package lambdasinaction.chap8; import java.util.*; public class Debugging{ public static void main(String[] args) { List<Point> points = Arrays.asList(new Point(12, 2), null); points.stream().map(p -> p.getX()).forEach(System.out::println); } private static class Point{ private int x; private int y; private Point(int x, int y) { this.x = x; this.y = y; } public int getX() { return x; } public void setX(int x) { this.x = x; } } }