すし注文処理を作成してみよう(Java)

public class SushiApp{
  public static void main(String[] args){
    
  }
  public static Map<String,List<Sushi>> loadFile(File file){
		Map<String,List<Sushi>> data=new LinkedHashMap<>();
		try (FileInputStream fis = new FileInputStream(file);
				InputStreamReader isr = new InputStreamReader(fis,"UTF-8");
				BufferedReader br = new BufferedReader(isr)) {
			String line;
			while((line = br.readLine())!= null){
				String[] values=line.split(",");
				String cat=values[0];
				String name=values[1];
				int price=Integer.parseInt(values[2]);
				Sushi s = new Sushi(name,price);
				if(!data.containsKey(cat)) {
					data.put(cat,new ArrayList<Sushi>());
				}
				data.get(cat).add(s);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		return data;
	}
}

public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    File file=new File("sushi.csv");
	Map<String,List<Sushi>> data = loadFile(file);
    System.out.println(data.size());
}

public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    File file=new File("sushi.csv");
	Map<String,List<Sushi>> data = loadFile(file);
    //System.out.println(data.size());
	//カテゴリーリストの作成
    List<String> catList=new ArrayList<>(data.keySet());
}

	public static void showCategory(List<String> catList) {
		System.out.println("***カテゴリ一覧***");
		for(int i=0;i<catList.size();i++) {
			System.out.printf("%d.%s%n", i,catList.get(i));
		}
	}

public static void main(String[] args) throws Exception{
    略 
    System.out.println("***ご注文をどうぞ***");
    while(true){
      ~カテゴリ選択部分~
      Category selectedCategory = categoryList.get(no);
      while(true){
        ~カテゴリ内商品一覧~
        displayOrderSheet(orderedSushiItems,false); 
        System.out.print("これでよろしいですか(b:戻る,c:カテゴリ一覧,e:注文完了)>>");
        input=sc.next();
        if(input.equalsIgnoreCase("b")){
          //カテゴリ内商品一覧へ飛ぶ
          continue;
        }
        if(input.equalsIgnoreCase("c")){
          //カテゴリ選択へ飛ぶ
          break;
        }
        if(input.equalsIgnoreCase("e")){
          //最初のwhile(true)を抜ける

        }
      }
    }
  }

public static void main(String[] args) throws Exception{
    略 
    System.out.println("***ご注文をどうぞ***");
    outer:while(true){
      ~カテゴリ選択部分~
      Category selectedCategory = categoryList.get(no);
      while(true){
        ~カテゴリ内商品一覧~
        displayOrderSheet(orderedSushiItems,false); 
        System.out.print("これでよろしいですか(b:戻る,c:カテゴリ一覧,e:注文完了)>>");
        input=sc.next();
        if(input.equalsIgnoreCase("b")){
          //カテゴリ内商品一覧へ飛ぶ
          continue;
        }
        if(input.equalsIgnoreCase("c")){
          //カテゴリ選択へ飛ぶ
          break;
        }
        if(input.equalsIgnoreCase("e")){
          //最初のwhile(true)を抜ける
          break outer;
        }
      }
    }
  }

  public static void main(String[] args) throws Exception{
    略 
    System.out.println("***ご注文をどうぞ***");
    boolean onOrder=true;
    while(onOrder){
      ~カテゴリ選択部分~
      Category selectedCategory = categoryList.get(no);
      while(true){
        ~カテゴリ内商品一覧~
        displayOrderSheet(orderedSushiItems,false); 
        System.out.print("これでよろしいですか(b:戻る,c:カテゴリ一覧,e:注文完了)>>");
        input=sc.next();
        if(input.equalsIgnoreCase("b")){
          //カテゴリ内商品一覧へ飛ぶ
          continue;
        }
        if(input.equalsIgnoreCase("c")){
          //カテゴリ選択へ飛ぶ
          break;
        }
        if(input.equalsIgnoreCase("e")){
          //最初のwhile(true)を抜ける
          onOrder=false;
          break;
        }
      }
    }
  }

public static void main(String[] args) throws Exception{
    略 
    System.out.println("***ご注文をどうぞ***");
    boolean onOrder=true;
    while(onOrder){
      ~カテゴリ選択部分~
      Category selectedCategory = categoryList.get(no);
      while(true){
        ~カテゴリ内商品一覧~
        displayOrderSheet(orderedSushiItems,false); 
        System.out.print("これでよろしいですか(b:戻る,c:カテゴリ一覧,e:注文完了)>>");
        input=sc.next();
        if(input.equalsIgnoreCase("b")){
          //カテゴリ内商品一覧へ飛ぶ
          continue;
        }
        if(input.equalsIgnoreCase("c")){
          //カテゴリ選択へ飛ぶ
          break;
        }
        if(input.equalsIgnoreCase("e")){
          //最初のwhile(true)を抜ける
          onOrder=false;
          break;
        }
      }
    }
    displayOrderSheet(orderedSushiItems,true);
  }

import java.util.*;
import java.io.*;
public class SushiApp{
  public static void main(String[] args) throws Exception{
    Scanner sc =new Scanner(System.in);
    File file  = new File("sushi.csv");
    ArrayList<Sushi> allData = loadFile(file);
    ArrayList<Category> categoryList= createCategoryList(allData);
    
