import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

class Main {
	public static void main(String argv[]) {

		ArrayList<Integer> list = new ArrayList<Integer>();
		list.add(1);
		list.add(2);
		list.add(4);

		// Filter - adapter, count - consumer.
		long test = list.stream().filter((num) -> num > 1).count();



		// ForEach - adapter.
		list.stream().forEach((num) -> {
			System.out.println(num);
		});

		// The same.
		for (int num : list) {
			System.out.println(num);
		};


		// Map - adapter, collect - consumer.
		List<String> newList = list
					.stream()
					.map((el) -> {
						return el.toString().concat(" Hello");
					})
					.collect(Collectors.toList());


		// The same.
		List<String> newList1 = new ArrayList<String>();
		for (Integer elem : list) {
			String tmp = elem.toString().concat(" Hello");
			newList1.add(tmp);
		}


		System.out.println(newList);
		System.out.println(newList1);

	}
}