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鎴戠殑java緙栫▼涓嶆槸姊︼紒錛侊紒 zh-cn Sun, 17 Jul 2011 23:04:04 GMT Sun, 17 Jul 2011 23:04:04 GMT 60 java 鏁版嵁綾誨瀷 http://www.aygfsteel.com/zj474097500/archive/2011/07/17/354497.html銈繪櫤鍐涖儫 銈繪櫤鍐涖儫 Sun, 17 Jul 2011 15:16:00 GMT http://www.aygfsteel.com/zj474097500/archive/2011/07/17/354497.html http://www.aygfsteel.com/zj474097500/comments/354497.html http://www.aygfsteel.com/zj474097500/archive/2011/07/17/354497.html#Feedback 0 http://www.aygfsteel.com/zj474097500/comments/commentRss/354497.html http://www.aygfsteel.com/zj474097500/services/trackbacks/354497.html java鏁版嵁綾誨瀷錛?/span>鏄竴縐嶅己綾誨瀷璇█錛岀涓嬈$敵鏄庡彉閲忓繀欏昏鏄庢暟鎹被鍨嬶紝絎竴嬈″彉閲忚祴鍊肩О涓哄彉閲忕殑鍒濆鍖栥?br /> 縐嶇被錛?縐嶅熀鏈被鍨嬶紙鍘熺敓綾誨瀷錛夛細鏁村瀷錛歜yte 瀛楄妭鍨?nbsp; 1Byte=8bit 256涓姸鎬?nbsp; -128~+127 short 鐭暣鍨?nbsp; 2Byte=16bit 64436 -32768~32767 int 鏁村瀷 4Btye=32bit 2^32 -2147483648~+2147483647 2^31=2^10*2^10*2^10*2 澶х害鍦ㄦ璐?1浜夸箣闂寸殑鏁?nbsp; k k k 2 =2G long 闀挎暣鍨?nbsp; 8Byte=64bit -2^63~2^63-1 char 瀛楃鍨?nbsp; 2Byte=16bit 0~65535 1+2+'a'+1+2絳変環浜?+2+97+1+2 嫻偣鍨?瀹炲瀷錛歠loat 鍗曠簿搴?nbsp; 4Byte=32bit 瀹為檯鏄?+1錛?涓綅鏉冿級f1=5.0F鎴杅 double 鍙岀簿搴?nbsp; 8Byte=64bit 瀹為檯鏄?+2錛?涓綅鏉冿級 甯冨皵綾誨瀷錛?nbsp; boolean 娉ㄦ剰錛氭誕鐐瑰瀷鏁版嵁鏃墮潪綺懼害瀛樺偍錛屾暣鍨嬫暟鎹負綺劇‘瀛樺偍銆傝屾暟鎹被鍨嬬殑瀛楅潰鍊兼湁榛樿鍊鹼細鏁村瀷涓篿nt錛屽疄鍨嬶細涓篸ouble double鍜孊igDecimal鐨勫尯鍒細double錛岄傚悎鍋氱瀛﹁繍綆?br /> BigDecimal錛岄傚悎鐢ㄥ晢涓氳繍綆?br /> BigDecimal b1 = new BigDecimal 錛?5.0"錛夛紱 BigDecimal b2 = new BigDecimal錛?3.1"錛夛紱 b1.subtract(b2); 鍑?nbsp; b1.divide錛坆2,4錛? 