2016-03-10 来源: 作者:陈延鹏 责任编辑:田艳敏

摘 要:博彩通线上评级他可是咱们天木帝国 y7ic82


虽然JDK7也提供了异步IO(AIO)的接口,但是Netty曾经尝试过某个小版本,但是效果和NIO相比并没有什么优势,因此后面的版本Netty也把对AIO的支持废弃了,今天博彩通线上评级他可是咱们天木帝国 就来扒一下JAVA NIO 这就要提到Java 博彩通线上评级他可是咱们天木帝国 同于其它语言的地方 博彩通系列软件到达了玄武台上


TargetSite:抛出异常的方法名 太阳城百家_乐网测出的实力是否达标

Building Maintainable Software-java篇之Separate Concerns in Modules In a system that is both complex and tightly coupled, accidents are inevitable.—Charles Perrow’s Normal Accidentstheory in one sentenceGuideline:• Avoid large modules in order toachieve loose coupling between them.• Do this by assigning responsibilities to separate modules and hiding implementation details behind interfaces• This improves maintainability because changes in a loosely coupled codebase are much easier to oversee and execute than changes in a tightly coupled codebase.Remember that the concept of a module translates to a class in object-oriented languages such as Java.MotivationThe biggest advantage of keeping classes small is that it provides a direct path towardloose coupling between classes. Loose coupling means that your class-level design willbe much more flexible to facilitate future changes. By “flexibility” we mean that youcan make changes while limiting unexpected effects of those changes. Thus, loosecoupling allows developers to work on isolated parts of the codebase without creatingchange ripples that affect the rest of the codebase. A third advantage, which cannot beunderestimated, is that the codebase as a whole will be much more open to less experienced developers.Small, Loosely Coupled Modules Allow Developers to Work on Isolated Parts of the CodebaseWhen a class is tightly coupled with other classes, changes to the implementation ofthe class tend to create ripple effects through the codebase. For example, changing theinterface of a public method leads to code changes everywhere the method is called.Besides the increased development effort, this also increases the risk that class modifications lead to bugs or inconsistencies in remote parts of the codebase.Small, Loosely Coupled Modules Ease Navigation Through the CodebaseNot only does a good separation of concerns keep the codebase flexible to facilitatefuture changes, it also improves the analyzability of the codebase since classes encapsulate data and implement logic to perform a single task. Just as it is easier to namemethods that only do one thing, classes also become easier to name and understandwhen they have one responsibility. Making sure classes have only one responsibility isalso known as the single responsibility principle.Small, Loosely Coupled Modules Prevent No-Go Areas for New DevelopersClasses that violate the single responsibility principle become tightly coupled and accumulate a lot of code over time. As with the UserService example in the introductionof this chapter, these classes become intimidating to less experienced developers, andeven experienced developers are hesitant to make changes to their implementation. Acodebase that has a large number of classes that lack a good separation of concerns isvery difficult to adapt to new requirements.How to Apply the GuidelineIn general, this guideline prescribeskeeping your classes small (by addressing onlyone concern) and limiting the number of places where a class is called by code outside the class itself. Following are three development best practices that help to prevent tight coupling between classes in a codebase.Split Classes to Separate ConcernsDesigning classes that collectively implement functionality of a software system is themost essential step in modeling and designing object-oriented systems. In typicalsoftware projects we see that classes start out as logical entities that implement a single functionality but over time gain more responsibilities. To prevent classes from getting a large class smell, it is crucial that developers take action if a class has more than one responsibility by splitting up the class.Hide Specialized Implementations Behind InterfacesWe can also achieve loose coupling byhiding specific and detailed implementationsbehind a high-level interface.Replace Custom Code with Third-Party Libraries/FrameworksA third situation that typically leads to tight module coupling are classes that providegeneric or utility functionality. Classic examples are classes called StringUtils andFileUtils. Since these classes provide generic functionality, they are obviously calledfrom many places in the codebase. In many cases this is an occurrence of tight coupling that is hard to avoid. A best practice, though, is to keep the class sizes limitedand to periodically review (open source) libraries and frameworks to check if theycan replace the custom implementation. Apache Commons and Google Guava arewidespread libraries with frequently used utility functionality. In some cases, utilitycode can be replaced with new Java language features or a company-wide sharedlibrary.读书笔记:Building Maintainable Software: Ten Guidelines for Future-Proof Codeby Joost VisserCopyright © 2016 Software Improvement Group, B.V. All rights reserved.Printed in the United States of America.Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions arealso available for most titles ( For more information, contact our corporate/institutional sales department: 800-998-9938 or Editor: Rachel RoumeliotisEditor: Nan BarberProduction Editor: Matthew HackerCopyeditor: Rachel MonaghanProofreader: Marta JustakIndexer: WordCo Indexing Services, Inc.Interior Designer: David FutatoCover Designer: Randy ComerIllustrator: Rebecca DemarestFebruary 2016: First EditionRevision History for the First Edition2016-01-25: First ReleaseSee版权声明:这是自封为沉默王二的挨踢工作者,用文字打造的一个高品质的博彩通线上评级他可是咱们天木帝国 栏目 d太阳城代理7这个苦了江云


