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Grouping by standardized categories

Now that you have standardized the categories of your electronics inventory, you would like to compute the quantity of each category. Merge the quantities into category sums.

Bu egzersiz, kursun bir parçasıdır

Cleaning Data in Java

Kursa Göz Atın

Egzersiz talimatları

  • Define an enum map to store the quantity of each ProductCategory in stockByCategory.
  • Merge the quantities into category sums in stockByCategory.

Uygulamalı etkileşimli egzersiz

Bu egzersizi bu örnek kodu tamamlayarak deneyin.

public class ElectronicsCategoryExample {
    public enum ProductCategory {
        ELECTRONICS,
        HOME_APPLIANCES,
        UNCATEGORIZED;
    }

    public static void main(String[] args) {
    	Map categoryMap = new HashMap<>();
        categoryMap.put("Home Appliances", ProductCategory.HOME_APPLIANCES);
        categoryMap.put("home appliances", ProductCategory.HOME_APPLIANCES);
        categoryMap.put("HomeAppliances", ProductCategory.HOME_APPLIANCES);
        categoryMap.put("Electronics", ProductCategory.ELECTRONICS);
        categoryMap.put("electronics", ProductCategory.ELECTRONICS);
        categoryMap.put("Electronic", ProductCategory.ELECTRONICS);
        
        Map rawData = Map.of(
                "Home Appliances", 50,
                "home appliances", 25,
                "HomeAppliances", 15,
                "Electronics", 30,
                "electronics", 20,
                "Electronic", 10);

        // Define an enum map to store the quantity of each ProductCategory
        Map stockByCategory = new ____<>(____.class);

        // Merge the quantities into category sums
        rawData.forEach((raw, quantity) -> ____.____(categoryMap.get(raw), quantity, Integer::sum));

		System.out.println("Stock by category:");
        System.out.println(stockByCategory);
    }
}
Kodu Düzenle ve Çalıştır