import java.util.Scanner;

interface INIT_MENU
{
 int INPUT=1,SEARCH=2,DELETE=3,EXIT=4;
}
interface INPUT_SELECT
{
 int NOMAL=1,UNIV=2,COMPANY=3;
}
class PhoneInfo {
 String name;
 String phoneNumber;
 
 public PhoneInfo(String name,String num)
 {
  this.name=name;
  phoneNumber=num;
 }
 public void showPhoneInfo()
 {
  System.out.println("name:"+name);
  System.out.println("phone:"+phoneNumber);
 }
}
class PhoneUnivInfo extends PhoneInfo
{
 String major;
 int year;
 
 public PhoneUnivInfo(String name,String num,String major,int year)
 {
  super(name,num);
  this.major=major;
  this.year=year;
 }
 public void showPhoneInfo()
 {
  super.showPhoneInfo();
  System.out.println("major:"+major);
  System.out.println("year:"+year);
 }
}
class PhoneCompanyInfo extends PhoneInfo
{
 String company;
 
 public PhoneCompanyInfo(String name,String num,String company)
 {
  super(name,num);
  this.company=company;
 }
 public void showPhoneInfo()
 {
  super.showPhoneInfo();
  System.out.println("company:"+company);
 }
}
class PhoneBookManager
{
 final int MAX_CNT=100;
 PhoneInfo[] infoStorage=new PhoneInfo[MAX_CNT];
 int curCnt=0;
 
 static PhoneBookManager inst=null;
 public static PhoneBookManager createManagerInst()
 {
  if(inst==null)
   inst=new PhoneBookManager();
  
  return inst;
 }
 private PhoneBookManager(){}
 
 private PhoneInfo readFriendInfo()
 {
  System.out.print("이름:");
  String name=MenuViewer.keyboard.nextLine();
  System.out.print("전화번호:");
  String phone=MenuViewer.keyboard.nextLine();
  return new PhoneInfo(name,phone);
 }
 private PhoneInfo readUnivFriendInfo()
 {
  System.out.print("이름:");
  String name=MenuViewer.keyboard.nextLine();
  System.out.print("전화번호:");
  String phone=MenuViewer.keyboard.nextLine();
  System.out.println("전공:");
  String major=MenuViewer.keyboard.nextLine();
  System.out.print("학년:");
  int year=MenuViewer.keyboard.nextInt();
  MenuViewer.keyboard.nextLine();
  return new PhoneUnivInfo(name,phone,major,year);
  
 }
 private PhoneInfo readCompanyFriendInfo()
 {
  System.out.print("이름:");
  String name=MenuViewer.keyboard.nextLine();
  System.out.print("전화번호:");
  String phone=MenuViewer.keyboard.nextLine();
  System.out.println("회사:");
  String company=MenuViewer.keyboard.nextLine();
  return new PhoneCompanyInfo(name,phone,company);
  
 }
 public void inputData()
 {
  System.out.println("데이터 입력을 시작합니다..");
  System.out.println("1.일반,2.대학,3.회사");
  System.out.print("선택>>");
  int choice=MenuViewer.keyboard.nextInt();
  MenuViewer.keyboard.nextLine();
  PhoneInfo info=null;
  
  switch(choice)
  {
  case INPUT_SELECT.NORMAL :
   info=readFriendInfo();
   break;
  case INPUT_SELECT.UNIV :
   info=readUnivFriendInfo();
   break;
  case INPUT_SELECT.COMPANY :
   info=readCompanyFriendInfo();
   break;
  }
  infoStorage[curCnt++]=info;
  System.out.println("데이터 입력이 완료되었습니다.\n");
 }
 public void searchData()
 {
  System.out.println("데이터 검색을 시작합니다.");
  System.out.print("이름:");
  String name=MenuViewer.keyboard.nextLine();
  
  int dataIdx=search(name);
  if(dataIdx<0)
  {
   System.out.println("데이터 없음\n");
  }
  else
  {
   infoStorage[dataIdx].showPhoneInfo();
   System.out.println("완료");
  }
 }
  public void deleteData()
  {
   System.out.println("데이터 삭제시작");
   System.out.print("이름:");
   String name=MenuViewer.keyboard.nextLine();
   
   int dataIdx=search(name);
   if(dataIdx<0)
   {
    System.out.println("존재안함");
   }
   else
   {
    for(int idx=dataIdx;idx<(curCnt-1);idx++)
     infoStorage[idx]=infoStorage[idx+1];
    
    curCnt--;
    System.out.println("삭제\n");
   }
  }

 
 private int search(String name)
 {
  for(int idx=0;idx<curCnt;idx++)
  {
   PhoneInfo curInfo=infoStorage[idx];
   if(name.compareTo(curInfo.name)==0)
    return idx;
  }
  return -1;
 }
}
class MenuViewer
{
 public static Scanner keyboard=new Scanner(System.in);
 
 public static void showMenu()
 {
  System.out.println("선택하세요...");
  System.out.println("1.데이터 입력");
  System.out.println("2.데이터 검색");
  System.out.println("3.데이터 삭제");
  System.out.println("4.프로그램 종료");
  System.out.print("선택:");
 }
}
class PhoneBookVer05
{
 public static void main(String[] args)
 {
  PhoneBookManager manager=PhoneBookManager.createManagerInst();
  int choice;
  
  while(true)
  {
   MenuViewer.showMenu();
   choice=MenuViewer.keyboard.nextInt();
   MenuViewer.keyboard.nextLine();
   
   switch(choice)
   {
   case INIT_MENU.INPUT :<<<<<<<<<<요부분 오류
    manager.inputData();
    break;
   case INIT_MENU.SEARCH :
    manager.searchData();
    break;
   case INIT_MENU.DELETE :
    manager.deleteData();
    break;
   case INIT_MENU.EXIT :
    System.out.println("종료");
    return;
   }
  }
 }
}

오류라 표시해논곳이 오류입니다 왜오류인지알려주세요. 책보고 그대로 썻는걸요..

Exception in thread "main" java.lang.Error: Unresolved compilation problem:
 INPUT_SELECT.NORMAL cannot be resolved

 at PhoneBookManager.inputData(PhoneInfo.java:119)
 at PhoneBookVer05.main(PhoneInfo.java:212)
부탁드려요 ㅠㅠ 책보고도 안되니;;