锘??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#57;&#57;&#20037;&#20037;&#31934;&#21697;&#20813;&#36153;&#30475;&#22269;&#20135;&#19968;&#21306;&#20108;&#21306;&#19977;&#21306;&#44;&#20037;&#20037;&#20037;&#20037;&#57;&#57;&#31934;&#21697;&#25104;&#20154;&#29255;&#44;&#20037;&#20037;&#20154;&#22971;&#23569;&#22919;&#23273;&#33609;&#65;&#86;&#26080;&#30721;&#19987;&#21306;</title><link>http://m.shnenglu.com/ArthasLee/archive/2011/03/04/141128.html</link><dc:creator>ArthasLee</dc:creator><author>ArthasLee</author><pubDate>Fri, 04 Mar 2011 12:49:00 GMT</pubDate><guid>http://m.shnenglu.com/ArthasLee/archive/2011/03/04/141128.html</guid><wfw:comment>http://m.shnenglu.com/ArthasLee/comments/141128.html</wfw:comment><comments>http://m.shnenglu.com/ArthasLee/archive/2011/03/04/141128.html#Feedback</comments><slash:comments>1</slash:comments><wfw:commentRss>http://m.shnenglu.com/ArthasLee/comments/commentRss/141128.html</wfw:commentRss><trackback:ping>http://m.shnenglu.com/ArthasLee/services/trackbacks/141128.html</trackback:ping><description><![CDATA[&nbsp;
<p><span>Q1</span><span>錛氫負浠�涔堢▼搴忕殑鏁版嵁闇�瑕佹斁鍦ㄥ爢銆佹爤涓や釜涓嶅悓錛堢敋鑷蟲洿澶氾級鐨勫湴鏂癸紵</span></p>
<p>&nbsp;</p>
<p><img border=0 alt="" src="http://m.shnenglu.com/images/cppblog_com/arthaslee/1.png" width=728 height=366></p>
<p><span>瀵逛簬鍫嗗拰鏍堜腑鐨勬暟鎹唴瀹規潵璇達細</span></p>
<p><span>鏍堬細緙栬瘧鍣ㄩ渶鐭ラ亾鏁版嵁鍐呭鐨勭敓瀛樺懆鏈熴�佷絾鏄彲浠ュ揩閫熺鐞嗗拰鍒嗛厤鏍堝唴瀛橈紱</span></p>
<p><span>鍫嗭細緙栬瘧鍣ㄦ棤闇�鐭ラ亾鏁版嵁鍐呭鐨勭敓瀛樺懆鏈燂紝淇濊瘉鐏墊椿鎬с�佷絾鏄垎閰嶅拰鍥炴敹鍐呭瓨涓嶅鎶婃暟鎹斁鍦ㄦ爤涓潵寰楀揩錛?/span></p>
<p>&nbsp;</p>
<p><span>Q2</span><span>錛氬璞″湪鍏剁敓鍛藉懆鏈熺粨鏉熷悗緇忓巻浠�涔堟楠よ�屽悗琚噴鏀撅紵閿�姣佹満鍒跺叿浣撴槸鎬庢牱鐨勶紵搴曞眰閫氳繃浠�涔堝疄鐜幫紵</span></p>
