Items:
1. shallow copy & deep copy
2. construct methods
3. complexity and speed
4. sort and consistent with equals, ref Comparable interface
5. collection与set的差异, 重复元素. collection范畴更大
6. modifiable and unmodifiable / mutable and immutable
7. Map and Map.Entry, Map.SimpleEntry, Map.SimpleImmutableEntry
8. sorted
9. hashcode()和equals的问题 in HashMap
10.Map中key是管理和操作的着力点,value不是.
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