设计物流系统

设计物流系统(面向对象的设计)。讲述不同的类以及它们之间的关系。这不是系统设计问题，所以这个问题的范围只是定义不同的类(带有它的属性和方法)
提问: Adobe
解决方案：假设我们要设计一个具有以下基本功能的物流系统：
• 系统可以接受订单将其运送到指定目的地。
• 订单将是一个项目列表，并且每个订单都需要处理成本。
• 用户必须自己注册才能使用本系统。
• 用户可以跟踪他/她的订单。
• 订单将通过自行车或卡车运送，但单一车辆只能运送一个订单。
面试中会问这些类型的问题，以判断候选人的面向对象设计技能。所以，首先我们应该考虑类。
主要课程将是：
1. 用户
2. 项目
3. 车辆
4. 地点
5. 付款明细
6. 订购
7. 物流系统
User 类适用于用户/客户/客户，他们将被收取交付物品的费用。

Java

public class User {
 
    private int userId;
    private String name;
    private Location address;
    private String mobNo;
    private String emailId;
 
    public int getUserId()
    {
        return userId;
    }
 
    public void setUserId(int userId)
    {
        this.userId = userId;
    }
 
    public String getName()
    {
        return name;
    }
 
    public void setName(String name)
    {
        this.name = name;
    }
 
    public Location getAddress()
    {
        return address;
    }
 
    public void setAddress(Location address)
    {
        this.address = address;
    }
 
    public String getMobNo()
    {
        return mobNo;
    }
 
    public void setMobNo(String mobNo)
    {
        this.mobNo = mobNo;
    }
 
    public String getEmailId()
    {
        return emailId;
    }
 
    public void setEmailId(String emailId)
    {
        this.emailId = emailId;
    }
}

Item 类表示将要运送的项目。一个订单将包含一个项目列表。

Java

public class Item {
 
    private String name;
    private int price;
    private int volume;
    private int weight;
 
    public String getName()
    {
        return name;
    }
 
    public void setName(String name)
    {
        this.name = name;
    }
 
    public int getPrice()
    {
        return price;
    }
 
    public void setPrice(int price)
    {
        this.price = price;
    }
 
    public int getVolume()
    {
        return volume;
    }
 
    public void setVolume(int volume)
    {
        this.volume = volume;
    }
 
    public int getWeight()
    {
        return weight;
    }
 
    public void setWeight(int weight)
    {
        this.weight = weight;
    }
}

位置类仅表示地址。

Java

public class Location {
 
    private Double longitude;
    private Double latitude;
 
    public Double getLongitude()
    {
        return longitude;
    }
 
    public void setLongitude(Double longitude)
    {
        this.longitude = longitude;
    }
 
    public Double getLatitude()
    {
        return latitude;
    }
 
    public void setLatitude(Double latitude)
    {
        this.latitude = latitude;
    }
}

Vehicle 类表示将用于运送/交付订单的车辆。
它将有两种类型：1. 自行车和 2. 卡车

Java

public class Vehicle {
 
    private int id;
    private String vehicleNo;
    private int capacity;
    private Location currentPosition;
    private VehicleStatus currentStatus;
 
    public Vehicle(int id, String vehicleNo, int capacity)
    {
        this.id = id;
        this.vehicleNo = vehicleNo;
        this.capacity = capacity;
    }
 
    public int getId()
    {
        return id;
    }
 
    public void setId(int id)
    {
        this.id = id;
    }
 
    public String getVehicleNo()
    {
        return vehicleNo;
    }
 
    public void setVehicleNo(String vehicleNo)
    {
        this.vehicleNo = vehicleNo;
    }
 
    public int getCapacity()
    {
        return capacity;
    }
 
    public void setCapacity(int capacity)
    {
        this.capacity = capacity;
    }
 
    public Location getCurrentPosition()
    {
        return currentPosition;
    }
 
    public void setCurrentPosition(Location currentPosition)
    {
        this.currentPosition = currentPosition;
    }
 
    public VehicleStatus getCurrentStatus()
    {
        return currentStatus;
    }
 
    public void setCurrentStatus(VehicleStatus currentStatus)
    {
        this.currentStatus = currentStatus;
    }
}

