本文實例為大家分享了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創建一個用戶對象

CustomerDAO.java實現連接數據庫

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('注冊卡號：'); int myid=input.nextInt(); System.out.println('注冊用戶名：'); String myname=input.next(); System.out.println('注冊密碼：'); 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：'+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.注冊 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('登錄失敗，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('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('此卡已注冊，請勿重復注冊?。。?！'); 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('注冊成功！'); } 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，也希望大家多多支持好吧啦網。