Lazy Streams and side effects

package vertigo.app;

import java.util.stream.Stream;

public class LazyTest {

    public static void main(String[] args) {
        example1();
        example2();
    }

    /** try to enable println and predict the output */
    public static void example1() {
        System.out.println("lazy streams and side effects");
        Stream<Integer> s0 = Stream.of(1, 2, 4, 8, 45, 11);
        Stream<Integer> s1 = s0.filter(x -> {
            //System.out.println("x <<< " + x);
            return x < 20;
        });
        Stream<Integer> s2 = s1.filter(x -> {
            //System.out.println("x >>> " + x);
            return x > 2;
        });
        s2.forEach(System.out::println);
    }

    /** is the code safe? */
    public static void example2() {
        System.out.println("lazy streams and exceptions");
        Stream<Integer> s0 = Stream.of(1, 2, 0, 8, 45, 11);
        Stream<Double> s1;
        try {
            s1 = s0.map(x -> 1.0 / x);
        } catch (Exception e) {
            // found division by zero, return empty stream
            s1 = Stream.empty();
        }
        s1.forEach(System.out::println);
    }
}