自行车只有 10 个单位的容量。

Java

public class Bike extends Vehicle {
 
    private final static int capacityofBike = 10;
 
    public Bike(int id, String vehicleNo)
    {
 
        super(id, vehicleNo, capacityofBike);
    }
}

卡车只有 100 个单位的容量(比自行车多 10 倍)。

Java

public class Truck extends Vehicle {
 
    private final static int capacityofTruck = 100;
 
    public Truck(int id, String vehicleNo)
    {
        super(id, vehicleNo, capacityofTruck);
    }
}

车辆当前状态的枚举：

Java

public enum VehicleStatus {
    FREE,
    BUSY,
    NOT_WORKING;
}

OrderPriority 的枚举：

Java

public enum OrderPriority {
    LOW,
    MEDIUM,
    HIGH;
}

OrderStatus 的枚举：

Java

public enum OrderStatus {
    DELIVERED,
    PROCESSING,
    CANCELLED;
}

PaymentMode 的枚举：

Java

public enum PaymentMode {
 
    NET_BANKING,
    CREDIT_CARD,
    DEBIT_CARD;
}

PaymentStatus 的枚举：

Java

public enum PaymentStatus {
    PAID,
    UNPAID;
}

PaymentDetails 类包含与付款相关的信息，以便在任何情况下取消订单，都可以轻松退款。

Java

public class PaymentDetails {
    private PaymentMode paymentMode;
    private String transactionId;
    private int amount;
    private PaymentStatus paymentStatus;
    private String cardNumber;
 
    public PaymentMode getPaymentMode()
    {
        return paymentMode;
    }
 
    public void setPaymentMode(PaymentMode paymentMode)
    {
        this.paymentMode = paymentMode;
    }
 
    public String getTransactionId()
    {
        return transactionId;
    }
 
    public void setTransactionId(String transactionId)
    {
        this.transactionId = transactionId;
    }
 
    public int getAmount()
    {
        return amount;
    }
 
    public void setAmount(int amount)
    {
        this.amount = amount;
    }
 
    public PaymentStatus getPaymentStatus()
    {
        return paymentStatus;
    }
 
    public void setPaymentStatus(PaymentStatus paymentStatus)
    {
        this.paymentStatus = paymentStatus;
    }
 
    public String getCardNumber()
    {
        return cardNumber;
    }
 
    public void setCardNumber(String cardNumber)
    {
        this.cardNumber = cardNumber;
    }
}

Order 类包含一个订单的所有信息。所有字段都是不言自明的。

Java

import java.util.Date;
import java.util.List;
 
public class Order {
 
    private int orderId;
    private OrderPriority priority_of_order;
    private User sender;
    private Location destination;
    private PaymentDetails paymentDetails;
    private List items;
    private Long totalWeight;
    private OrderStatus currentStatus;
    private Date timeOfOrderPlaced;
    private Date timeOfOrderDelivery;
    private Vehicle vehicleOfThisOrder;
 
    public int getOrderId()
    {
        return orderId;
    }
 
    public void setOrderId(int orderId)
    {
        this.orderId = orderId;
    }
 
    public OrderPriority getPriority_of_order()
    {
        return priority_of_order;
    }
 
    public void setPriority_of_order(OrderPriority priority_of_order)
    {
        this.priority_of_order = priority_of_order;
    }
 
    public User getSender()
    {
        return sender;
    }
 
    public void setSender(User sender)
    {
        this.sender = sender;
    }
 
    public Location getDestination()
    {
        return destination;
    }
 
    public void setDestination(Location destination)
    {
        this.destination = destination;
    }
 
    public PaymentDetails getPaymentDetails()
    {
        return paymentDetails;
    }
 
    public void setPaymentDetails(PaymentDetails paymentDetails)
    {
        this.paymentDetails = paymentDetails;
    }
 
    public List getItems()
    {
        return items;
    }
 
    public void setItems(List items)
    {
        this.items = items;
    }
 
    public Long getTotalWeight()
    {
        return totalWeight;
    }
 
    public void setTotalWeight(Long totalWeight)
    {
        this.totalWeight = totalWeight;
    }
 
