Scope of a Declaration
6.3. Scope of a Declaration
The scope of a declaration of a member m
declared in or inherited by an interface type I (§9.1.4) is the entire body of I, including any nested type declarations.
interface I{ class C{} static class D{} }
The scope of a class's type parameter (§8.1.2) is the type parameter section of the class declaration, the type parameter section of any superclass or superinterface of the class declaration, and the class body.
The scope of an interface's type parameter (§9.1.2) is the type parameter section of the interface declaration, the type parameter section of any superinterface of the interface declaration, and the interface body.
interface IU<T>{ } class CU<T>{} public class main3<X extends Number> extends CU<X> implements IU<X> { }
The scope of a constructor's type parameter (§8.8.4) is the entire declaration of the constructor, including the type parameter section, but excluding the constructor modifiers.
public class main3{ public <A,B extends A> main3(){ } }
The scope of a local variable declaration in a block (§14.4) is the rest of the block in which the declaration appears, starting with its own initializer and including any further declarators to the right in the local variable declaration statement.
int a = 1,b = a;
The scope of a local variable declared in the ForInit part of a basic for
statement (§14.14.1) includes all of the following:
Its own initializer
Any further declarators to the right in the ForInit part of the
for
statementThe Expression and ForUpdate parts of the
for
statementThe contained Statement
ForInit、ForInitializer与ForUpdate
The scope of a local variable declaration in a block (§14.4) is the rest of the block in which the declaration appears, starting with its own initializer and including any further declarators to the right in the local variable declaration statement.
class Test1 { static int x; public static void main(String[] args) { int x = x; } }
This program causes a compile-time error because the initialization of x
is within the scope of the declaration of x
as a local variable, and the local variable x
does not yet have a value and cannot be used.
Scope of a Declaration的更多相关文章
- [No000077]打造自己的Eclipse
下载官网的Eclipse IDE for Java EE Developers 在根目录下的eclipse.ini文件中添加"-Dfile.encoding=UTF-8", 作用: ...
- 【对象模型】C++模版的编译链接过程——编译器真的会检查所有tocken层面的错误么?
模版(template)设计的初衷,是设计一种自动实例化机制,不需要使用者参与,编译器可根据使用者提供的模版参数再套用类的定义来实例化.所谓实例化,除了包含对于程序变量的实例化,即开辟空间并设置某些变 ...
- C++名字空间/C++命名空间
0.序言 名字空间是C++提供的一种解决符号名字冲突的方法. 一个命令空间是一个作用域,在不同名字空间中命名相同的符号代表不同的实体. 通常,利用定义名字空间的办法,可以使模块划分更加方便,减少模块间 ...
- JAVASCRIPT的一些知识点梳理
春节闲点,可以安心的梳理一下以前不是很清楚的东东.. 看的是以下几个URL: http://web.jobbole.com/82520/ http://blog.csdn.net/luoweifu/a ...
- W3C词汇和术语表
以A字母开头的词汇 英文 中文 abstract module 抽象模组 access 访问.存取 access control 存取控制 access control information 存取控 ...
- “Clang” CFE Internals Manual---中文版---"Clang"C语言前端内部手册
原文地址:http://clang.llvm.org/docs/InternalsManual.html 译者:史宁宁(snsn1984) "Clang"C语言前端内部手册 简介 ...
- The Go Programming Language. Notes.
Contents Tutorial Hello, World Command-Line Arguments Finding Duplicate Lines A Web Server Loose End ...
- 如何看破真假美猴王 ? --java中的Shadowing和Obscuring
故事背景 <西游记>第五十七回:唐僧因悟空又打死拦路强盗,再次把他撵走.六耳猕猴精趁机变作悟空模样,抢走行李关文,又把小妖变作唐僧.八戒.沙僧模样,欲上西天骗取真经.真假二悟空从天上杀到地 ...
- 前端与编译原理——用JS写一个JS解释器
说起编译原理,印象往往只停留在本科时那些枯燥的课程和晦涩的概念.作为前端开发者,编译原理似乎离我们很远,对它的理解很可能仅仅局限于"抽象语法树(AST)".但这仅仅是个开头而已.编 ...
随机推荐
- (并查集 带关系)Find them, Catch them -- poj -- 1703
链接: http://poj.org/problem?id=1703 Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 3676 ...
- JVM GC 机制与性能优化
目录(?)[+] 1 背景介绍 与C/C++相比,JAVA并不要求我们去人为编写代码进行内存回收和垃圾清理.JAVA提供了垃圾回收器(garbage collector)来自动检测对象的作用域),可自 ...
- Spring全局异常处理
最近学习Spring时,认识到Spring异常处理的强大.之前处理工程异常,代码中最常见的就是try-catch-finally,有时一个try,多个catch,覆盖了核心业务逻辑: 1 try{ 2 ...
- nginxのerror_logはformat指定できない.
備忘録です. http://toshitanian.hatenablog.com/entry/2013/10/25/023838 2013-10-25 nginxのerror_logはformat指定 ...
- Android-封装JSON数据(JSON对象/JSON数组)
Android-封装JSON数据(JSON对象/JSON数组),一般情况下不会在Android端封装JSON的数据,因为封装JSON的数据是在服务器端进行封装了,Android更多的工作是解析(JSO ...
- Excel2010画动态甘特图
哈哈!你居然真的看简介点进来啦,我也想八一八Henry gantt本人的故事,可是我查了好些资料,一个槽点都没有发现,不过人生经历还是蛮拼的: 此人活了58年,前半生就是一个中规中距的机械工程师&am ...
- django drf Token验证
https://www.django-rest-framework.org/api-guide/authentication/#basicauthentication 1.INSTALLED_APPS ...
- 爬虫实战1:使用requests和正则爬取电影信息
代码如下 # coding=utf-8 import requests from requests.exceptions import RequestException import re impor ...
- 安装gensim报错:Original error was: DLL load failed: 找不到指定的模块。 Command "python setup.py egg_info" failed with error code 1 in C:\Users\xubing\AppData\Local\Temp\pip-install-nta89iep\gensim\
1.pip install --upgrade setuptools #安装或升级 2.如果是基于numpy的python 包,升级numpy pip install -U numpy 3.重新pip ...
- 写给移动开发者的 React Native 指南
本文原创版权归 简书 wingjay 所有,如有转载,请于文章篇头位置显示标注原创作者及出处,以示尊重! 作者:wingjay 出处:http://www.jianshu.com/p/b8894425 ...