{"id":23918,"date":"2026-06-03T04:23:19","date_gmt":"2026-06-03T04:23:19","guid":{"rendered":"https:\/\/sharpinterview.online\/?sharp_quiz=java-interview-concurrenthashmap-comparison"},"modified":"2026-06-03T04:23:19","modified_gmt":"2026-06-03T04:23:19","slug":"java-interview-concurrenthashmap-comparison","status":"publish","type":"sharp_quiz","link":"https:\/\/sharpinterview.online\/?sharp_quiz=java-interview-concurrenthashmap-comparison","title":{"rendered":"Java: In Java, which comparison about ConcurrentHashMap and Concurrent Collections is accurate?"},"content":{"rendered":"

Question<\/h2>\n

In Java, which comparison about ConcurrentHashMap and Concurrent Collections is accurate?<\/p>\n

    \n
  1. There is no practical difference in behavior, performance, or API design when ConcurrentHashMap and Concurrent Collections is involved.<\/li>\n
  2. It usually scales better than wrapping a plain HashMap with one synchronized lock around every access.<\/li>\n
  3. The oldest option related to ConcurrentHashMap and Concurrent Collections is always the right production choice regardless of context.<\/li>\n
  4. Differences around ConcurrentHashMap and Concurrent Collections are mostly cosmetic, so correctness and maintainability do not change.<\/li>\n<\/ol>\n

    Hint<\/h2>\n

    Focus on the behavior or tradeoff, not just the keyword.<\/p>\n

    Answer and rationale<\/h2>\n

    Correct answer:<\/strong> B. It usually scales better than wrapping a plain HashMap with one synchronized lock around every access.<\/p>\n

    It usually scales better than wrapping a plain HashMap with one synchronized lock around every access. This is the comparison that usually separates memorization from understanding.<\/p>\n

    Track:<\/strong> Java<\/p>\n","protected":false},"excerpt":{"rendered":"

    In Java, which comparison about ConcurrentHashMap and Concurrent Collections is accurate?<\/p>\n","protected":false},"author":1,"featured_media":0,"template":"","topic":[44,3,4],"difficulty":[6],"class_list":["post-23918","sharp_quiz","type-sharp_quiz","status-publish","hentry","topic-concurrency-concurrenthashmap-and-concurrent-collections","topic-java","topic-java-interview-questions","difficulty-easy"],"_links":{"self":[{"href":"https:\/\/sharpinterview.online\/index.php?rest_route=\/wp\/v2\/sharp_quiz\/23918","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sharpinterview.online\/index.php?rest_route=\/wp\/v2\/sharp_quiz"}],"about":[{"href":"https:\/\/sharpinterview.online\/index.php?rest_route=\/wp\/v2\/types\/sharp_quiz"}],"author":[{"embeddable":true,"href":"https:\/\/sharpinterview.online\/index.php?rest_route=\/wp\/v2\/users\/1"}],"wp:attachment":[{"href":"https:\/\/sharpinterview.online\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=23918"}],"wp:term":[{"taxonomy":"topic","embeddable":true,"href":"https:\/\/sharpinterview.online\/index.php?rest_route=%2Fwp%2Fv2%2Ftopic&post=23918"},{"taxonomy":"difficulty","embeddable":true,"href":"https:\/\/sharpinterview.online\/index.php?rest_route=%2Fwp%2Fv2%2Fdifficulty&post=23918"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}