java银行系统界面代码,银行系统开发语言

用java语言编写一个小型的银行系统代码

private int balance = 0;

private  String username = "A";

private  String password = "B";

public void bank() {

    Scanner scan = new Scanner(System.in);

    String  temp;

    while (true) {

        System.out.println("输入账号：");

        if (scan.hasNext()) {

            temp = scan.next();

            if (temp.equals(username)) {

                break;

            } else {

                System.out.println("输入错误");

            }

        }

    }

    while (true) {

        System.out.println("输入密码：");

        if (scan.hasNext()) {

            temp = scan.next();

            if (temp.equals(password)) {

                break;

            } else {

                System.out.println("输入错误");

            }

        }

    }

    System.out.println("登录成功");

    while (true) {

        System.out.println("输入操作：");

        if (scan.hasNext()) {

            temp = scan.next();

            switch (temp) {

                case "存款":

                    int x = 0;

                    while (true) {

                        System.out.println("输入存款金额：");

                        if (scan.hasNextInt()) {

                            x = scan.nextInt();

                            break;

                        } else {

                            System.out.println("输入错误");

                            scan.next();

                        }

                    }

                    balance += x;

                    break;

                case "取款":

                    int y = 0;

                    while (true) {

                        System.out.println("输入取款金额：");

                        if (scan.hasNextInt()) {

                            y = scan.nextInt();

                            if (balance  y) {

                                System.out.println("余额不足");

                                continue;

                            }

                            break;

                        } else {

                            System.out.println("输入错误");

                            scan.next();

                        }

                    }

                    balance -= y;

                    break;

                case "余额":

                    System.out.println("余额：" + balance);

                    break;

                case "终止":

                    System.exit(0);

                default:

                    System.out.println("未知操作");

            }

        }

    }

相关问答

Q1: JAVA 简单银行系统的代码

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class AccountDemo {

public static double MONEY = 0;// 初始化金额是100元。

public static void main(String[] args) {

final String USER_NAME = "zhangsan";// 用户名

final String PASSWORD = "123456";// 密码

while (true) {

System.out.print("请输入用户名：");

String user_name = getString();

System.out.print("请输入密码：");

String password = getString();

if (user_name != null user_name.equals(USER_NAME)

password != null password.equals(PASSWORD)) {

System.out.println("登陆成功！你要干什么？");

while (true) {

System.out.println("1：存款");

System.out.println("2：取款");

System.out.println("3：查询余额");

System.out.println("q：退出程序");

System.out.print("请选择：");

String userIn = getString();

int in = 0;

if (userIn != null userIn.equals("1")) {

in = Integer.parseInt(userIn);

} else if (userIn != null userIn.equals("2")) {

in = Integer.parseInt(userIn);

} else if (userIn != null userIn.equals("3")) {

in = Integer.parseInt(userIn);

} else if (userIn != null

userIn.trim().toUpperCase().equals("Q")) {

in = 4;

} else {

System.out.println("你输入的指令不正确！请重新输入。");

continue;

}

switch (in) {

case 1:

double add_money = 0;

while (true) {

System.out.print("请输入你要存入的金额：");

try {

add_money = Double.parseDouble(getString());

} catch (Exception e) {

System.out.println("金额输入不正确！");

continue;

}

break;

}

MONEY += add_money;

System.out.println("存入的金额是" + add_money

+ "\r\n请选择你要的操作：");

break;

case 2:

double money = 0;

while (true) {

System.out.print("请输入你要取出的金额：");

try {

money = Double.parseDouble(getString());

} catch (Exception e) {

System.out.println("金额输入不正确！");

continue;

}

if (money MONEY) {

System.out.println("取出的金额大于现有存款，请重新输入要取出的金额！");

continue;

}

break;

}

MONEY -= money;

System.out.println("取出的金额是" + money + "\r\n请选择你要的操作：");

break;

case 3:

System.out.println("你的余额是：" + MONEY + "\r\n请选择你要的操作：");

break;

case 4:

System.out.println("程序退出！");

return;

}

}

} else {

System.out.println("错误：用户名与密码不匹配！\r\n");

System.out.println("按任意键:重新输入用户名和密码。");

System.out.println("q:退出程序。");

System.out.print("请选择:");

