Mastering Java: The Ultimate Quiz for 'Thinking in Java'

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In hashing, what causes a rehash to occur?

  1. When the load factor is exceeded

  2. After every insert operation

  3. Whenever a collision occurs

  4. When the hashtable is full

The correct answer is: When the load factor is exceeded

When using hashtables, a rehash occurs when the load factor, or the ratio of the number of elements in the hashtable to the size of the hashtable, exceeds a certain threshold. This allows for the hashtable to maintain its efficient time complexity for operations such as insertion and retrieval. Rehashing does not occur after every insert operation or whenever a collision occurs, as these events may not significantly affect the load factor. A rehash also does not occur when the hashtable is full, as this would result in the hashtable being unable to store any more elements.

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