在不连接数据库的情况下，用控制台实现某种管理系统的登录，注册
以及对
用户信息，密码的修改功能
代码如下
public class Demo1 {//模拟注册系统//定义存储用户信息的数组static String arrId[] = {} ;static String arrName[] = {};static String arrPw[] = {};static String arrEmail[] = {};static int loginIndex = -1;//用户注册public static void register(String id,String name,String pw,String email){//数组的扩容arrId = Arrays.copyOf(arrId, arrId.length+1);arrName = Arrays.copyOf(arrName, arrName.length+1);arrPw = Arrays.copyOf(arrPw, arrPw.length+1);arrEmail = Arrays.copyOf(arrEmail, arrEmail.length+1);//注册用户length-1是因为要放在数组的最后一个arrId[arrId.length-1] = id;arrName[arrName.length-1] = name;arrPw[arrPw.length-1] = pw;arrEmail[arrEmail.length-1] = email;}//测试注册是否成功public static void showInfo(){for(int i =0;i<arrId.length;i++){System.out.println(arrId[i]+" "+arrName[i]+" "+arrPw[i]+" "+arrEmail[i]);}}//验证用户名和密码 3次public static boolean check(String name,String pw){int flag = 0;//表示没用用户名或密码for(int i = 0; i < arrName.length;i++){if(arrName[i].equals(name)&&arrPw[i].equals(pw)){//flag = 1;//存储登录用户的下标loginIndex = i;return true; }}return false;/*if(flag == 1){return true;}else{return false;}*/}//修改个人信息public static void updateInfo(String name,String email){arrName[loginIndex] = name;arrEmail[loginIndex] = email;}//修改密码public static void updatePw(String newPw,String confirmPw){if(newPw.equals(confirmPw)) {arrPw[loginIndex] = newPw; System.out.println("修改密码成功!");}else System.out.println("俩次密码不一致");}public static void main(String[] args) {//欢迎页面信息System.out.println("-------欢迎进入客户管理模块-------");//接收键盘输入Scanner sc = new Scanner(System.in);while(true){System.out.println("1 注册");System.out.println("2 登录");System.out.println("0 退出系统");System.out.println("请输入编号:");int num = sc.nextInt();switch(num){case 1:System.out.println("请输入客户编号:");String id = sc.next();System.out.println("请输入客户姓名:");String name = sc.next();System.out.println("请输入客户密码:");String pw = sc.next();System.out.println("请输入客户邮箱:");String email = sc.next();register(id,name,pw,email);System.out.println("注册成功!");showInfo();break;case 2:int count = 0;do{//密码超过3次退出系统if(count==3){System.out.println("超过3次,退出系统");System.exit(0);}System.out.println();System.out.println("请输入客户姓名:");name = sc.next();System.out.println("请输入客户密码:");pw = sc.next();count++;}while(!check(name,pw));System.out.println("");System.out.println("1 修改个人信息");System.out.println("2 修改密码");System.out.println("0 返回上一级菜单");System.out.println("请输入编号:");num = sc.nextInt();switch(num){case 1:System.out.println("请输入客户姓名:");name = sc.next();System.out.println("请输入客户邮箱:");email = sc.next();updateInfo(name,email);showInfo();break;case 2:System.out.println("请输入新密码:");String newPw = sc.next();System.out.println("请确认新密码:");String confirmPw = sc.next();updatePw(newPw,confirmPw);break;case 0:break;}break;case 0://退出运行环境System.exit(0);}}}}