为啥这个运行的结果到第二个输入就停了,不判断直接跳出来值,但是运行不报错..

Question

import java.util.Scanner;class homework2{ public static void main(String[] args){ Scanner input=new Scanner (System.in); Scanner two=new Scanner (System.in); System.out.print("请输入当前日期的第一个首字母(小写):"); String weekday=input.nextLine(); switch(weekday){ case "m": System.out.println("m"); break; case "w": System.out.println("w"); break; case "f": System.out.println("f"); break; case "t": System.out.println("t"); break; case "s": System.out.print("请输入当前日期的第二个小写字母:"); weekday=two.nextLine(); if(two.equals("e")){ System.out.println("a"); }else if(two.equals("u")){System.out.println("u");//为啥这里判断好不输出了,写不下去了脑壳疼. } break; default: break; } }}