Чтобы добавить элемент в список в Java, нужно воспользоваться методом add() класса ArrayList или любого другого класса, реализующего интерфейс List
Пример:
List<Integer> numbers = new ArrayList<>();
numbers.add(10);
numbers.add(20);
Здесь мы создали список numbers типа ArrayList<Integer> и добавили в него два элемента: 10 и 20.
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