闄?br /> BigInteger 鏄敤浜庡ぇ鏁版嵁鐨勩傘傛瘮濡傛眰9鐨?9姝ゆ柟 5縐嶅紩鐢ㄧ被鍨嬶紙瀵硅薄綾誨瀷錛夛細綾?nbsp; 鎺ュ彛 鏁扮粍 鏋氫婦 鏍囨敞 絀虹被鍨嬶細void綾誨瀷 鏁版嵁綾誨瀷鐨勮漿鎹細鍙湁boolean涓嶅弬涓庢暟鎹被鍨嬬殑杞崲 錛?錛?鑷姩綾誨瀷鐨勮漿鎹細a.甯告暟鍦ㄨ〃鏁拌寖鍥村唴鏄兘澶熻嚜鍔ㄧ被鍨嬭漿鎹㈢殑 b.鏁版嵁鑼冨洿灝忕殑鑳藉鑷姩鏁版嵁綾誨瀷澶х殑杞崲錛堟敞鎰忕壒渚嬶級 int鍒癴loat錛宭ong鍒癴loat錛宭ong鍒癲ouble 鏄笉浼氳嚜鍔ㄨ漿鎹㈢殑錛屼笉鐒跺皢浼氫涪澶辯簿搴?br /> c.寮曠敤綾誨瀷鑳藉鑷姩杞崲涓虹埗綾葷殑 d.鍩烘湰綾誨瀷鍜屽畠浠寘瑁呯被鍨嬫槸鑳藉浜掔浉杞崲鐨?br /> 錛?錛?寮哄埗綾誨瀷杞崲錛氱敤鍦嗘嫭鍙鋒嫭璧鋒潵鐩爣綾誨瀷錛岀疆浜庡彉閲忓墠 8涓熀鏈被鍨嬬殑鍖呰綾伙細 Byte Short Integer Long Character Float Double Boolean 鍩烘湰綾誨瀷鐨勪紭鍔匡細鏁版嵁瀛樺偍鐩稿綆鍗曪紝榪愮畻鏁堢巼姣旇緝楂?br /> 鍖呰綾葷殑浼樺娍錛氭湁鐨勫鏄擄紝姣斿闆嗗悎鐨勫厓绱犲繀欏繪槸瀵硅薄綾誨瀷錛屾弧瓚充簡java涓鍒囩殕鏄璞$殑鎬濇兂 寮曠敤綾誨瀷錛氬簳灞傜粨鏋勫拰鍩烘湰綾誨瀷宸埆杈冨ぇ 棣栧厛浠嬬粛涓婮VM鐨勫唴瀛樼┖闂達細錛?錛? 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Stack 鏍堢┖闂達細涓存椂鍙橀噺 Student stu 錛?錛?Code 浠g爜鍖?錛氱被鐨勫畾涔夛紝闈欐佽祫婧?Student.class eg錛歋tudent stu = new Student錛堬級錛?br /> stu.study(); //new 鍦ㄥ唴瀛樼殑鍫嗙┖闂村垱寤哄璞?br /> //鎶婂璞$殑鍦板潃璧嬬粰stu寮曠敤鍙橀噺 涓婁緥瀹炵幇姝ラ錛歛.JVM鍔犺澆Student.class 鍒癈ode鍖?br /> b.new Student()鍦ㄥ爢絀洪棿鍒嗛厤絀洪棿騫跺垱寤轟竴涓猄tudent瀹炰緥 c.灝嗘瀹炰緥鐨勫湴鍧璧嬪肩粰寮曠敤stu錛?鏍堢┖闂?br /> 浠ヤ笂灝辨垜鍦ㄦ暟鎹被鍨嬩腑鎵璁や負姣旇緝閲嶈鐨勫唴瀹癸紝甯屾湜鑳界粰涓浜涗漢甯︽潵甯姪錛岃嫢鏈変漢榪樻湁鏇村閲嶈鐨勭煡璇嗭紝璇鋒彁鍑猴紝澶у涓璧峰垎浜佸涔犲摝錛佽阿璋?/span> ]]> java鍦╓indow鍜孶nix/Linux涓幆澧冨彉閲忕殑閰嶇疆 http://www.aygfsteel.com/zj474097500/archive/2011/07/15/354356.html銈繪櫤鍐涖儫 銈繪櫤鍐涖儫 Thu, 14 Jul 2011 16:11:00 GMT http://www.aygfsteel.com/zj474097500/archive/2011/07/15/354356.html http://www.aygfsteel.com/zj474097500/comments/354356.html http://www.aygfsteel.com/zj474097500/archive/2011/07/15/354356.html#Feedback 0 