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Building a category mapping

You are managing inventory for your electronics store, and you need to standardize the electronics categories in your inventory. Create a category mapping to help keep track of the products in your store.

The necessary packages such as EnumMap, and HashMap have been imported for you.

Deze oefening maakt deel uit van de cursus

Cleaning Data in Java

Cursus bekijken

Oefeninstructies

  • Create an enum called ProductCategory.
  • Look up an unknown category called "Mystery category".
  • Create an unmodifiable map using categoryMap.

Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

public class ElectronicsCategoryExample {
	// Create an enum called ProductCategory
    public ____ ____ {
        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);
        
        System.out.println("Electronics category:");
        System.out.println(categoryMap.get("Electronics"));
        
        // Look up an unknown category
        ProductCategory unknownCategory = ____.____(
    			"Mystery category", ProductCategory.UNCATEGORIZED);
                
        System.out.println("\nMystery category:");
        System.out.println(unknownCategory);
        
        // Create an unmodifiable map
        Map immutableMap = ____.____(categoryMap);
        
        System.out.println("\nAttempting to modify immutable map:");
        try {
            immutableMap.put("new", ProductCategory.ELECTRONICS);
        } catch (UnsupportedOperationException e) {
            System.out.println("Cannot modify immutable map");
        }
    }
}
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