<p><span>&nbsp;<img border=0 alt="" src="http://m.shnenglu.com/images/cppblog_com/arthaslee/2.png" width=711 height=120></span></p>
<p>&nbsp;</p>
<p><span>褰撶▼搴忔墽琛屽埌涓�涓潡</span><span>or</span><span>浣滅敤鍩燂紙</span><span>scope</span><span>錛夌殑緇撳熬錛屼細鑷姩娓呯悊鍏剁淮鎶ょ殑鏍堜腑鐨勫唴瀛樻暟鎹�?/span></p>
<p><span>浜庢槸錛屽鏋滀繚瀛樺湪鏍堜腑鐨勫敮涓�</span><span>reference</span><span>鎸傛帀浜嗭紝灝辨剰鍛崇潃鍐嶆病鏈夊姙娉曞彲浠ユ搷浣滃叾鍘熷厛寮曠敤鐨勫璞′簡銆?/span></p>
<p><span>浣嗘槸淇濆瓨鍦ㄥ爢涓殑瀵硅薄鍦ㄨ繖鏃跺�欒繕娌℃湁琚竻鐞嗘帀銆?/span></p>
<p>&nbsp;</p>
<p>&nbsp;<img border=0 alt="" src="http://m.shnenglu.com/images/cppblog_com/arthaslee/3.png" width=756 height=187></p>
<p>&nbsp;</p>
<p><span>瀵逛簬鍦ㄥ爢涓紝娌℃湁琚紩鐢ㄧ殑瀵硅薄銆傚瀮鍦懼洖鏀跺櫒浼氱洿鎺ユ妸浠栦滑鍗犳嵁鐨勫唴瀛樼┖闂撮噴鏀炬帀銆?/span></p>
<p><span>鐪熺殑濡備功涓墍璇達紝榪欑鏈哄埗婊存按涓嶆紡鍚楋紵浼氫笉浼氭湁闄烽槺錛?/span></p>
<p><u><span>浼氫笉浼氭湁涓�浜涗笉緇忔剰鐨勬搷浣滃鑷村紩鐢ㄨ鏁版案榪滀笉涓洪浂錛岀劧鑰岀敤鎴峰嵈鎳電劧涓嶇煡鍛紵</span></u></p>
<p><u><span>鍐呭瓨娉勬紡鐪熺殑鍙互鍦ㄧ湡姝ｆ剰涔変笂寰楀埌閬垮厤鍚楋紵</span></u></p>
<p>&nbsp;</p>
<p><span>Q3</span><span>錛氬瀮鍦懼洖鏀舵満鍒剁┒绔熻兘騫蹭粈涔堬紝涓嶈兘騫蹭粈涔堬紵絀剁珶鏈川鏄粈涔堬紵</span> </p>
<p>&nbsp;</p>
<p>&nbsp;<img border=0 alt="" src="http://m.shnenglu.com/images/cppblog_com/arthaslee/4.png" width=715 height=224></p>
<p><span>鍨冨溇鍥炴敹鏈哄埗鍘熸潵鍙細瀵?/span><span>new</span><span>鍑烘潵鐨勫爢鍐呭瓨璧蜂綔鐢紒錛侊紒</span></p>
<p><span>涓囦竴涓嶆槸</span><span>new</span><span>鍑烘潵鐨勶紝閭ｈ繕鏄緱浜哄伐鍥炴敹&#8230;&#8230;</span></p>
<p style="FONT-FAMILY: Comic Sans MS; FONT-SIZE: 18pt">1銆乊ou might not get garbage collected錛?/p>
<p><span>鍝?#8230;&#8230;榪欐牱鐨勫瀮鍦懼洖鏀舵満鍒跺晩&#8230;&#8230;</span></p>
<p><img border=0 alt="" src="http://m.shnenglu.com/images/cppblog_com/arthaslee/6.png" width=750 height=155></p>
<p><span>榪樼湡鏄噿鍟?#8230;&#8230;</span></p>
<p>&nbsp;</p>
<p><span>鎬諱箣灝辨槸錛屽瀮鍦懼洖鏀舵満鍒跺彧浼氬洖鏀跺璞″湪鍫嗕腑鐨勫唴瀛橈紝浣嗙┒绔熻繖涓璞＄殑鎿嶄綔鏇劇粡騫蹭簡浠�涔堬紝鏈夋病鏈?#8220;鍘嗗彶閬楃暀闂&#8221;錛?/span><span>java</span><span>鏄竴姒備笉綆＄殑&#8230;&#8230;</span></p>
