java.util.HashMap
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| Operations |
Time Complexity |
Notes |
| get, put |
O(1) |
assuming the hash function has dispersed the elements properly among the buckets |
| iteration over collection views |
proportional to the capacity plus the size |
do not set the initial capacity too high or the load factor too low |
- Making no guarantees to the iteration order and the constantness of the order over time either.
- Unsynchronized and permitting nulls(both for key and value)
- 未完待续
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