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並前往https://www.quora.com/How-do-you-add-an-element-to-an-arraylist-thats-in-a-hashmap

How to add an element to an arraylist that's in a hashmap

HashMap <Integer,ArrayList<Integer>> map= new HashMap<Integer,ArrayList<Integer>>(); · map.put(1,new ArrayList<Integer>()); · ArrayList<Integer> list=map.get(1);.

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