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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.

Questo esercizio fa parte del corso

Cleaning Data in Java

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Istruzioni dell'esercizio

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

Esercizio pratico interattivo

Prova a risolvere questo esercizio completando il codice di esempio.

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);
    }
}
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