Kui sageli kasutad sa HashMap andmestruktuuri oma projektides?

The HashMap data structure (or similar hash tables) is used very frequently because it provides quick access to data by key — on average in O(1) time.

In projects, I use HashMap for:

• Caching data to quickly get results without repeated calculations.
• Storing settings or parameters, where the key is the parameter name.
• Indexing objects by a unique identifier.
• Counting the occurrences of elements (e.g., words in a text).

Example of usage in tests:

Map<String, Integer> wordCount = new HashMap<>();
for (String word : words) {
    wordCount.put(word, wordCount.getOrDefault(word, 0) + 1);
}

Thus, HashMap is one of the basic and frequently used tools in development and testing.