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questions on java.util package - Part 4

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Q7)Which of the following are true about BitSet
a] Individual bits cannot be examined, set or cleared.
b] The bit set will increase dynamically as needed to accommodate extra bits you add it.
Answer given : false, true.
Q8)Which of the following classes that are thread-safe?
a] HashMap and HashSet
b] Vector and HashSet
c] HashTable and Dictionary
d] Vector and HashTable
Answer given : d.
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