public class FunctionalProgramming {

public static void main(String[] args) {

printListTraditional(List.of(1, 2, 3, 4, 5, 7, 8, 9, 33, 10));

printListFunctional(List.of(1, 2, 3, 4, 5, 7, 8, 9, 33, 10));

printEvenNumbersFunctional(List.of(1, 2, 3, 4, 5, 7, 8, 9, 33, 10));

printStringUsingFunctional(List.of("Java", "REST", "Azure", "Spring", "AWS", "Docker", "Spring Boot", "Spring MVC"));

printSquareOfNumbersFunctional(List.of(1, 2, 3, 4, 5, 7, 8, 9, 33, 10));

}

private static void printSquareOfNumbersFunctional(List<Integer> numbers) {

numbers.stream().map(number -> number * number).forEach(System.out::print);

}

private static void printStringUsingFunctional(List<String> list) {

list.stream().forEach(System.out::print);

System.out.println();

list.stream().filter(string -> string.contains("Spring")).forEach(System.out::print);

System.out.println();

list.stream().filter(string -> string.length() >= 4).forEach(System.out::print);

System.out.println();

}

private static void printEvenNumbersFunctional(List<Integer> numbers) {

numbers.stream().filter(FunctionalProgramming::isEven).forEach(System.out::print);

System.out.println();

numbers.stream().filter(number -> number%2 == 0).forEach(System.out::print);

System.out.println();

numbers.stream().filter(number -> number%2 != 0).forEach(System.out::print);

System.out.println();

}

private static void printListFunctional(List<Integer> numbers) {

numbers.stream().forEach(FunctionalProgramming::print);

System.out.println();

numbers.stream().forEach(System.out::print);

System.out.println();

}

private static void printListTraditional(List<Integer> numbers) {

for (int number : numbers) {

System.out.print(number);

}

System.out.println();

}

private static void print(int num) {

System.out.print(num);

}

private static boolean isEven(int num) {

return num%2 == 0;

}

}