Câu hỏi phỏng vấn Android
Câu hỏi

When to use Android's ArrayMap instead of a HashMap ?

Câu trả lời

Here are the key points to consider when deciding whether to use ArrayMap or HashMap in Android:

When to use ArrayMap

  • ArrayMap is optimized for small to medium sized collections** (up to a few hundred entries). It uses less memory than HashMap for small collections.
  • ArrayMap is more efficient for collections that are frequently iterated over, as it avoids the overhead of autoboxing primitive types.
  • ArrayMap is a good choice when you need a Map implementation that is optimized for Android's memory constraints and usage patterns.

When to use HashMap

  • HashMap is a better choice for large collections (thousands of entries or more). Its performance is better than ArrayMap for large data sets.
  • HashMap is more widely used and has better compatibility across Java environments. It's a good choice if you need to share code with non-Android Java projects.
  • HashMap provides a familia...
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