java模擬ATM功能（控制檯連線Mysql資料庫）
阿新 • • 發佈：2020-05-28
本文例項為大家分享了java模擬ATM功能的具體程式碼，供大家參考，具體內容如下
有三個類：Test.java、Customer.java、CustomerDAO.java、ATMSystem.java
ATMSystem.java實現模擬ATM的功能
Customer.java建立一個使用者物件
CustomerDAO.java實現連線資料庫
Test為主程式
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("註冊卡號：");
int myid=input.nextInt();
System.out.println("註冊使用者名稱：");
String myname=input.next();
System.out.println("註冊密碼：");
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("請輸入密碼：");
String mypwd=input.next();
id=dao.login(mypwd);
if(id==-1)
{
System.out.println("登入失敗！");
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："+cust.getid());
System.out.println("餘額："+cust.getmoney());
System.out.println("使用者名稱："+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("請輸入轉賬卡號：");
int inid=input.nextInt();
System.out.println("請輸入轉賬金額：");
int money=input.nextInt();
dao.change(id,inid,money);
}
public void begin()
{
int num=-1;
int Num=0;
System.out.println("請選擇功能：");
System.out.println("1.註冊 2.登入");
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("請選擇功能：");
System.out.println("1.存款 2.取款 3.查詢 4.轉賬 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("登入失敗，賬號、密碼錯誤！");
}
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("餘額不足！");
}
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("餘額不足！");
return;
}
else
{
sql="update mysql set money = money - ? where id = ?";
p=conn.prepareStatement(sql);
p.setInt(1,myid);
p.executeUpdate();
sql="update mysql set money = money + ? where id = ?";
p=conn.prepareStatement(sql);
p.setInt(1,inid);
p.executeUpdate();
}
}
}
else
{
System.out.println("卡號錯誤！");
}
}
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("此卡已註冊，請勿重複註冊！！！！");
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("註冊成功！");
}
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內容，希望對大家的學習有所幫助，也希望大家多多支援我們。