用java写一个酒店客房管理系统。需要实现客房类型、价目、客房信息管理；实现客户信息管理；实现入住退房、收费管理

好的，下面是一个简单的酒店客房管理系统的Java代码示例：

客房类型：

public class RoomType {
    private String typeName;
    private double price;

    public RoomType(String typeName, double price) {
        this.typeName = typeName;
        this.price = price;
    }

    public String getTypeName() {
        return typeName;
    }

    public void setTypeName(String typeName) {
        this.typeName = typeName;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }
}

客房信息：

public class Room {
    private int roomId;
    private RoomType roomType;
    private boolean isOccupied;

    public Room(int roomId, RoomType roomType, boolean isOccupied) {
        this.roomId = roomId;
        this.roomType = roomType;
        this.isOccupied = isOccupied;
    }

    public int getRoomId() {
        return roomId;
    }

    public void setRoomId(int roomId) {
        this.roomId = roomId;
    }

    public RoomType getRoomType() {
        return roomType;
    }

    public void setRoomType(RoomType roomType) {
        this.roomType = roomType;
    }

    public boolean isOccupied() {
        return isOccupied;
    }

    public void setOccupied(boolean occupied) {
        isOccupied = occupied;
    }
}

客户信息：

public class Customer {
    private String name;
    private String id;
    private String phone;

    public Customer(String name, String id, String phone) {
        this.name = name;
        this.id = id;
        this.phone = phone;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }
}

入住退房：

public class CheckInCheckOut {
    public void checkIn(Room room, Customer customer) {
        if (room.isOccupied()) {
            System.out.println("该房间已经被占用");
            return;
        }
        room.setOccupied(true);
        System.out.println("客户 " + customer.getName() + " 入住房间 " + room.getRoomId());
    }

    public void checkOut(Room room) {
        if (!room.isOccupied()) {
            System.out.println("该房间未被占用");
            return;
        }
        room.setOccupied(false);
        System.out.println("房间 " + room.getRoomId() + " 已退房");
    }
}

收费管理：

public class Charge {
    public double calculateCharge(Room room, int days) {
        return room.getRoomType().getPrice() * days;
    }
}

客房管理：

import java.util.ArrayList;
import java.util.List;

public class RoomManager {
    private List<Room> rooms;

    public RoomManager() {
        rooms = new ArrayList<>();
    }

    public void addRoom(Room room) {
        rooms.add(room);
    }

    public Room getRoomById(int roomId) {
        for (Room room : rooms) {
            if (room.getRoomId() == roomId) {
                return room;
            }
        }
        return null;
    }

    public List<Room> getAllRooms() {
        return rooms;
    }

    public List<Room> getAvailableRooms() {
        List<Room> availableRooms = new ArrayList<>();
        for (Room room : rooms) {
            if (!room.isOccupied()) {
                availableRooms.add(room);
            }
        }
        return availableRooms;
    }
}

客户管理：

import java.util.ArrayList;
import java.util.List;

public class CustomerManager {
    private List<Customer> customers;

    public CustomerManager() {
        customers = new ArrayList<>();
    }

    public void addCustomer(Customer customer) {
        customers.add(customer);
    }

    public Customer getCustomerById(String customerId) {
        for (Customer customer : customers) {
            if (customer.getId().equals(customerId)) {
                return customer;
            }
        }
        return null;
    }
}

这只是一个简单的示例，实际应用中还需要根据具体需求进行完善。