java写一个登录系统_Java小练习之利用面向对象写一个简单的登录系统

import java.util.Scanner;

/**

* 采用面向对象的方式 写一个登录系统

* @author Administrator

*

*/

//用户信息

class UserInfo{

public static String[] user = new String[10];

public static String[] passwd = new String[10];

public UserInfo() {

this.user[0] = "test";

this.passwd[0] ="123456";

}

}

//找回密码

class ZhaoHui extends UserInfo{

public static void zhaohui() {

Scanner s = new Scanner(System.in);

System.out.println("请输入你要找回的用户名：");

String zname = s.nextLine();

for(int i=0;i<2;i++) {

if(user[i].equals(zname)) {

Scanner ss = new Scanner(System.in);

System.out.println("恭喜你!成功找回密码，请输入："+"'张哥最帅'"+" 查看密码");

String zgzs = ss.nextLine();

if("张哥最帅".equals(zgzs)) {

System.out.println(passwd[i]);

}else {

System.out.println("请输正确！");

}

}else if(user[i]!=zname){

System.out.println("用户名不存在！");

return;

}

break;

}

}

}

//修改密码

class XiuGai extends UserInfo{

public static void xiugai() {

Scanner s =new Scanner(System.in);

System.out.println("请输入您要修改的密码：");

String xpasswd = s.nextLine();

for(int i=0;i<2;i++) {

passwd[i] = xpasswd;

if(xpasswd.equals(passwd[i])) {

System.out.println("恭喜你，修改成功！");

break;

}else {

System.out.println("修改密码失败");

break;

}

}

}

}

//查询用户

class ChaXun extends UserInfo{

public static void select() {

for(int i=0;i<2;i++) {

System.out.println("当前用户："+user[i] +"\n"+ "当前密码："+passwd[i] );

i++;

break;

}

}

}

//注册

class ZhuCe extends UserInfo{

public static void regist() {

Scanner ss = new Scanner(System.in);

System.out.println("请输入用户名：");

String suser = ss.nextLine();

System.out.println("请输入密码：");

String spasswd = ss.nextLine();

for(int i=0;i

user[i] = suser;

passwd[i] = spasswd;

System.out.println("注册成功!");

break;

}

}

}

//登录

class Loginc extends UserInfo{

public static void login() {

int flag = 1;

Scanner scanner = new Scanner(System.in);

System.out.println("请输入用户名：");

String users = scanner.nextLine();

System.out.println("请输入密码：");

String passwds = scanner.nextLine();

for(int i=0;i

if(user[i].equals(users) && passwd[i].equals(passwds)) {

System.out.println("登陆成功！");

break;

}

System.out.println("登陆失败！");

break;

}

}

}

//主界面

class ZhuJieMian{

public static void Start() {

Loginc Loginc = new Loginc();

ZhuCe ZhuCe = new ZhuCe();

ChaXun ChaXun = new ChaXun();

XiuGai XiuGai = new XiuGai();

ZhaoHui ZhaoHui = new ZhaoHui();

Scanner s = new Scanner(System.in);

while(true) {

System.out.println("|"+ "\t"+ "\t"+ "\t"+ "\t"+ "\t"+ "\t"+ "\t"+"\t"+"|");

System.out.println("|"+"\t" + "测试用户名:test 测试密码:123456" + "\t"+ "\t"+ "\t"+ "\t"+"|");

System.out.println("|" + "\t"+ "请输入[1-5]进行操作 1.登录|2.注册|3.查询当前用户|4.修改密码|5.找回密码 " + "\t"+"|");

System.out.print("请输入:");

int temp = s.nextInt();

switch(temp) {

case 1:Loginc.login();

break;

case 2:ZhuCe.regist();;

break;

case 3:ChaXun.select();;

break;

case 4:XiuGai.xiugai();;

break;

case 5:ZhaoHui.zhaohui();;

break;

default:System.out.println("错误！请重写输入正确的数字进行操作！");

}

}

}

}

public class LoginTest {

public static void main(String[] args) {

ZhuJieMian zjm = new ZhuJieMian();

zjm.Start();

}

}

运行结果：