http://www.aygfsteel.com/zj474097500/comments/commentRss/354356.html http://www.aygfsteel.com/zj474097500/services/trackbacks/354356.html 涓銆侀厤緗墠鍑犱釜璇█鍚嶈瘝鐨勪粙緇嶏細1.JDK錛?java寮鍙戝伐鍏峰寘 瀹夎JDK src.zip鏄痡ava綾誨簱婧愪唬鐮?br /> jdk涓媌in錛氫簩榪涘埗鏂囦歡 binary jdk涓媗ib錛氳繍琛岀殑搴撴枃浠?nbsp; libary 2.JRE錛?Java榪愯鐜 lib/rt.jar 鏄痡ava鐨勬牳蹇冪被搴?br />3.JVM錛歫ava铏氭嫙鏈?br />4.GC錛?Java鍐呭瓨鍨冨溇鏀墮泦鏈哄埗錛屼篃鍙玪azy鎳掓儼鐨勬敹闆嗘満鍒?br /> 褰揓VM鍙戠幇鍐呭瓨涓嶈凍鏄紝鎵嶅惎鍔℅C綰跨▼鍥炴敹緋葷粺鍨冨溇錛孏C綰跨▼鏄緢娑堣楃郴緇熻祫婧愮殑 5.API錛?搴旂敤緙栫▼鎺ュ彛 java鐗規寚JavaDoc API鏂囨。 6.IDE錛?闆嗘垚寮鍙戠幆澧冿紝鍙互鐢ㄤ簬緙栬緫銆佺紪璇戙佽皟寮忋佽繍琛屻侀儴緗層佹墦鍖呫侀泦鎴愬叾浠栫粍浠訛紙鏁版嵁搴撶紪紼嬨佹湇鍔″櫒緇勪歡銆佹祻瑙堝櫒錛?br /> 浜屻丣DK銆丣RE銆丣VM鐨勫叧緋伙細錛堝寘鍚叧緋伙級 1.鍙互瀹夎JDK銆傚氨浠涔堥兘鏈変簡錛岃兘澶熸彁渚汮ava寮鍙戝姛鑳?br />2.鍙互鍙畨瑁匤RE錛屾鏃跺彧鑳藉榪愯Java紼嬪簭錛屼笉鑳芥彁渚涚紪璇戙佽皟寮忕瓑宸ュ叿 3.JVM涓嶈兘澶熷崟鐙畨瑁咃紝蹇呴』渚濋檮浜嶫RE瀛樺湪涓夈乄indows涓嬬殑鐜鍙橀噺閰嶇疆錛?br /> 1.Java 鐨勫畨瑁呯洰褰曪紝鎻愪緵緇欑涓夋柟杞歡浣跨敤 JAVA_HOME=C:\Program Files\Java\jdk1.6.0_10 2.Java鍛戒護鐨勬悳绱㈣礬寰勶紙浠庡墠寰鍚庝緷嬈℃壘瀵伙紝鎵懼埌涓烘錛?br /> PATH錛坧ath錛?%JAVA_HOME%\bin;%PATH%; 3.Java 綾誨緱鎼滅儲璺緞 鍦↗DK5.0浠ュ墠錛歝lasspath=.;C:\Program Files\Java\jdk1.6.0_10\lib\dt.jar;C:\Program Files\Java\jdk1.6.0_10\lib\tools.jar; 鍦↗DK5.0浠ュ悗錛歝lasspath=. 4.鏈鍚庣敤javac 鎴?nbsp; java -version楠岃瘉鍥涖乁nix/Linux涓嬬殑鐜鍙橀噺閰嶇疆錛?br /> 1.棣栧厛榪涘叆bash shell 2.鍦ㄤ富鐩綍涓嬩慨鏀?.bash_profile鏂囦歡錛岃嫢鏉冮檺涓嶅錛岃鐢╟hmod鍛戒護鏇存敼鏉冮檺 JAVA_HOME=/opt/jdk1.6.0_10 蹇呴』鏄ぇ鍐欙細PATH=$JAVA_HOME/bin:$PATH CLASSPATH=.: export JAVA_HOME PATH CLASSPATH 3.鏈鍚庝繚瀛橀鍑猴紝 騫剁敤source .bash_profile 璁╃幆澧冨彉閲忕敓鏁?br /> 鐢╡cho鎴杝et鍛戒護楠岃瘉鐜鍙橀噺鏄惁閰嶇疆瀹屾垚 鐢╦avac 鎴?java -version楠岃瘉 榪欐槸鎴戝湪涓ょ涓嶅悓緋葷粺涓嬮厤緗殑java鐜鍙橀噺錛屽笇鏈涜兘緇欎竴浜涙兂瀛︿範鐨勪漢甯︽潵甯姪錛?