Sample using Java Stream

Java8EvenNumberStream.java

	Random random = new Random();
	List<Integer> list = new ArrayList<>();

	//create a list of random integers using stream.
	//Don't have to be like this, just to show off 
	//because we are talking about stream
	List<Integer> list = IntStream.range(0, 20)
		 .map(i -> random.nextInt(100))
		 .boxed() //turns IntStream into Stream<Integer>
		 .collect(Collectors.toList()); //will be discussed in advance stream usage

	System.out.printf("Generated list: %s \n", list);

	//filter out all odd numbers from list
	//then power by 2
	list.stream()
	    .filter(i -> i % 2 == 0) //filter out the odd number
	    .map(i -> i * i) // Map function: power the even number by 2. Take it easy, I know Math.pow method
	    .forEach(System.out::println) // terminal operation. print out the result