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<article> <h1> 基于面向?qū)ο蟪绦蚯衅能浖攘?/h1> <div id="nslpimk" class="authorTimeSource"> <span>作者：</span> <span>時間：2009-10-20</span> <span>來源：網(wǎng)絡(luò)</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:150px;margin-right:0px; text-align:right;"> <div id="hzatxrd" class="nav0"> <ul> <li style="width:150px;"><a href="javascript:void(0);"><img src="http://www.ex-cimer.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />英飛凌汽車電子生態(tài)圈</a> <ul> <li style="width:150px;text-align:center;"><img src="http://www.ex-cimer.com/event/company/images/code_2.jpg" width="150"><br />掃碼關(guān)注<br />獲取最新最全汽車電子<br />技術(shù)方案與實(shí)用技巧</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="wbundva" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="hxfwfjd" class="content" id="contentDiv" style="position:relative;"> <div id="tyncvdt" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><br />3．2 <a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/軟件"><em>軟件</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/度量"><em>度量</em></a>技術(shù)的研究<br /> <a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/軟件"><em>軟件</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/度量"><em>度量</em></a>是一個在近幾十年研究非?；钴S的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/軟件"><em>軟件</em></a>工程領(lǐng)域。抽象來講，它是一個函數(shù)，其輸入是軟件，輸出是單一的數(shù)值，能解釋軟件所具有的一個給定屬性對軟件質(zhì)量的影響。用于預(yù)測、評估和控制軟件開發(fā)的過程，促進(jìn)項(xiàng)目的成功，開發(fā)出高質(zhì)量的產(chǎn)品。<br /> 軟件<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/度量"><em>度量</em></a>主要包括復(fù)雜性度量、模塊性度量、易修改性度量、易移植性度量、可擴(kuò)充性度量、可靠性度量、易維護(hù)性度量、測試充分性度量等。有些可以用數(shù)值表示，稱為“定量度量”；不能用單一數(shù)值表達(dá)的稱為“定性度量”。研究集中在定量度量方面的內(nèi)聚度和耦合度的度量，這兩個方面是衡量軟件質(zhì)量非常重要的標(biāo)準(zhǔn)。二者之間密切相關(guān)，模塊之間的強(qiáng)耦合通常意味著弱內(nèi)聚，而模塊之間的強(qiáng)內(nèi)聚則意味著弱耦合。</p>本文引用地址：<a href="http://www.ex-cimer.com/article/181197.htm">http://www.ex-cimer.com/article/181197.htm</a><p>4 利用<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/程序"><em>程序</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/切片"><em>切片</em></a>技術(shù)進(jìn)行軟件度量<br /> 軟件開發(fā)的目標(biāo)是開發(fā)出高內(nèi)聚和低耦合的系統(tǒng)。這里研究利用<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/切片"><em>切片</em></a>技術(shù)度量<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/面向"><em>面向</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/對象"><em>對象</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/程序"><em>程序</em></a>的內(nèi)聚度和耦合度，尤其是內(nèi)聚度量。<br />4．1 耦合度量<br /> 耦合度(Coupling Degree)用來測量由兩個或多個模塊連接而引起的聯(lián)結(jié)程度的強(qiáng)弱。強(qiáng)耦合使模塊連接后的系統(tǒng)變得復(fù)雜。因?yàn)槟K之間具有高度的關(guān)聯(lián)，改寫模塊將十分困難。降低模塊間的耦合則可以減少系統(tǒng)的復(fù)雜性。因此，在系統(tǒng)設(shè)計(jì)中應(yīng)追求盡可能松散的耦合關(guān)系。<br />4．2 內(nèi)聚度量<br /> 內(nèi)聚度(Cohesion Degree)是軟件的內(nèi)在屬性，反映軟件設(shè)計(jì)和實(shí)現(xiàn)中模塊組件之間結(jié)合的緊密程度。高內(nèi)聚的軟件模塊有著最基本的功能，很難再切割其規(guī)模。<br /> <a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/面向"><em>面向</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/對象"><em>對象</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/程序"><em>程序</em></a>的基本特征是類。類由屬性和方法組成，屬性和方法間存在3種關(guān)系，因此類內(nèi)聚度也從3個方面度量：屬性問內(nèi)聚度、方法與屬性問內(nèi)聚度、方法問內(nèi)聚度。設(shè)類C共有n個屬性，m個方法，其中m，n≥0。V＿Union表示所有成員變量。M_Union表示所有成員方法。這里使用數(shù)據(jù)標(biāo)記(data token)而非語句作為基本單元來修正<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/切片"><em>切片</em></a>這個概念。數(shù)據(jù)切片包含和切片變量存在依賴關(guān)系的數(shù)據(jù)集合，簡寫作DataSlice(L，V)，其中L表示程序中的某個點(diǎn)，通常情況下特指某條語句：V表示在L定義或使用的變量的集合；#表示勢操作，表示集合中元素的個數(shù)。則屬性間內(nèi)聚度、方法與屬性間內(nèi)聚度和方法間內(nèi)聚度的計(jì)算公式分別為式(1)~(3)，如下所示：</p><p> <img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" style="WIDTH: 338px" height="246" src="http://editerupload.eepw.com.cn/fetch/20131009/181197_2_0.jpg" width="338" border="0" /></p><p><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" src="http://editerupload.eepw.com.cn/fetch/20131009/181197_2_1.jpg" width="300" border="0" /></p><p>4．3 實(shí)驗(yàn)操作<br /> 采用目前最主流的程序切片技術(shù)，以系統(tǒng)依賴圖為基礎(chǔ)，利用圖的可達(dá)性算法獲得切片結(jié)果。然后利用將切片結(jié)果代入式(1)～(3)進(jìn)行計(jì)算，得到內(nèi)聚度。<br /> 以下面的程序?yàn)槔M(jìn)行切片，計(jì)算內(nèi)聚度，并和<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/基于"><em>基于</em></a>依賴性分析的類內(nèi)聚度度量方法相對比。</span>  <div class="wwpxtyo" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img src="https://webstorage.eepw.com.cn/images/display/reg.jpg" border="0" usemap="#Map" /> <map name="Map" id="Map"> <area shape="rect" coords="133,235,319,253" target="_blank" /> <area shape="rect" coords="132,315,319,335" /> </map> </center> </div>  <span id="lxqqyad" class="hAd8"> <br></span>  <div id="urollbr" class="quotes"> <a href="181197.htm">上一頁</a> <a href="181197.htm">1</a> <span id="ugoavlf" class="current">2</span> <a href="181197_3.htm">3</a> <a href="181197_3.htm">下一頁</a> </div>  </div> </article> <div id="nswlucl" class="clear"></div> <br/> <div id="getiqcv" class="hAd6"> <div class="dimzzpq" id="relA" style="width:auto;height:auto;"> <ul> <li>  <iframe id='af71d594' name='af71d594' 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