this（）和super（）只能位于构造函数中的第一句
this（）和super（）只能位于构造函数中的第一句
相关考题：
Which two statements are true about the security-related tags in a valid Java EE deployment descriptor？（）A、Every tag must have at least one tag.B、A tag can have many tags.C、A given tag can apply to only one tag.D、A given tag can contain from zero to many tags.E、It is possible to construct a valid tag such that，for a given resource，no user rolescan access that resource.
public class Alpha{ public static void main（ string[] args ）{ if （ args.length == 2 ） { if （ args.[0].equalsIgnoreCase（“-b”） ） System.out.println（ new Boolean（ args[1] ））； } } } And the code is invoked by using the command： java Alpha –b TRUE What is the result？（） A、 trueB、 nullC、 falseD、 Compilation fails.E、 The code runs with no output.F、 An exception is thrown at runtime.
When adding a element to a web application deployment descriptor， the inclusion of which sub-element requires the definition of an error page（）？A、 realm-name B、 auth-metod C、 auth-constraint D、 form-login-config E、 user-data-constaint
下面有关struts1和struts2的区别，描述错误的是（）。A、Struts1要求Action类继承一个抽象基类。Struts 2 Action类可以实现一个Action接口B、Struts1 Action对象为每一个请求产生一个实例。Struts2 Action是单例模式并且必须是线程安全的C、Struts1 Action 依赖于Servlet API，Struts 2 Action不依赖于容器，允许Action脱离容器单独被测试D、Struts1 整合了JSTL，Struts2可以使用JSTL，但是也支持OGNL
Which is true about the web container request processing model？（）A、The init method on a filter is called the first time a servlet mapped to that filter is invoked.B、A filter defined for a servlet must always forward control to the next resource in the filter chain.C、Filters associated with a named servlet are applied in the order they appear in the web application deployment descriptor file.D、If the init method on a filter throws an UnavailableException， then the container will make no further attempt to execute it.