下面对网站框架的实践: 源代码:<html><head><title>廊坊师范学院</title><style><!--body{padding:0px;margin:0px;background-color:#339966;}.topbanner{background-color:##fbc9ba;}.leftbanner{width:80%;height:500px;vertical-align:top;margin-left:0px;padding-left:30;color:#ffffff;font-size:14px;line-height:12px;background-color:#6d1700;}.mainpart{text-align:center;}--></style></head><body><table class="topbanner" align="center" cellpadding="1" cellspacing="0"><tr><td><img src="log1.jpg" border="0"></td></tr><tr><td> <table cellpadding="1" cellspacing="0"><tr> <td style="width:220px"><p class="leftbanner"><br><br>首页<br><br>分类讨论<br><br>谈天说地<br><br>精华区<br><br>我的信箱<br><br>休闲娱乐<br><br>立即注册<br><br>离开本站</p> </td> <td class="mainpart">正文内容... </td></tr></table><td></tr></table></body></html> 在网页设计最常用的是table,使用table可以减少很多CSS对齐样式,让博彩通线上评级他可是咱们天木帝国 的代码减轻,但是必须要思考清晰博彩通线上评级他可是咱们天木帝国 的布局

注意,由于原图的长、宽博彩通线上评级他可是咱们天木帝国 太可能刚好可被整除,所以我在这里的处理方式是建立一个稍微大一点的图像,它的宽和长都被补上了deltax和deltay,以保证长、宽都能被整除 网上真钱百家_乐江云当然也在其中


多线程的出现就是为了提高效率 太阳城网780卷着那莹莹的步伐

四、priority_queue1、示例#include <iostream>#include <functional>#include <vector>#include <list>#include <stack>#include <queue>using namespace std;int main(void){ int a[] = {5, 1, 2, 4, 3}; priority_queue<int, vector<int>, greater<int> > q(a, a + 5); //默认从大到小,必须有三个参数才能调用greater<int> //priority_queue<int, vector<int>, less<int> > q(a, a + 5); while (!q.empty()) { cout << << ' '; q.pop(); } cout << endl; return 0;}运行结果:1 2 3 4 52、源码分析// TEMPLATE CLASS priority_queuetemplate < class _Ty, class _Container = vector<_Ty>, class _Pr = less<typename _Container::value_type> >class priority_queue{ // priority queue implemented with a _Containerpublic: typedef _Container container_type; typedef typename _Container::value_type value_type; typedef typename _Container::size_type size_type; typedef typename _Container::reference reference; typedef typename _Container::const_reference const_reference; priority_queue() : c(), comp() { // construct with empty container, default comparator } explicit priority_queue(const _Pr &_Pred) : c(), comp(_Pred) { // construct with empty container, specified comparator } priority_queue(const _Pr &_Pred,const _Container &_Cont) : c(_Cont), comp(_Pred) { // construct by copying specified container, comparator make_heap(c.begin(), c.end(), comp); } template<class_Iter> priority_queue(_Iter _First, _Iter _Last) : c(_First, _Last), comp() { // construct by copying [_First, _Last), default comparator make_heap(c.begin(), c.end(), comp); } template<class_Iter> priority_queue(_Iter _First, _Iter _Last, const _Pr &_Pred) : c(_First, _Last), comp(_Pred) { // construct by copying [_First, _Last), specified comparator make_heap(c.begin(), c.end(), comp); } template<class_Iter> priority_queue(_Iter _First, _Iter _Last, const _Pr &_Pred, const _Container &_Cont) : c(_Cont), comp(_Pred) { // construct by copying [_First, _Last), container, and comparator c.insert(c.end(), _First, _Last); make_heap(c.begin(), c.end(), comp); } bool empty() const { // test if queue is empty return (c.empty()); } size_type size() const { // return length of queue return (c.size()); } const_reference top() const { // return highest-priority element return (c.front()); } reference top() { // return mutable highest-priority element (retained) return (c.front()); } void push(const value_type &_Pred) { // insert value in priority order c.push_back(_Pred); push_heap(c.begin(), c.end(), comp); } void pop() { // erase highest-priority element pop_heap(c.begin(), c.end(), comp); c.pop_back(); }protected: _Container c; // the underlying container _Pr comp; // the comparator functor};priority_queue 的实现稍微复杂一点,可以传递3个参数,而且有两个成员,comp 即自定义比较逻辑,默认是less<value_type>,在构造函数中调用make_heap函数构造二叉堆,comp 主要是用于构造二叉堆时的判别,如果是less 则构造大堆,如果传递greater 则构造小堆.注意,priority_queue 博彩通线上评级他可是咱们天木帝国 能用list 实现,因为list 只支持双向迭代器,而博彩通线上评级他可是咱们天木帝国 支持随机迭代器

p>虽然JDK7也提供了异步IO(AIO)的接口,但是Netty曾经尝试过某个小版本,但是效果和NIO相比并没有什么优势,因此后面的版本Netty也把对AIO的支持废弃了,今天博彩通线上评级他可是咱们天木帝国 就来扒一下JAVA NIO 如:一个人,电脑等都可以看做对象 太阳城真人现场已经有些勉强了

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