음료수 자판기 프로그램

package class01;

import java.util.ArrayList;
import java.util.Scanner;

// 자판기 프로그램

// LP, ERD, UF
// 기능 명세 / CRUD / 사용자? 관리자?
// 어떤 데이터를 사용해야하는지?
// Console 화면에 어떻게 출력되어야하는지? 사용자 편의성을 충분히 고려해야함!

// 음료 항목을 추가 [관]
//  : 배열리스트에 음료객체를 추가 >> 배열리스트가 main() 소속이라서 메서드화 X
// 음료 목록 출력
// 구매하기 => R,U
// 음료 재고를 추가 [관]
//  : 음료객체의 재고속성의 값을 변경 >> 객체의 속성 값 변경이라서 메서드화 O
// 음료 항목을 삭제 [관]
//  : 배열리스트에 음료객체를 삭제

// "거스름돈" ☆
// "장바구니" ★★★

class Drink {
   private int num; // PK : 시스템에서 부여하는 값
   private String name;
   private int price;
   private int cnt;
   public Drink(int num,String name,int price){
      this.num=num;
      this.name=name;
      this.price=price;
      this.cnt=5;
   }

   public void sell() {
      this.cnt--;
      System.out.println(this.name+" 판매완료!");
   }
   public void addCnt(int cnt) {
      this.cnt+=cnt;
      // this.cnt=this.cnt+cnt;
      System.out.println(this.name+" 재고추가완료!");
   }

   public int getNum() {
      return num;
   }
   public void setNum(int num) {
      this.num = num;
   }
   public String getName() {
      return name;
   }
   public void setName(String name) {
      this.name = name;
   }
   public int getPrice() {
      return price;
   }
   public void setPrice(int price) {
      this.price = price;
   }
   public int getCnt() {
      return cnt;
   }
   public void setCnt(int cnt) {
      this.cnt = cnt;
   }
   @Override
   public String toString() {
      String msg="[" + num + "] " + name + " " + price + "원";
      if(this.cnt<=0) {
         msg+=" [재고없음]";
      }
      else {
         msg+=" [재고 "+this.cnt+"]";
      }
      return msg;
   }
}

public class Test01 {

   public static int check(ArrayList<Drink> datas,int num) {
      // 존재하는 번호인지 ???
      boolean flag=false;
      int i=-1;
      for(i=0;i<datas.size();i++) {
         if(datas.get(i).getNum()==num) {
            flag=true;
            System.out.println("[로그] 음료삭제가능");
            break;
         }
      }
      if(!flag) {
         System.out.println("없는번호입니다...");
      }      
      return i;
   }

   public static void main(String[] args) {

      // "자판기"
      //  : "프로그램"의 데이터 !
      ArrayList<Drink> datas=new ArrayList<Drink>();

      int PK=1001;
      datas.add(new Drink(PK++,"콜라",1200));
      datas.add(new Drink(PK++,"사이다",1100));

      Scanner sc=new Scanner(System.in);

      while(true) {
         System.out.println("=== 자 판 기 ===");
         System.out.println("1. 목록출력");
         System.out.println("2. 구매");
         System.out.println("0. 종료");
         Systehttp://m.out.print("입력 >> ");
         int action=sc.nextInt();
         if(action==0) {
            break;
         }
         else if(action==777) {
            while(true) {
               System.out.println("=== 관 리 자 모 드 ===");
               System.out.println("1. 음료추가");
               System.out.println("2. 재고추가");
               System.out.println("3. 음료삭제");
               System.out.println("0. 종료");
               Systehttp://m.out.print("입력 >> ");
               action=sc.nextInt();
               if(action==0) {
                  break;
               }
               else if(action==1) {
                  Systehttp://m.out.print("추가할 음료 이름 입력 >> ");
                  String name=sc.next();
                  Systehttp://m.out.print("추가할 음료의 가격 입력 >> ");
                  int price=sc.nextInt();

                  datas.add(new Drink(PK++,name,price)); // 새 객체를 생성하고 pk name price를 인자로 넣어준다.
               }
               else if(action==2) {
                  System.out.println("=== 목 록 ===");
                  for(Drink data:datas) {
                     System.out.println(data);
                  }
                  Systehttp://m.out.print("입력 >> ");
                  int num=sc.nextInt();

                  // 존재하는 번호인지 ???
                  boolean flag=false;
                  int i;
                  for(i=0;i<datas.size();i++) {
                     if(datas.get(i).getNum()==num) {
                        flag=true;
                        System.out.println("[로그] 재고추가가능");
                        break;
                     }
                  }
                  if(!flag) {
                     System.out.println("없는번호입니다...");
                     continue;
                  }

                  Systehttp://m.out.print("추가할 재고수량 입력 >> ");
                  int cnt=sc.nextInt();

                  datas.get(i).addCnt(cnt);
               }
               else if(action==3) {
                  Systehttp://m.out.print("삭제할 음료의 번호 입력 >> ");
                  int num=sc.nextInt();

                  int i=check(datas,num);

                  datas.remove(i);
               }
            }
         }
         else if(action==1) {
            System.out.println("=== 목 록 ===");
            for(Drink data:datas) {
               System.out.println(data);
            }
         }
         else if(action==2) { // 구매
            System.out.println("=== 목 록 ===");
            for(Drink data:datas) {
               System.out.println(data);
            }
            Systehttp://m.out.print("입력 >> ");
            int num=sc.nextInt();

            // 1. 존재하는 번호인지
            // 2. 재고가 있는지
            boolean flag=false;
            int i;
            for(i=0;i<datas.size();i++) {
               if(datas.get(i).getNum()==num) {
                  if(datas.get(i).getCnt()>0) {
                     flag=true;
                     System.out.println("[로그] 구매가능");
                     break;
                  }
                  System.out.println("[로그] 재고없음");
                  break;
               }
            }
            if(!flag) {
               System.out.println("없는 번호이거나 재고가 없습니다...");
               continue;
            }
            datas.get(i).sell();
         }
      }


      








   }

}