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Explain What data structure should be used when number of elements is fixed?

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What data structure should be used when number of elements is fixed? (a) Array (b) Array list (c) Vector (d) Set This question was posed to me during an online interview. This interesting question is from Coding best practices topic in portion Autoboxing & Miscellaneous of Java Select the correct answer from above options

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Right choice is (a) Array For explanation I would say: Array list has variable size. Array is stored in contiguous memory. Hence, reading is faster. Also, array is memory efficient.

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