import java.util.Scanner;enum State {ON, OFF}public class User {private Scanner scanner = new Scanner(System.in);private String userName; //用戶名private State state = State.OFF; //登錄狀態(tài)private String password; //密碼private String readUserName() {System.out.println("請輸入用戶名");String readName = scanner.next();return readName;}private void setUserName(String var) {this.userName = var;}private String getUserName() {return this.userName;}private String readPassword() {System.out.println("請輸入密碼");String password = scanner.next();return password;}private void setPassword(String password) {this.password = password;}private String getPassword() {return this.password;}private void setState() {if (judgeUserName() && judgePassword()) {this.state = State.ON;}}private State getState() {return this.state;}private boolean judgeUserName() {if(this.userName.equals(readUserName())){System.out.println("ok");return true;} else {System.out.println("用戶名不存在");return false;} }private boolean judgePassword() {if(password.equals(readPassword())) {System.out.println("ok");return true;} else {System.out.println("密碼錯誤");return false;} }private void register() {setUserName(readUserName());setPassword(readPassword());if (getUserName() != null && getPassword() != null) {System.out.println("注冊成功");}}private void landing() {if (getState().equals(State.ON)) {System.out.println("您已登陸");} else {setState();if (getState() == State.ON) {System.out.println("登錄成功"); } else {System.out.println("登錄失敗");}}}private void quit() {if (getState().equals(State.OFF)) {System.out.println("您未登錄");} else {System.out.println("感謝使用");this.state = State.OFF; }}private void judge(int var) {switch (var) {case 1:register();break;case 2:landing();break;case 3:quit();break;case 4:System.exit(0);default:System.out.println("輸入不合法"); }}public void run() {while(true) {System.out.println("請輸入以下數(shù)字完成操作\n1.注冊 2.登陸 3.退出登錄 4.結束程序"); String get = scanner.next();try {int choice = Integer.parseInt(get);judge(choice);} catch (Exception e) {System.out.println(e);}}}} public class UserTest {public static void main(String[] args) { new User().run();} }

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