java模擬ATM功能(控制臺(tái)連接Mysql數(shù)據(jù)庫)

更新時(shí)間：2022年05月27日 10:41:06 作者：TK13的舔狗

這篇文章主要介紹了java模擬ATM功能，控制臺(tái)連接Mysql數(shù)據(jù)庫，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

本文實(shí)例為大家分享了java模擬ATM功能的具體代碼，供大家參考，具體內(nèi)容如下

有三個(gè)類：Test.java、Customer.java、CustomerDAO.java、ATMSystem.java

ATMSystem.java實(shí)現(xiàn)模擬ATM的功能

Customer.java創(chuàng)建一個(gè)用戶對(duì)象

CustomerDAO.java實(shí)現(xiàn)連接數(shù)據(jù)庫

Test為主程序

ATMSystem.java:

package ATM;
 
import java.util.Scanner;
 
public class ATMSystem 
{
 CustomerDAO dao=new CustomerDAO();
 Scanner input=new Scanner(System.in);
 private int id;
 public ATMSystem()
 {
 
 }
 public void Regist()
 {
 System.out.println("注冊(cè)卡號(hào)：");
 int myid=input.nextInt();
 System.out.println("注冊(cè)用戶名：");
 String myname=input.next();
 System.out.println("注冊(cè)密碼：");
 String mypwd=input.next();
 System.out.println("輸入存入金額：");
 int mymoney=input.nextInt();
 dao.Regist(myid, mypwd, myname, mymoney);
 }
 public boolean login()
 {
 System.out.println("請(qǐng)輸入密碼：");
 String mypwd=input.next();
 id=dao.login(mypwd);
 if(id==-1)
 {
  System.out.println("登錄失??！");
  return false;
 }
 else
 {
  System.out.println("登陸成功！");
  return true;
 }
 }
 public void query(int id)
 {
 Customer cust=dao.query(id);
 System.out.println("********************");
 System.out.println("卡號(hào)："+cust.getid());
 System.out.println("余額："+cust.getmoney());
 System.out.println("用戶名："+cust.getname());
 System.out.println("********************");
 }
 public void save()
 {
 System.out.println("輸入存款金額：");
 int money=input.nextInt();
 dao.update_save(id, money);
 }
 public void get()
 {
 System.out.println("********************");
 System.out.println("輸入取款金額：");
 int money=input.nextInt();
 dao.update_get(id, money);
 System.out.println("********************");
 }
 public void change()
 {
 System.out.println("請(qǐng)輸入轉(zhuǎn)賬卡號(hào)：");
 int inid=input.nextInt();
 System.out.println("請(qǐng)輸入轉(zhuǎn)賬金額：");
 int money=input.nextInt();
 dao.change(id, inid, money);
 }
 public void begin()
 {
 int num=-1;
 int Num=0;
 System.out.println("請(qǐng)選擇功能：");
 System.out.println("1.注冊(cè)      2.登錄");
 Num=input.nextInt();
 switch(Num)
 {
 case 1:
  Regist();
  break;
 case 2:
  if(login())
  {
  while(num!=0)
  {
   System.out.println("********************");
   System.out.println("歡迎歡迎，熱烈歡迎");
   System.out.println("請(qǐng)選擇功能：");
   System.out.println("1.存款     2.取款   3.查詢   4.轉(zhuǎn)賬  0.退出");
   System.out.println("********************");
   num=input.nextInt();
   switch(num)
   {
   case 1:
   save();
   break;
   case 2:
   get();
   break;
   case 3:
   query(id);
   break;
   case 4:
   change();
   break;
   case 0:
   System.out.println("謝謝使用！");
   break;
   }
  }
  }
  else
  {
  System.out.println("登錄失敗，賬號(hào)、密碼錯(cuò)誤！");
  }
 break;
 default:
  break;
 }
 }
}

Customer.java

package ATM;
 
public class Customer 
{
 private int id;
 private String pwd;
 private int money;
 private String name;
 public int getid()
 {
 return id;
 }
 public void setid(int newid)
 {
 id=newid;
 }
 public String getpwd()
 {
 return pwd;
 }
 public void setpwd(String newpwd)
 {
 pwd=newpwd;
 }
 public String getname()
 {
 return name;
 }
 public void setname(String newname)
 {
 name=newname;
 }
 public int getmoney()
 {
 return money;
 }
 public void setmoney(int newmoney)
 {
 money=newmoney;
 }
}

CustomerDAO.java:

package ATM;
 
