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Interview Q&A / Java

INTERVIEW Q&A · 72 QUESTIONS

Java interview questions

Collections, the JVM, strings, exceptions and threads, the backbone of most campus placement rounds.

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  1. What is the difference between HashMap, LinkedHashMap and TreeMap?

    HashMap has no guaranteed order and gives O(1) operations. LinkedHashMap keeps insertion order, also in O(1). TreeMap keeps keys sorted and costs O(log n). Pick by the order you need.

    BeginnerQuick answer1 min read