What are the differences between HashMap and TreeMap in Java?
HashMap is an unordered collection that allows null values, while TreeMap is sorted and does not allow null keys.
Which one is faster for lookups?
HashMap is generally faster for lookups due to its constant time complexity, while TreeMap has a logarithmic time complexity.
When should I use TreeMap instead of HashMap?
Use TreeMap when you need sorted order or range queries, as it maintains a natural ordering of keys.
Are there any memory considerations I should be aware of?
Yes, HashMap typically uses less memory than TreeMap because TreeMap maintains additional data structures for ordering.
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