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
 
 
public class CustomerDAO
{
 private Connection conn=null;
 private java.sql.PreparedStatement p=null;
 public CustomerDAO()
 {
 try {
  Class.forName("org.gjt.mm.mysql.Driver");
 } catch (ClassNotFoundException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }
 try {
  conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/mysql", "root", "");
 } catch (SQLException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }
 }
 public int login(String mypwd)
 {
 String sql="select * from mysql where pwd = ?";
 try 
 {
  p=conn.prepareStatement(sql);
  p.setString(1, mypwd);
  ResultSet rs=p.executeQuery();
  if(rs.next())
  {
  return rs.getInt("id");
  }
  rs.close();
  p.close();
  conn.close();
 } 
 catch (SQLException e) 
 {
  e.printStackTrace();
 }
 return -1;
 }
 public Customer query(int id)
 {
 Customer cust=new Customer();
 try
 {
  String sql="select * from mysql where id = ?";
  p=conn.prepareStatement(sql);
  p.setInt(1, id);
  ResultSet rs=p.executeQuery();
  if(rs.next())
  {
  cust.setid(rs.getInt("id"));
  cust.setmoney(rs.getInt("money"));
  cust.setname(rs.getString("name"));
  cust.setpwd(rs.getString("pwd"));
  }
 }
 catch (Exception e) {
  // TODO: handle exception
 }
 return cust;
 
 }
 public void update_get(int id,int money) 
 {
 String sql="select * from mysql where id = ?";
 try 
 {
  p=conn.prepareStatement(sql);
  p.setInt(1, id);
  ResultSet rs=p.executeQuery();
  if(rs.next())
  {
  if(rs.getInt("money")<money)
  {
   System.out.println("余額不足！");
  }
  else
  {
   sql="update mysql set money = money - ? where id = ?";
   p=conn.prepareStatement(sql);
   p.setInt(1, money);
   p.setInt(2, id);
   p.executeUpdate();
   System.out.println("取款成功！");
  }
  }
 }
 catch (Exception e)
 {
  // TODO: handle exception
 }
 }
 public void update_save(int id,int money)
 {
 String sql="update mysql set money = money + ? where id = ?";
 try 
 {
  p=conn.prepareStatement(sql);
  p.setInt(1, money);
  p.setInt(2, id);
  p.executeUpdate();
  System.out.println("存款成功！");
 }
 catch (Exception e) 
 {
  // TODO: handle exception
 }
 }
 public void change(int myid,int inid,int money)
 {
 try
 { String sql="select * from mysql where id = ?";
  p=conn.prepareStatement(sql);
  p.setInt(1, inid);
  ResultSet rs=p.executeQuery();
  if(rs.next())
  {
  sql="select * from mysql where id = ?";
  p=conn.prepareStatement(sql);
  p.setInt(1, myid);
  rs=p.executeQuery();
  if(rs.next())
  {
   if(rs.getInt("money")<money)
   {
   System.out.println("余額不足！");
   return;
   }
   else
   {
   sql="update mysql set money = money - ? where id = ?";
   p=conn.prepareStatement(sql);
   p.setInt(1, money);
   p.setInt(2, myid);
   p.executeUpdate();
   sql="update mysql set money = money + ? where id = ?";
   p=conn.prepareStatement(sql);
   p.setInt(1, money);
   p.setInt(2, inid);
   p.executeUpdate();
   }
  }
  }
  else
  {
  System.out.println("卡號(hào)錯(cuò)誤！");
  }
 }
 catch (Exception e) {
  // TODO: handle exception
 }
 }
 public void Regist(int myid,String mypwd,String myname,int mymoney)
 {
 String sql;
 try
 {
  sql="select * from mysql where id = ?";
  p=conn.prepareStatement(sql);
  p.setInt(1, myid);
  ResultSet rs=p.executeQuery();
  if(rs.next())
  {
  System.out.println("此卡已注冊(cè)，請(qǐng)勿重復(fù)注冊(cè)?。。?！");
  return;
  }
 }
 catch (Exception e)
 {
  // TODO: handle exception
 }
 
 try 
 {
  sql="insert into mysql(id,pwd,money,name) values(?,?,?,?)";
  p=conn.prepareStatement(sql);
  p.setInt(1, myid);
  p.setString(2, mypwd);
  p.setInt(3, mymoney);
  p.setString(4, myname);
  p.executeUpdate();
  System.out.println("注冊(cè)成功！");
 }
 catch (Exception e) 
 {
  // TODO: handle exception
 }
 }
}

Test.java:

package ATM;
 
public class Test 
{
 public static void main(String[] args) 
 {
 // TODO Auto-generated method stub
 ATMSystem ATM=new ATMSystem();
 while(true)
 {
  ATM.begin();
 }
 }
 
}

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