import java.util.Scanner;
public class View Code {
         public static void main(String[] args) {
                  Scanner scan = new Scanner(System.in);
                  system.out.println("请输入您的操作选项");
                  int num = scan.nextInt();
                  switch (num) {
                         case ‘1‘:
                                Scanner scan = new Scanner (System.in);
                                System.out.println("请输入用户名:");
                                int user = scan.nextInt();

                                System.out.println("请输入密码:");
                                int password = scan.nextInt();
                                         if(ture&&ture){
                                         System.out.println("登陆成功");
                                             /*继续执行下一步操作*/
                                         }else{
                                          System.out.println("登陆失败，请重新登录");
                                          } 
                           case ‘2‘:
                                       system.exit(-1);
                    default:
                            System.out.println("无效的输入，请  重新输入");          
                   }