What are some efficient data structures in Java?
In Java, some efficient data structures include ArrayList, HashMap, and LinkedList. Each has its own use cases.
Can you explain when to use HashMap over TreeMap?
Use HashMap for faster access times (O(1) on average) when order doesn't matter, and TreeMap when you need sorted keys.
What about performance differences between ArrayList and LinkedList?
ArrayList is better for random access due to its array-based structure, while LinkedList excels in insertions and deletions.
Are there any built-in data structures for graphs in Java?
Java doesn't have built-in graph data structures, but you can use HashMap or ArrayList to implement them.
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