JAVA写一个小型水果超市_f.setfruitid()-优快云博客

这是一个初学者用JAVA编写的简单水果超市系统，包括水果类Fruit、用户类User、购物车类Cart的定义，以及DAO接口和实现。系统实现了添加水果、查询所有水果、按编号查询水果、删除水果、添加到购物车、显示购物车等功能。

初学java，还不太熟悉，技术有限，多多包涵，哈哈。

水果超市包括以下功能：

1.添加水果
2.显示水果
3.根据编号查询水果
4.删除水果
5.添加购物车
6.查看购物车
7.根据编号修改水果

0.退出

下面是我的包及类的构造：

代码展示：

package com.gem.fruit.entity;

public class Fruit {
   private int fruitID;
   private String name;
   private double price;
   private int count;
   private String address;
   public int getFruitID() {
       return fruitID;
   }
   public void setFruitID(int fruitID) {
       this.fruitID = fruitID;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public double getPrice() {
       return price;
   }
   public void setPrice(double price) {
       this.price = price;
   }
   public int getCount() {
       return count;
   }
   public void setCount(int count) {
       this.count = count;
   }
   public String getAddress() {
       return address;
   }
   public void setAddress(String address) {
       this.address = address;
   }
   public Fruit() {
       super();
       // TODO Auto-generated constructor stub
   }
   public Fruit(int fruitID, String name, double price, int count, String address) {
       super();
       this.fruitID = fruitID;
       this.name = name;
       this.price = price;
       this.count = count;
       this.address = address;
   }
   @Override
   public String toString() {
       return "Fruit [fruitID=" + fruitID + ", name=" + name + ", price=" + price + ", count=" + count + ", address="
               + address + "]";
   }

}

package com.gem.fruit.entity;

public class User {
   private int userId;
   private String userName;
   private String userPassword;

   public int getUserId() {
       return userId;
   }

   public void setUserId(int userId) {
       this.userId = userId;
   }

   public String getUserName() {
       return userName;
   }

   public void setUserName(String userName) {
       this.userName = userName;
   }

   public String getUserPassword() {
       return userPassword;
   }

   public void setUserPassword(String userPassword) {
       this.userPassword = userPassword;
   }

   public User(int userId,String userName, String userPassword) {
       super();
       this.userId=userId;
       this.userName = userName;
       this.userPassword = userPassword;
   }

   @Override
   public int hashCode() {
       final int prime = 31;
       int result = 1;
       result = prime * result + ((userName == null) ? 0 : userName.hashCode());
       result = prime * result + ((userPassword == null) ? 0 : userPassword.hashCode());
       return result;
   }

   @Override
   public boolean equals(Object obj) {
       if (this == obj)
           return true;
       if (obj == null)
           return false;
       if (getClass() != obj.getClass())
           return false;
       User other = (User) obj;
       if (userName == null) {
           if (other.userName != null)
               return false;
       } else if (!userName.equals(other.userName))
           return false;
       if (userPassword == null) {
           if (other.userPassword != null)
               return false;
       } else if (!userPassword.equals(other.userPasswor