<p>&nbsp;<img border=0 alt="" src="http://m.shnenglu.com/images/cppblog_com/arthaslee/7.png" width=743 height=60></p>
<p>&nbsp;</p>
<p><span>榪欎釜鍨冨溇鍥炴敹鏈哄埗榪樻槸鍥炲埌鍥炲繂涓幓鍚?#8230;&#8230;錛堟垜娌″悙妲芥渶緇堝夠鎯籌紝鐪熺殑娌℃湁錛侊級</span></p>
<p>&nbsp;<img border=0 alt="" src="http://m.shnenglu.com/images/cppblog_com/arthaslee/8.png" width=750 height=162></p>
<p>&nbsp;</p>
<p><span>ClassName obj</span><span>錛?/span><span>//</span><span>灞�閮ㄥ璞★紝鏀懼湪鏍堜腑錛?/span><span>C++</span><span>鍙互榪欐牱錛?/span><span>java</span><span>涓嶈錛?/span></p>
<p><span>C++</span><span>鐨勫ソ澶勶細浣滅敤鍩熺粨鏉燂紝灞�閮ㄥ璞＄殑</span><span>destructor</span><span>鑷姩琚皟鐢紝閲婃斁鏍堜腑鍐呭瓨錛?/span></p>
<p>&nbsp;</p>
<p><span>New</span><span>鍑烘潵鐨勫璞★細</span></p>
<p><span>//C++</span><span>鐨勫潖澶勶細涓嶆墽琛?/span><span>delete</span><span>鐨勮瘽錛屽璞″崰鐢ㄧ殑鍐呭瓨浼氫竴鐩磋禆鍦ㄥ爢涓�傚氨璁╁唴瀛樻紡涓�浼氬効鍚с�?/span></p>
<p><span>//java</span><span>鐨勫ソ澶勶細涓嶇敤鏄懼紡鎵ц錛屽彧瑕佷綔鐢ㄥ煙緇撴潫錛?/span><span>reference</span><span>琚竻闄わ紝鍨冨溇鍥炴敹鍣ㄥ氨浼氳嚜鍔ㄥ洖鏀跺爢涓殑鍐呭瓨錛?/span></p>
<p><span>鑰屼笖錛?/span><span>java</span><span>鍏勮繕涓嶈浣犲湪鏍堜腑鍒涘緩灞�閮ㄥ璞″憿&#8230;&#8230;</span></p>
<p>&nbsp;</p>
<p><span>Q3/1</span><span>錛?u>閭ｇ┒绔?/u></span><u><span>new</span></u><u><span>鎿嶄綔鍙戠敓鐨勬椂鍊欙紝</span><span>java</span></u><u><span>璇█涓虹敤鎴峰共浜嗕粈涔堬紵</span><span>new</span></u><u><span>鐨勬搷浣滀篃浼氬寮曠敤璁℃暟浜х敓浣滅敤鈥斺�斾緥濡傚垵濮嬪寲鍜屽垱寤哄悧錛?/span></u><span>鍨冨溇鍥炴敹鍣ㄥ浣曞伐浣滃憿錛?/span></p>
<p>&nbsp;</p>
<p><img border=0 alt="" src="http://m.shnenglu.com/images/cppblog_com/arthaslee/9.png" width=731 height=155></p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p><span>鐩稿浜庡爢鑰岃█錛屽湪鏍堜腑閲婃斁鍜屽垎閰嶅唴瀛樿繕鏄晥鐜囪緝楂樸�傝繖鍙兘涔熸槸涓�浜涚▼搴忕殑鏁版嵁鏀懼湪鏍堜腑錛屼竴浜涙斁鍦ㄥ爢涓殑鍘熷洜涔嬩竴鍚э紵</span></p>