    ArrayList<Sushi> orderedSushiItems = new ArrayList<>();
    System.out.println("***ご注文をどうぞ***");
    boolean onOrder=true;
    while(onOrder){
      displayCategoryList(categoryList);
      System.out.print("番号を入力(e:注文完了)>>");
      String input = sc.next();
      if(input.equalsIgnoreCase("e")){
        break;
      }
      int no = Integer.parseInt(input);
      Category selectedCategory = categoryList.get(no);
      while(true){
        selectedCategory.showLabel();
        selectedCategory.showCategoryItems();
        System.out.print("番号をカンマ区切りで入力(c:カテゴリ一覧)>>");
        input = sc.next();
        if(input.equalsIgnoreCase("c")){
          break;
        }
        String[] nums = input.split(",");
        for(String n : nums){
          int idx = Integer.parseInt(n);
          Sushi sushi = selectedCategory.getItem(idx);
          orderedSushiItems.add(sushi);
        }
        displayOrderSheet(orderedSushiItems,false); 
        System.out.print("これでよろしいですか(b:戻る,c:カテゴリ一覧,e:注文完了)>>");
        input=sc.next();
        if(input.equalsIgnoreCase("b")){
          continue;
        }
        if(input.equalsIgnoreCase("c")){
          break;
        }
        if(input.equalsIgnoreCase("e")){
          onOrder = false;
          break;
        }
      }
    }
    displayOrderSheet(orderedSushiItems,true);
  }

  static void displayOrderSheet(ArrayList<Sushi> orderedSushiItems,boolean total){
    System.out.println("-----注文表-----");
    int sum =0;//合計金額を保持する変数
    for(Sushi sushi : orderedSushiItems){
      sum += sushi.price;
      System.out.println(sushi.showInfo());
    }
    if(total){
      System.out.printf("合計 %d円%n",sum);
    }
  }
  static void displayCategoryList(ArrayList<Category> cats){
    System.out.println("***カテゴリ一覧***");
    for(int i=0;i<cats.size();i++){
      System.out.printf("%d.%s%n",i,cats.get(i).catName);
    }
  }
  static ArrayList<Sushi> loadFile(File file) throws Exception{
    ArrayList<Sushi> list =new ArrayList<>();
    FileInputStream fis=new FileInputStream(file);
    InputStreamReader isr = new InputStreamReader(fis,"UTF-8");
    BufferedReader br = new BufferedReader(isr);
    String line;
    while((line = br.readLine())!=null){
      String[] values=line.split(",");
      String category=values[0];
      String name=values[1];
      int price = Integer.parseInt(values[2]);

      Sushi s = new Sushi(category,name,price);
      list.add(s);
    }
    br.close();
    return list;
  }
  static ArrayList<Category> createCategoryList(ArrayList<Sushi> allData){
    ArrayList<String> catNames = new ArrayList<>();
    for(Sushi sushi : allData){
      if(!catNames.contains(sushi.category)){
        catNames.add(sushi.category);
      }
    }
    ArrayList<Category> categoryList =new ArrayList<>();
    for(String catName:catNames){
      Category c=new Category(catName);
      for(Sushi sushi :allData){
        if(sushi.category.equals(catName)){
          c.addItem(sushi);
        }
      }
      categoryList.add(c);
    }
    return categoryList;
  }
}
class Sushi{
  String category;
  String name;
  int price;
  Sushi(String category,String name,int price){
    this.category = category;
    this.name=name;
    this.price = price;
  }
  String showInfo(){
    return String.format("%s(%d円)",this.name,this.price);
  }
}
class Category{
  String catName;//カテゴリ名
  ArrayList<Sushi> sushiList=new ArrayList<>();//このカテゴリのSushiが入るリスト
  Category(String catName){
    this.catName=catName;
  }
  void showLabel(){
    System.out.println("***"+this.catName+"***");
  }
  void addItem(Sushi sushi){
    this.sushiList.add(sushi);
  }
  Sushi getItem(int index){
    return this.sushiList.get(index);
  }
  void showCategoryItems(){
    for(int i=0;i<this.sushiList.size();i++){
      System.out.printf("%d.%s%n",i,this.sushiList.get(i).showInfo());
    }
  }
}