Interview Q&A / Java
Java interview questions
Collections, the JVM, strings, exceptions and threads, the backbone of most campus placement rounds.
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- What is a TreeMap and how does it keep its keys sorted?
TreeMap stores entries in a red-black tree, a self-balancing binary search tree, ordered by the keys natural order or a supplied Comparator. get, put and remove take O(log n), and it offers range methods like firstKey and floorKey.
IntermediateQuick answer1 min read