<p>&nbsp;</p>
<p><img border=0 alt="" src="http://m.shnenglu.com/images/cppblog_com/arthaslee/10.png" width=740 height=282></p>
<p>&nbsp;</p>
<p><span>寮曠敤璁℃暟綾諱技鏄竴涓璞′腑鐨勬垚鍛橈紱鏈変笢瑗垮紩鐢ㄥ璞★紝灝卞鍔?/span><span>1</span><span>錛屽綋鏈夊紩鐢ㄥ湪鏍堜腑琚噴鏀炬垨鑰呰涓?/span><span>NULL</span><span>錛屽氨鍑忓皯</span><span>1</span><span>錛涘彂鐜板紩鐢ㄨ鏁頒負</span><span>0</span><span>錛屽氨璇佹槑榪欎釜瀵硅薄宸茬粡娌′漢瑕佷簡&#8230;&#8230;</span></p>
<p><span>緙虹偣錛?/span></p>
<p><span>鍨冨溇鍥炴敹鍣ㄨ鎵弿鏁翠釜瀵硅薄鍒楄〃錛屾煡鎵懼紩鐢ㄨ鏁頒負</span><span>0</span><span>鐨勫璞★紱</span></p>
<p><span>濡傛灉鏈変袱涓璞＄宸х浉浜掑紩鐢ㄤ簡褰兼錛岄偅榪欎袱涓璞＄殑寮曠敤璁℃暟灝辯敤涓嶄負闆訛紝鍗充嬌娌′漢瑕佷篃涓嶄細琚竻闄ゆ帀錛?/span></p>
<p><span>鏈�鎮插偓鐨勬槸錛?/span></p>
<p><span>JVM</span><span>閮戒笉鏄�氳繃榪欑鏈哄埗瀹炵幇鍨冨溇鍥炴敹婊?#8230;&#8230;</span></p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p><span>JVM</span><span>鏄繖涔堝共鐨?#8230;&#8230;</span></p>
<p><img border=0 alt="" src="http://m.shnenglu.com/images/cppblog_com/arthaslee/11.png" width=726 height=214></p>
<p><span>閫嗗悜鎬濈淮錛屼笉鎵炬鐨勶紝鎵炬椿鐨勶紒浠庝竴涓紩鐢ㄥ嚭鍙戯紝閬嶅巻鍏跺璞?/span><span>-</span><span>鏍戯紙鑷繁浣滅殑錛夈�傞�忚繃姣忎竴涓湪鏍堜腑鎴栬�呭湪闈欐�佸尯涓繚瀛樼殑寮曠敤錛屼互涔嬩負鏍硅妭鐐癸紝閬嶅巻鐢變粬鍑哄彂鍙互鍒拌揪鐨勫璞¤妭鐐廣�?/span></p>
<p><span>濂藉錛?/span></p>
<p><span>涓嶇敤閬嶅巻鎵�鏈夊爢涓殑瀵硅薄銆?/span></p>
<p><span>瑙ｅ喅涓や釜瀵硅薄浜掔浉寮曠敤鑰屽鑷村紩鐢ㄨ鏁版亽涓嶄負</span><span>0</span><span>鐨勯棶棰橈紱</span></p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p><span>緇忚繃涓婅堪澶勭悊錛屾病琚壘鍒扮殑瀵硅薄浼氳娓呯悊鎺夛紝浣嗘槸浼氱暀涓嬪唴瀛樼鐗囷紝嫻垂絀洪棿銆傛墍浠?#8230;&#8230;</span></p>
<p><img border=0 alt="" src="http://m.shnenglu.com/images/cppblog_com/arthaslee/12.png" width=742 height=156></p>
<p><span>濡欙紒</span></p>
<p><span>鎶婄▼搴忓仠姝笅鏉ワ紝鎶婃椿鍔ㄧ殑瀵硅薄</span><span>copy</span><span>鍒版柊鐨勫爢鍐呭瓨錛岃繛緇瓨鏀撅紝榪欐牱灝辮吘鍑轟簡閭ｄ簺鍘熷厛鎴愪負紕庣墖鐨勭┖闂淬�?/span></p>
<p>&nbsp;</p>
