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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 do you add an element to an arraylist that's in a hashmap?

map.put(1,list);. System.out.println(map);. The piece of code written above is just an example of how we can retrieve an ArrayList declared within a HashMap ...

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