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一、设计梗概
做一个简单的银行、账户演示程序。
（1）定义一个账户类，包含用户名、密码、余额等属性、存钱、取钱等方法。
（2）定义一个银行类，包含银行名、账户列表等属性，开账户、查账户的功能。账户列表可以使用集合相关的类，如ArrayList，最好同时使用泛型。
（3）定义一个测试类及main函数，在其中创建一个银行，开设一些账号，模拟存钱、取钱、显示余额等。
二、内容完善
代码中第二部分的泛型尚未完成，后期会继续完善
三、代码内容
package practise;
import java.util.*;
import java.util.Scanner;
public class bank {
public static void main(String[]arg){
System.out.println("欢迎来到小猪银行！");
boolean out = true;boolean out0=true; //out和out0用于退出循环，回到初始界面
Welcome welcome = new Welcome(); //新建一个欢迎类
Count count = new Count(); //新建一个Count类(用户账户)
WorkerCount workerCount=new WorkerCount(); //新建一个WorkerCount类（工作人员账户）
workerCount.countContent.add(new java.lang.String("账号：佩奇，密码：1314")) ;
System.out.println("请选择你的账户类型：输入数字0：进入普通账户|输入数字1：进入工作人员账户");
Scanner scan = new Scanner(System.in); //用于扫描键盘输入，以做出下一步操作，下同
int judgment = scan.nextInt();
boolean rightInput=false;//rightInput判断用户输入是否正确，如果错误则提示重新输入
while (true) {
if (judgment == 0) { //judgment==0时，进入客户服务端
rightInput=true; //将rightInput设置成ture
welcome.welcomeCustomer(); //触发顾客账号登录程序
Scanner Input = new Scanner(System.in);
System.out.print("\n请输入如下数字进入客户服务：");
while (out) {
System.out.println("输入数字0：查询账户余额" +
" | 输入数字1：提取现金" +
" | 输入数字2：存入现金" +
" | 输入数字3：退卡");
int input = Input.nextInt();
switch (input) {
case 0:
System.out.print("账户余额为：" + count.banlance + "\n\n请继续下一步操作：\n");
break;
case 1:
count.WithdrawMoney();
break;
case 2:
count.deposit();
break;
case 3:
out = false;
}
}
System.out.println("感谢您的使用，欢迎下次光临！");
}
if (judgment == 1) {
rightInput=true;
welcome.welcomeWorker(); //触发工作人员登录程序
Scanner Input = new Scanner(System.in);
System.out.print("\n请输入如下数字进行不同操作：");
while (out0) {
System.out.println("输入数字0：查询银行名" +
" | 输入数字1：查询账户列表" +
" | 输入数字2：开账户" +
" | 输入数字3：关账户"+
" | 输入数字4：退出系统");
int input0 = Input.nextInt();
switch (input0) {
case 0:
workerCount.bankname();
break;
case 1:
workerCount.countlist();
break;
case 2:
workerCount.opencount();
break;
case 3:
workerCount.closecount();
break;
case 4:
out0=false;
}
}
}
if (rightInput==true)System.out.println("请重新开始您的操作");
else System.out.println("输入错误，请重新输入");
}
}
}
class Welcome{ //输入客户的账号密码，并测试信息是否正确
public void welcomeCustomer(){
while(true) {
boolean sign = false; //该标志用于退出循环，账号密码正确则break
Scanner scanner_login = new Scanner(System.in);
System.out.println("请输入您的账号名：");
String CountName = scanner_login.next();
Scanner scanner_Password = new Scanner(System.in);
System.out.println("请输入您的数字密码：");
int CountPassword = scanner_login.nextInt();
Count count_test = new Count(CountName, CountPassword, sign); //Count类reture sign，if true则退出循环，继续执行main函数
if (count_test.CountTest()) break;
}
}
public void welcomeWorker(){ //执行方法与顾客类似
while(true) {
boolean sign = false;
Scanner Workerscanner_login = new Scanner(System.in);
System.out.println("请输入您的账号名：");
String WorkerName = Workerscanner_login.next();
Scanner Workerscanner_Password = new Scanner(System.in);
System.out.println("请输入您的数字密码：");
int WorkerPassword = Workerscanner_login.nextInt();
WorkerCount Workercount_test = new WorkerCount(WorkerName, WorkerPassword, sign);
if (Workercount_test.WorkerCountTest()) break;
}
}
}
class Count{
String name;int password;boolean sign;
int banlance=10000;
Count(){};
