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This article mainly explains "how final modifies Map List". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how final modifies Map List".

Public static void main (String [] args) {

Final Integer integer = new Integer (1)

/ / integer = 2

/ / error: unable to assign value to the final variable integer; reason: the basic data type modified by final is not allowed to be changed

Final Map map = new HashMap () {{

This.put ("a", "a")

}}

Map.put ("a", "a"); / / No error, final-modified Map allows value changes because final modifies references to map, not content

/ / map = new HashMap (); / / error: unable to assign value to the final variable map reason: final-modified map cannot modify its reference

}

Final-decorated List, like Map, can change internal values and is not allowed to point to new addresses.

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