这篇文章主要讲解了java模拟ATM功能的详细解析，内容清晰明了，对此有兴趣的小伙伴可以学习一下，相信大家阅读完之后会有帮助。
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();
}
}
}看完上述内容，是不是对java模拟ATM功能的详细解析有进一步的了解，如果还想学习更多内容，欢迎关注亿速云行业资讯频道。
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