学生选课和银行系统java代码(适合初学者)

import java.util.*; class Admin { Scanner scanner = new Scanner(System.in); //普通用户登陆 void pt(ArrayList<Bank> list){ System.out.println("*********************************"); System.out.println("*\t请输入您的帐号：\t*"); System.out.println("*********************************"); int id = scanner.nextInt(); for(int i = 0;i < list.size(); i++){ if(list.get(i).id == id){ System.out.println("*********************************"); System.out.println("*\t请输入您的密码：\t*"); System.out.println("*********************************"); for(int j = 0; j < 3; j++){ int pw = scanner.nextInt(); if(list.get(i).password == pw){ System.out.println("*****************************************"); System.out.println("*\t登录成功！欢迎进入本系统！\t*"); System.out.println("*****************************************"); list.get(i).login(list); break; }else if(j != 2){ System.out.println("*****************************************"); System.out.println("*\t您的密码有误，请重新输入！\t*"); System.out.println("*****************************************"); }else { System.out.println("*********************************"); System.out.println("*\t您的输入已到三次！\t*"); System.out.println("*********************************"); } } break; }else if(i == list.size()-1){ System.out.println("*************************"); System.out.println("*\t帐号不存在！\t*"); System.out.println("*************************"); } } } //管理员用户登陆 void admin(ArrayList<Bank> list){ while(true){ System.out.println("*************************"); System.out.println("*\t1.添加用户\t*"); System.out.println("*\t2.删除用户\t*"); System.out.println("*\t3.查询用户\t*"); System.out.println("*\t4.打印清单\t*"); System.out.println("*\t5.统计金额\t*"); System.out.println("*\t6.返回主菜单\t*"); System.out.println("*************************"); int num = scanner.nextInt(); switch( num ){ case 1 : System.out.println("*********************************"); System.out.println("*\t1.添加普通用户\t\t*\n*\t2.添加VIP用户\t\t*"); System.out.println("*********************************"); int number = scanner.nextInt(); switch(number){ case 1 : newUser(list);break; case 2 : newVIP(list);break; default : System.out.println("*************************"); System.out.println("*\t您的输入有误！\t*"); System.out.println("*************************"); } break; case 2 : deleteUser(list);break; case 3 : selectUser(list);break; case 4 : allUser(list);break; case 5 :int sum = 0; for(int i=0 ;i < list.size(); i++){ sum += list.get(i).money; } System.out.println("*****************************************"); System.out.println("*\t本银行的总共金额为："+sum+"\t*"); System.out.println("*****************************************"); break; case 6 : return; default : System.out.println("*************************"); System.out.println("*\t您的输入有误！\t*"); System.out.println("*************************"); } } } //新建用户 void newUser(ArrayList<Bank> list){ System.out.println("*********************************"); System.out.println("*\t请输入新建用户的帐号：\t*"); System.out.println("*********************************"); int userID = scanner.nextInt(); for(int i=0; i < list.size(); i++){ if(userID == list.get(i).id){ System.out.println("*********************************"); System.out.println("*\t您输入的帐号已存在！\t*"); System.out.println("*********************************"); return; } } System.out.println("*********************************"); System.out.println("*\t请输入新建用户的密码：*"); System.out.println("*********************************"); int userpassword = scanner.nextInt(); System.out.println("请输入新建用户的姓名："); String username = scanner.next(); System.out.println("请输入新建用户的存款："); int usermoney = scanner.nextInt(); System.out.println("*********************************"); list.add(new Bank(userID,userpassword,usermoney,username)); } //新建VIP用户 void newVIP(ArrayList<Bank> list){ System.out.println("*********************************"); System.out.println("*\t请输入新建用户的帐号：\t*"); System.out.println("*********************************"); int userID = scanner.nextInt(); for(int i=0; i < list.size(); i++){ if(userID == list.get(i).id){ System.out.println("*********************************"); System.out.println("*\t您输入的帐号已存在！\t*"); System.out.println("*********************************"); return; } } System.out.println("*********************************"); System.out.println("*\t请输入新建用户的密码：*"); System.out.println("*********************************"); int userpassword = scanner.nextInt(); System.out.println("请输入新建用户的姓名："); String username = scanner.next(); System.out.println("请输入新建用户的存款："); int usermoney = scanner.nextInt(); System.out.println("*********************************"); list.add(new VIPBank(userID,userpassword,usermoney,username)); } //删除用户 void deleteUser(ArrayList<Bank> list){ System.out.println("请输入要删除用户的帐号："); int userID = scanner.nextInt(); for(int i=0 ; i < list.size();i++){ if(userID == list.get(i).id){ System.out.println("是否确认删除？ 1.确认 2.取消"); int num = scanner.nextInt(); switch(num){ case 1 : list.remove(i);System.out.println("删除用户成功！");break; case 2 : return; default : System.out.println("您的输入有误！"); } break; }else if(i == list.size()-1){ System.out.println("用户不存在！"); } } } //查询用户 void selectUser(ArrayList<Bank> list){ System.out.println("请输入要查询用户的帐号："); int userID = scanner.nextInt(); for(int i=0 ; i < list.size();i++){ if(userID == list.get(i).id){ allInfo(list.get(i)); break; }else if(i == list.size()-1){ System.out.println("用户不存在！"); } } } //显示所有用户 void allInfo(Bank bank){ System.out.println("*********************************"); System.out.println("*\t您的账户为："+bank.id+"\t*"); System.out.println("*\t您的密码为："+bank.password+"\t*"); System.out.println("*\t您的姓名为："+bank.name+"\t*"); System.out.println("*\t您的余额为："+bank.money+"\t\t*"); System.out.println("*********************************"); } //打印所有用户 void allUser(ArrayList<Bank> list){ for(int i=0 ; i < list.size(); i++){ list.get(i).info(); } } }