java模拟ATM功能（控制台连接Mysql数据库）

本文实例为大家分享了java模拟atm功能的具体代码，供大家参考，具体内容如下

有三个类：test.java、customer.java、customerdao.java、atmsystem.java

atmsystem.java实现模拟atm的功能

customer.java创建一个用户对象

customerdao.java实现连接数据库

test为主程序 

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("注册卡号：");
 int myid=input.nextint();
 system.out.println("注册用户名：");
 string myname=input.next();
 system.out.println("注册密码：");
 string mypwd=input.next();
 system.out.println("输入存入金额：");
 int mymoney=input.nextint();
 dao.regist(myid, mypwd, myname, mymoney);
 }
 public boolean login()
 {
 system.out.println("请输入密码：");
 string mypwd=input.next();
 id=dao.login(mypwd);
 if(id==-1)
 {
  system.out.println("登录失败！");
  return false;
 }
 else
 {
  system.out.println("登陆成功！");
  return true;
 }
 }
 public void query(int id)
 {
 customer cust=dao.query(id);
 system.out.println("********************");
 system.out.println("卡号："+cust.getid());
 system.out.println("余额："+cust.getmoney());
 system.out.println("用户名："+cust.getname());
 system.out.println("********************");
 }
 public void save()
 {
 system.out.println("输入存款金额：");
 int money=input.nextint();
 dao.update_save(id, money);
 }
 public void get()
 {
 system.out.println("********************");
 system.out.println("输入取款金额：");
 int money=input.nextint();
 dao.update_get(id, money);
 system.out.println("********************");
 }
 public void change()
 {
 system.out.println("请输入转账卡号：");
 int inid=input.nextint();
 system.out.println("请输入转账金额：");
 int money=input.nextint();
 dao.change(id, inid, money);
 }
 public void begin()
 {
 int num=-1;
 int num=0;
 system.out.println("请选择功能：");
 system.out.println("1.注册      2.登录");
 num=input.nextint();
 switch(num)
 {
 case 1:
  regist();
  break;
 case 2:
  if(login())
  {
  while(num!=0)
  {
   system.out.println("********************");
   system.out.println("欢迎欢迎，热烈欢迎");
   system.out.println("请选择功能：");
   system.out.println("1.存款     2.取款   3.查询   4.转账  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("谢谢使用！");
   break;
   }
  }
  }
  else
  {
  system.out.println("登录失败，账号、密码错误！");
  }
 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("余额不足！");
  }
  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("余额不足！");
   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("卡号错误！");
  }
 }
 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("此卡已注册，请勿重复注册！！！！");
  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("注册成功！");
 }
 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();
 }
 }
 
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。