<p><span>鐒惰�岋紝涓�鐩?/span><span>copy</span><span>鏉?/span><span>copy</span><span>鍘婚渶瑕佹湁棰濆鐨勫爢鍐呭瓨鏉ヤ繚瀛?/span><span>copy</span><span>鐨勬暟鎹紝瀹為檯涓?/span><span>copy</span><span>鍙戠敓鐨勬椂鍊欓渶瑕佸弻鍊嶄簬琚?/span><span>copy</span><span>鍐呭鐨勫爢鍐呭瓨鍚屾椂鍙敤銆?/span></p>
<p><span>鍏舵錛?/span><span>copy</span><span>涔熼渶瑕佹椂絀哄紑閿�&#8230;&#8230;</span></p>
<p><span>浜庢槸&#8230;&#8230;</span></p>
<p><span>JVM</span><span>灝辨妸</span><span>sweep-and-mark</span><span>鍜?/span><span>stop-and-copy</span><span>緇撳悎璧鋒潵錛?/span><span>thinking in java</span><span>鏈夎榪幫級</span></p>
<p><span>澶у璞″崰鐢ㄤ竴涓?/span><span>block</span><span>錛屾瘡涓?/span><span>block</span><span>鏈変竴涓?/span><span>generation count</span><span>浣滀負鍏跺彲鐢ㄤ笌鍚︾殑鏍囪銆?/span></p>
<p><span>涓�浜涘皬瀵硅薄鏀懼湪涓�涓?/span><span>block</span><span>閲岋紱</span></p>
<p><span>鏍規嵁寮曠敤鏉ラ亶鍘嗗叾瀵硅薄</span><span>-</span><span>鏍戠殑鎿嶄綔寮�濮嬫墽琛岋細</span></p>
<p><span>涓�鑸潵璇達紝澶у璞℃槸涓嶄細琚?/span><span>copy</span><span>鐨勶紱</span></p>
<p><span>灝忓璞′細琚鍒跺拰閲嶆柊綆＄悊錛岄噴鏀懼唴瀛樼鐗囷紱</span></p>
<p><span>JVM</span><span>鍦ㄧ鐗囧鐨勬椂鍊欒繘琛?/span><span>stop-and-copy</span><span>鏉ユ暣鐞嗙鐗囷紝鑵懼嚭絀洪棿錛涘湪鍫嗗唴瀛樿凍澶熷拰紕庣墖涓嶅鐨勬儏鍐典笅錛屽垯鍙墽琛?/span><span>sweep-and-mark</span><span>銆?/span></p>
<p>&nbsp;</p>
<p><span>鍦ㄨ繖鏍風殑鍨冨溇鍥炴敹鏈哄埗涓嬶紝鍙鏄?/span><span>new</span><span>鍑烘潵鐨勪笢瑗匡紝鐪熺殑閮借兘鍥炴敹浜嗐�傛煇紼嬪害涓婅繕鐪熸槸婊存按涓嶆紡鍟?#8230;&#8230;</span></p>
<p>&nbsp;</p>
<p><span>鏄劇劧鏄妱</span><span>IBM</span><span>澶у瀷鏈虹殑澶栧瓨綆＄悊鍢涳紒鏁版嵁闆嗘斁鍦?/span><span>block</span><span>涓紝琚垹闄ょ殑鏁版嵁闆嗙殑</span><span>block</span><span>鏍囪涓轟笉鍙敤錛屾柊寤虹殑鏁版嵁闆嗘斁鍦ㄥ悗闈㈢殑</span><span>block</span><span>涓�傚綋瀛樺偍絀洪棿涓嶅浜嗭紝鏁寸悊閭ｄ簺宸茬粡瀛樺湪鍙堝彲鐢ㄧ殑鏁版嵁闆嗭紝瀛樻斁鍦ㄤ竴鐗囪繛緇┖闂翠腑錛屾妸紕庣墖閲嶆柊鏁寸悊涓哄彲鐢ㄥ唴瀛橈紝鐪熸槸&#8230;&#8230;</span></p>
<p><span>鎶勫惂鎶勫惂錛屼笉鏄姜&#8230;&#8230;</span></p>
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