/font> ]]> java鐨勫嚑涓噸瑕佺壒鐐?/title> http://www.aygfsteel.com/zj474097500/archive/2011/07/14/354353.html銈繪櫤鍐涖儫 銈繪櫤鍐涖儫 Thu, 14 Jul 2011 15:37:00 GMT http://www.aygfsteel.com/zj474097500/archive/2011/07/14/354353.html http://www.aygfsteel.com/zj474097500/comments/354353.html http://www.aygfsteel.com/zj474097500/archive/2011/07/14/354353.html#Feedback 4 http://www.aygfsteel.com/zj474097500/comments/commentRss/354353.html http://www.aygfsteel.com/zj474097500/services/trackbacks/354353.html java鐨勫嚑涓壒鐐癸細 榪欐槸鎴戝java鐗圭偣鐨勪竴浜涚悊瑙e強鍏跺綊綰籌細 (1)銆乯ava 鐨勭畝鍗曟э細鍜孋++鐩告瘮錛岃娉曠畝鍗曚簡錛屽彇娑堜簡鎸囬拡鐨勮娉曪紱鍐呭瓨鍒嗛厤鍜屽洖鏀朵笉闇瑕佹垜浠潵榪囨浮鍏蟲敞錛孋++鍙互澶氱戶鎵匡紝浣唈ava鍙兘鏄崟緇ф壙錛岀浉瀵逛簬綾繪潵璇淬傦紙娉細鎺ュ彛鍙互澶氱戶鎵匡級 錛?錛夈乯ava闈㈠悜瀵硅薄錛歫ava綆楁槸綰潰鍚戝璞★紝浣唈query鏄洿綰殑闈㈠悜瀵硅薄銆?br /> 鍦╦ava緙栫▼鎬濇兂榪欐湰涔﹁榪囷紝“Everything is object!” 榪欐牱渚夸簬浜虹被鐨勬瀯鎬濆拰璁捐錛屾洿絎﹀悎浜轟滑鐨勬濊冮棶棰樻柟寮?br />錛?錛夈佸垎甯冨紡錛氫富瑕佽繕鏄敤鍦‥JB涓?br />錛?錛夈佸畨鍏ㄦэ細java鐨勮娉曢檺瀹氫簡婧愮▼搴忕殑瀹夊叏鎬э紝棣栧厛緙栬瘧鍣ㄤ細榪涜婧愪唬鐮佺殑絎竴姝ユ鏌?br />錛?錛夈佽法騫沖彴錛歫ava鑳藉璺ㄨ秺涓嶅悓鐨勬搷浣滅郴緇熷鉤鍙幫紝騫沖彴鏃犲叧鎬?br /> 鎬庝箞璺ㄥ鉤鍙板憿錛?nbsp; 涓昏鏄湪涓嶅悓鐨勬搷浣滅郴緇熶腑錛孞VM瑙勮寖閮芥槸涓鏍風殑錛岃JVM鍔犺澆鎴愬悇涓搷浣滅郴緇熸墍鏀寔鐨勶紝灞忚斀浜嗗簳灞傛搷浣滅郴緇熺殑宸紓 錛?錛夈侀珮鎬ц兘錛氬紑闂師鍒?--瀵規墿灞曞紑鏀撅紝瀵逛慨鏀瑰叧闂?nbsp; java鏄嵆鏃剁紪璇戠殑 錛?錛夈佸綰跨▼錛?br /> Java寮鍙戠殑嫻佺▼錛?br /> 錛?錛夈侀鍏堢紪杈?.java婧愮▼搴?br />錛?錛夈佺紪璇戞垚 .class瀛楄妭鐮佹枃浠禸yte code錛堜竴縐嶄簩榪涘埗鏂囦歡錛?br />錛?錛夈佹渶鍚庤java铏氭嫙鏈猴紙JVM錛夊姞杞借В閲婂茍鎵ц 铏界劧榪欎簺鏄緢鍩虹鐨勭煡璇嗭紝浣嗚繖浜涙槸鎴戝java閲嶆柊鐨勮璇嗭紝鍙兘榪樻槸鏈夊緢澶氬湴鏂逛笉鍒頒綅錛屼絾鎴戞洿鎯蟲妸搴曞眰鐨勭煡璇嗘墦鐗€?br />璇峰ぇ瀹朵竴璧鋒洿鎴戝垎浜紝鑻ユ湁濂界殑寤鴻錛岃鎻愬嚭錛佹垜鎯蟲洿榪涗竴姝ョ殑瀛︿範錛?br /> ]]>
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