下面程序运行的结果是 class Book{ int width; int length; } public class A{ static void f(Book p){ p.width=20; p.length=40; } public static void main(String args[]){ Book b=new Book(); b.width=10; b.length=20; f(b); System.out.print(b.width+" "); System.out.print(b.length+" "); } }