How do I add values to a Set inside a Map? [closed]

Answer 1

If you want to add multiple numbers to a set with one method, try this:

Map> map; // Definition


public void addValues(String key, Integer... values) {
    map.get(key).addAll(values);
}

This way, when you need to add a bunch of numbers for a key you can make a call like this:

addValues("apple", 1, 2, 4, 6, 8);

One line instead of 5.