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public class Main {

    public static <T> boolean contains(T[] array, T element) {
        for (T item : array) {
            if (item.equals(element)) {
                return true;
            }
        }
        return false;
    }

    public static void main(String[] args) {
        String[] names = {"Anna", "Ivan", "Maria"};

        System.out.println(contains(names, "Ivan"));
        System.out.println(contains(names, "Petr"));

        Integer[] numbers = {10, 20, 30, 40};

        System.out.println(contains(numbers, 30));
        System.out.println(contains(numbers, 50));
    }
}