    public OrderStatus getCurrentStatus()
    {
        return currentStatus;
    }
 
    public void setCurrentStatus(OrderStatus currentStatus)
    {
        this.currentStatus = currentStatus;
    }
 
    public Date getTimeOfOrderPlaced()
    {
        return timeOfOrderPlaced;
    }
 
    public void setTimeOfOrderPlaced(Date timeOfOrderPlaced)
    {
        this.timeOfOrderPlaced = timeOfOrderPlaced;
    }
 
    public Date getTimeOfOrderDelivery()
    {
        return timeOfOrderDelivery;
    }
 
    public void setTimeOfOrderDelivery(Date timeOfOrderDelivery)
    {
        this.timeOfOrderDelivery = timeOfOrderDelivery;
    }
 
    public Vehicle getVehicleOfThisOrder()
    {
        return vehicleOfThisOrder;
    }
 
    public void setVehicleOfThisOrder(Vehicle vehicleOfThisOrder)
    {
        this.vehicleOfThisOrder = vehicleOfThisOrder;
    }
}

主类(LogisticsSystem)，存储用户、订单和车辆的所有信息。它有像 takeAnOrder()、processOrder() 等方法。

Java

import java.util.ArrayList;
import java.util.List;
 
public class LogisticsSystem {
 
    private List orders;
    private List vehicles;
    private List users;
 
    public LogisticsSystem()
    {
        this.orders = new ArrayList();
        this.vehicles = new ArrayList();
        this.users = new ArrayList();
    }
 
    public void takeAnOrder(Order order)
    {
        System.out.println("Adding an order to the system");
        orders.add(order);
    }
 
    public void processOrder(Order order)
    {
        System.out.println("Processing an order of the system");
    }
 
    public Location trackOrder(int orderId)
    {
        System.out.println("Tracking an order of the system");
        Location location = null;
        // location = findLocationOfGivenOrder();
        return location;
    }
 
    public void cacelOrder(Order order)
    {
        System.out.println("Going to cancell an order of the system");
    }
 
    public void registerNewUser(User user)
    {
        System.out.println("Registering a new user to the system");
        users.add(user);
    }
 
    public List getOrders()
    {
        return orders;
    }
 
    public void setOrders(List orders)
    {
        this.orders = orders;
    }
 
    public List getVehicles()
    {
        return vehicles;
    }
 
    public void setVehicles(List vehicles)
    {
        this.vehicles = vehicles;
    }
 
    public List getUsers()
    {
        return users;
    }
 
    public void setUsers(List users)
    {
        this.users = users;
    }
}

这是测试应用程序的测试类。

Java

package com.shashi.oodesign;
 
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
 
public class Apptest {
 
    public static void main(String[] args)
    {
 
        User user = new User();
        user.setUserId(1);
        user.setName("Shashi");
        user.setEmailId("[e-mail]");
 
        Item item1 = new Item();
        item1.setName("item1");
        item1.setPrice(20);
 
        Item item2 = new Item();
        item2.setName("item2");
        item2.setPrice(40);
 
        List items = new ArrayList();
        items.add(item1);
        items.add(item2);
 
        PaymentDetails paymentDetails = new PaymentDetails();
        paymentDetails.setAmount(100);
        paymentDetails.setPaymentMode(PaymentMode.CREDIT_CARD);
        paymentDetails.setCardNumber("12345678");
 
        Location destination = new Location();
        destination.setLatitude(73.23);
        destination.setLongitude(132.34);
 
        Order order = new Order();
        order.setOrderId(1);
        order.setItems(items);
        order.setCurrentStatus(OrderStatus.PROCESSING);
        order.setDestination(destination);
        order.setPaymentDetails(paymentDetails);
        order.setTimeOfOrderDelivery(new Date());
 
        LogisticsSystem logisticsSystem = new LogisticsSystem();
        logisticsSystem.registerNewUser(user);
        logisticsSystem.takeAnOrder(order);
        logisticsSystem.processOrder(order);
    }
}