Marcus Li

Marcus Li

Learning Javascript, Java and algrithm now, this is a place to record my coding footprint.

HashMap vs TreeMap

less than 1 minute read

  1. HasbMap based on hashtable.
  2. HashMap dont have natural order, but Tree Map has. such as: treeMap.keySet() is incresed set of number // treeMap.descendingKeySet(), is decresed set of number
  3. HashMap and TreeMap both allowe duplicated number. such as: hashMap.put( 1, “idiots”) then hasMap.put(1, “brilliant”), the second time put() will overwrite the old one.

Updated:

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wrong value: $(window).height()

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$(window).height() gets the same value with $(document).height() , because I forgot to add <!DOCTYPE html> Source