int、string、double、boolean、boolean、boolean）。

下面是对象：

    class Room {
    int roomNumber;
    String roomType;
    double roomPrice;
    boolean roomBalcony;
    boolean roomLounge;
    boolean roomReserved;

    public Room(int roomNumber, String roomType, double roomPrice, boolean roomBalcony, boolean roomLounge, boolean roomReserved) {
        this.roomNumber = roomNumber;
        this.roomType = roomType;
        this.roomPrice = roomPrice;
        this.roomBalcony = roomBalcony;
        this.roomLounge = roomLounge;
        this.roomReserved = roomReserved;
    }

这是扫描仪。

            while(file.hasNextLine()){
            int roomNumber = file.nextInt();
            String roomType = file.next();
            double roomPrice = file.nextDouble();
            boolean roomBalcony = file.nextBoolean();
            boolean roomLounge = file.nextBoolean();
            boolean roomReserved = false;
            rooms.add(new Room(roomNumber, roomType, roomPrice, roomBalcony, roomLounge, roomReserved));
            file.nextLine();}
        file.close();

Answer 1

您可以在Room 类中override toString() 方法并编写格式化输出的实现，例如：

public class Room {

    int roomNumber;
    String roomType;

    @Override
    public String toString(){
        StringBuilder builder = new StringBuilder();
        builder.append("Room Number : ").append(roomNumber);
        builder.append("\n");
        builder.append("Room Type : ").append(roomType);
        builder.append("\n");
        return builder.toString();
    }
}

完成后，您可以使用Room 对象调用System.out.println，它会打印输出。