Mastering Java 2026 – 400 Free Practice Questions to Pass the 'Thinking in Java' Exam

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.