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好吧啦网。