String in = getString();

if (in.trim().toUpperCase().equals("Q")) {

break;

}

}

}

}

public static String getString() {

String str = null;

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

try {

str = br.readLine();

} catch (IOException e) {

e.printStackTrace();

}

return str;

}

}

Q2: 用java编的银行账户系统代码

package pack.money.persistent;import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.util.ArrayList;import pack.money.entity.Client;

import pack.money.entity.ClientMessage;

public class ClientPersistent {

//private static int a=0;

private static String t,b;//t是password b是clinetname

private static ClientPersistent sp;

public static ClientPersistent getClientPersistent() {

if (sp == null) {

sp = new ClientPersistent();

}

return sp;

}

private ClientMessage getClientMessage(ResultSet rs) throws Exception{

ClientMessage student=new ClientMessage();

student.setMoney(rs.getFloat("money"));

student.setType(rs.getString("type"));

student.setClientName(rs.getString("ClientName"));

student.setTransactionID(rs.getInt("TransactionID"));

return student;

}

public Client login(Connection con,String ClientName,String password) throws Exception{

String sql="select balance,password,ClientName from Client where ClientName=? and password=?";

PreparedStatement ps=con.prepareStatement(sql);

ps.setString(1, ClientName);

ps.setString(2, password);

ResultSet rs=ps.executeQuery();

t=password;

b=ClientName;

System.out.println(t);

System.out.println(b);

if(rs.next()){

Client client=new Client();

client.setClientName(rs.getString("ClientName"));

client.setPassword(rs.getString("password"));

return client; }

throw new Exception("Can not login, the accountID or password has error. ");

} public void save(Connection con ,String money)throws Exception

{ // a++;

String s="save";

float g=Float.parseFloat(money);

String sql="update Client set balance=balance+? where ClientName=?";

String sql1="insert into ATMTransaction(ClientName,Type,money) values(?,?,?) ";

PreparedStatement ps=con.prepareStatement(sql);

PreparedStatement ps1=con.prepareStatement(sql1);

ps.setFloat(1, g);

ps.setString(2,b);

//ps1.setInt(1,a);

ps1.setString(1,b);

ps1.setString(2,s);

ps1.setFloat(3,g);

ps.executeUpdate();

ps1.executeUpdate();

}

public void withDraw (Connection con ,String money)throws Exception

{ //a++;

String s="WithDraw";

float x=Float.parseFloat(money);

String sql="update Client set balance=balance-? where ClientName=?";

String sql1="insert into ATMTransaction(ClientName,Type,money) values(?,?,?)";

PreparedStatement ps=con.prepareStatement(sql);

PreparedStatement ps1=con.prepareStatement(sql1);

ps.setFloat(1, x);

ps.setString(2,b);

//ps1.setInt(1,a);

ps1.setString(1,b);

ps1.setString(2,s);

ps1.setFloat(3,x);

ps.executeUpdate();

ps1.executeUpdate();

}

public String changePassword(Connection con, String OldPassWord,String newPassWord1,String newPassWord2)

throws Exception

{

if(t.equals(OldPassWord))

{

if(newPassWord1.equals(newPassWord2))

{

String sql="update Client set password=? where ClientName=?";

PreparedStatement ps=con.prepareStatement(sql);

ps.setString(1, newPassWord1);

ps.setString(2,b);

ps.executeUpdate();

String j="dsfasdf";

return j;

}

else

{System.out.print("确认密码错误！");br return null;}

}

else

{ return null;

}

}

public ArrayListClientMessage disPlayAll(Connection con ) throws Exception

{

String sql="select * from ATMTransaction where ClientName=? ";

PreparedStatement ps=con.prepareStatement(sql);

ps.setString(1,b);

System.out.println(b+"****b****");

ResultSet rs=ps.executeQuery();

ArrayListClientMessage message=new ArrayListClientMessage();

while(rs.next()){

message.add(this.getClientMessage(rs));

}

return message;

}

public float showBalance(Connection con ) throws Exception

{

String sql="select balance from Client where ClientName=?";

PreparedStatement ps=con.prepareStatement(sql);

ps.setString(1, b);

ResultSet rs=ps.executeQuery();

if(rs.next())

{

float s;

s=rs.getFloat("balance");

return s;

}

else return 0 ;

}

}