Count(String name,int password,boolean sign){ //构造方法，sign标记用于跳出循环
this.name=name;
this.password=password;
this.sign=sign;
}
public boolean CountTest(){
if (name.equals("佩奇")){
if (password==1314){
System.out.println("账号名及密码输入正确");
sign=true;
}else System.out.println("密码输入错误，请重新输入");
}else System.out.println("账号名输入错误，请重新输入");
return sign; //此处reture sign
}
public void deposit(){ //用于存入现金
Scanner scanner=new Scanner(System.in);
System.out.println("How mach do you want to deposit?");
int deposit_money=scanner.nextInt();
this.banlance=this.banlance+deposit_money;
System.out.println("已存入:"+deposit_money+"元,剩余金额为："+this.banlance +"元"+"\n\n请继续下一步操作:");
}
public void WithdrawMoney(){ //用于提取现金
Scanner scanner=new Scanner(System.in);
System.out.println("How mach do you want to withdraw?");
int withdraw_money=scanner.nextInt();
if (this.banlance>=withdraw_money){
this.banlance=this.banlance-withdraw_money;
System.out.println("已取出："+withdraw_money+"元，剩余金额为："+this.banlance +"元"+"\n\n请继续下一步操作:");
}
}
}
class WorkerCount{ //工作人员账户
List countContent= new ArrayList();
String name;int password;boolean sign;String bankName="小猪银行";
WorkerCount(){};
WorkerCount(String name,int password,boolean sign){ //构造方法，同时判断用户名是否输入正确
this.name=name;
this.password=password;
this.sign=sign;
}
public boolean WorkerCountTest(){
if (name.equals(bankName)){
if (password==520520){
System.out.println("账号名及密码输入正确");
sign=true;
}else System.out.println("密码输入错误，请重新输入");
}else System.out.println("账号名输入错误，请重新输入");
return sign;
}
public void bankname(){
System.out.println("银行名为："+this.bankName);
while (true) {
Scanner scanner1 = new Scanner(System.in);
System.out.println("修改银行名请按：1，退出请按0");
int inputNumber = scanner1.nextInt();
if (inputNumber==0)break;
else {
Scanner scanner2 = new Scanner(System.in);
System.out.println("请输入您要修改的银行名：");
String bankName = scanner2.next();
this.bankName=bankName;
System.out.println("新的银行名为："+this.bankName+"，请继续下一步操作:"); //此处功能任有缺陷，新修改的银行名在重启系统时无法仍旧会变成“小猪银行”，暂时没想到办法完善
}
}
}
public void countlist(){
for (int i = 0 ; i < WorkerCount.this.countContent.size() ; i++ )
{
System.out.println(WorkerCount.this.countContent.get(i));
}
}
public void opencount(){
String[]opendArray=new String[2];
while (true) {
Scanner scanner0 = new Scanner(System.in);
System.out.println("请输入设置的账号名");
opendArray[0] = scanner0.next();
Scanner scanner1 = new Scanner(System.in);
System.out.println("请输入设置的密码");
opendArray[1] = scanner1.next();
countContent.add(new String("账号："+opendArray[0]+"，密码："+opendArray[1]));
System.out.println("您的账号为:"+opendArray[0]+"密码为："+opendArray[1]+"确认请按1，重新设置请按0");
Scanner scanner2 = new Scanner(System.in);
int judge = scanner2.nextInt();
if (judge==1)break;
}
}
public void closecount(){
while (true) {
Scanner scanner0 = new Scanner(System.in);
System.out.println("您要关闭的账号名为：");
String closename = scanner0.next();
Scanner scanner1 = new Scanner(System.in);
System.out.println("请输入密码：");
int password = scanner0.nextInt();
int i=countContent.indexOf(new String("账号："+closename+"，"+"密码："+password));
Scanner scanner2 = new Scanner(System.in);
System.out.println("您关闭的账号序号为:"+closename+"；确认请按1，重新设置请按0");
int judge = scanner2.nextInt();
if (judge==1){this.countContent.remove(i); break;}
}
}
}
注：鉴于作者水平有限，如有更好的算法欢迎评价。