System.out.println(null);
-----------> compilation error
System.out.println((Object)null);
-----------> output null
System.out.println(null);
-----------> compilation error
System.out.println((Object)null);
-----------> output null
http://groups.google.com/group/glassfish_china/web/glassfish?hl=zh-CN&hl=zh-CN
Junit小入門 1、 編寫功能代碼類: package leon.junit.test; public class AddOperation