JAVA»·¾³±äÁ¿µÄÅäÖÃ
JAVAµÄ³ÌÐò¿ª·¢£¬µÚÒ»²½ÊÇÕë¶ÔJAVA´î½¨ÆäÓ¦Óÿª·¢Æ½Ì¨¡£¹ØÓÚJDKµÄÏÂÔØÓë°²×°Ôڴ˲»¹ý¶à½éÉÜ£¬ÍøÉÏÏà¹ØÁ´½Ó½Ï¶à¡£Æ½Ì¨µÄ´î½¨Ò»¸ö»ù´¡²½ÖèÇҹؼü²½Öè¾ÍÊÇ£ºjava»·¾³±äÁ¿µÄÅäÖá£ÍøÉϹØÓÚJAVAµÄ»·¾³±äÁ¿ÉèÖ÷½·¨ºÜ¶à£¬Æð³õ½Ó´¥JAVA¿Ï¶¨ÓÐÐí¶à²»Ã÷°×µÄµØ·½£¬ÎÒÃÇÐèÒª°Ñ²½Ö辡Á¿µÄ¼ò»¯£¬±¾È˾õµÃ±È½ÏÓÐЧµÄ·½·¨ÈçÏ£º
Ò»¡¢windows ƽ̨ÏÂjava»·¾³±äÁ¿µÄÅäÖÃ
µã»÷ ÎҵĵçÄÔ -¡·ÊôÐÔ-¡·¸ß¼¶-¡·»·¾³±äÁ¿
È»ºó ÔÚ´ËÖ÷Òª±à¼Á½¸ö±äÁ¿classpath ºÍpath ¡£Í¨³£Çé¿öϱäÁ¿Ãû£ºclasspath²»´æÔÚ£¬ËùÒÔÎÒÃDZØÐëн¨Ò»¸öclasspath
½Ó×Å Ìîдclasspath ºÍpath µÄ±äÁ¿Öµ¡£
classpath µÄ±äÁ¿ÖµÎª£º .;C:\Program Files\Java\jdk1.6.0_14\lib\dt.jar;C:\Program Files\Java\jdk1.6.0_14\lib\tools.jar
path µÄ±äÁ¿ÖµÎª£º ;C:\Program Files\Java\jdk1.6.0_14\bin
ºÃ£¬ÉèÖÃÍê³ÉÒÔºóµã»÷ È·¶¨¡£
´Ëʱ£¬±äÁ¿ÅäÖÃÍê±Ï¡£
×¢Ò⣺ a ×¢Òâ: Ç°ÃæµÄ“.;”·ûºÅ£¬±ØÐëÌîд¡£
b ÄãÒª½« C:\Program Files\Java\jdk1.6.0_14 ¸ÄΪÄãµÄJAVA°²×°Ä¿Â¼¡£
¶þ¡¢linux ƽ̨ÏÂjava»·¾³±äÁ¿µÄÅäÖãº
Ê×ÏÈ °²×°JDKµ½Ä¿Â¼/usr/java/jdk1.6.0_14
È»ºó ÓÃvi±à¼Æ÷´ò¿ª“profile”Îļþ vi /etc/profile
½Ó×Å ÔÚºóÃæÌí¼ÓÒÔÏÂÄÚÈÝ£º
¡¡¡¡¡¡¡¡¡¡¡¡JAVA_HOME=/usr/java/jdk1.6.0_14 ¡¡¡¡¡¡¡¡¡¡
¡¡PATH=$JAVA_HOME/bin:$PATH
¡¡¡¡¡¡¡¡¡¡¡¡CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
¡¡¡¡¡¡¡¡¡¡¡¡export JAVA_HOME
¡¡¡¡¡¡¡¡¡¡¡¡export PATH
¡¡¡¡¡¡¡¡¡¡¡¡export CLASSPATH
×îºó ±£´æ²¢Í˳övi ±à¼Æ÷ ÖØÐµÇ¼£º½øÈëviµÄÃüÃûģʽ°´ wq£¡
Ïà¹ØÎĵµ£º
Java ¶àÏ̱߳à³ÌÖ®Èý£ºsynchronized ¹Ø¼ü×ÖµÄʹÓÃ
´øÓÐ synchronized ¹Ø¼ü×ֵķ½·¨´ú±íÕâ¸ö·½·¨¼ÓËø¡£Ç¡µ±¶øÓÖÁé»îµØÔËÓà synchronized ¹Ø¼ü×Ö£¬ÊǶàÏ̱߳à³ÌµÄ±ØÐ޿Ρ£
¡¡¡¡1¡¢synchronized¹Ø¼ü×ÖµÄ×÷ÓÃÓòÓжþÖÖ£º
¡¡¡¡1£©ÊÇij¸ö¶ÔÏóʵÀýÄÚ£¬synchronized aMethod(){}¿ÉÒÔ·ÀÖ¹¶à ......
@echo off cls REM --- BEG MACHINE-DEPENDENT ---- set HOME_J2RE=C:\Program Files\Java\jdk1.5.0_17 REM --- END MACHINE-DEPENDENT ---- set HOME_JAVA=%HOME_J2RE%\bin\java set HOME_JAVA="%HOME_JAVA%" set ARG_MEMORY=-Xms128m -Xmx196m set PROP_POLICY=-Dorg.ragingcat.kst.uikeytool.policy.extende ......
// ´´½¨Excel
String destFileName = tableName + ".xls";//ÎļþÃû
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment; filename=".concat(String .valueOf(destFileNa ......
¿Î³ÌÄÚÈÝ
¸ü¼ÓʵÓÿÆÑ§µÄJava»ù´¡¿Î³Ì
¾ßÓÐÔúʵµÄ±àÂ빦µ×ÊÇÒ»¸öJava¹¤³Ìʦ±Ø±¸µÄÄÜÁ¦£¬ÎÒÃÇÁ¦Çó´ÓѧԱ½Ó´¥JavaµÄµÚÒ»ÌìÆð¾ÍÅàÑøÆäÐγÉÕýȷ˼¿¼ÎÊÌâµÄ·½Ê½¡£ÎÒÃǵĹØ×¢µã²»½ö½öÔÚÓÚ¶Ôij¸öÀà¿â£¨API£©µÄÕÆÎÕ£¬¸ü¶àµÄÊÇÏòѧԱչʾÆóÒµÖÐÕæÕýÒªÖØÊÓµÄÎÊÌ⣬ÀýÈçÒì³£ÈçºÎ´¦Àí¡¢Ëã·¨ÈçºÎÓÅ»¯µÈ¡£Í¬Ê±£¬ÎÒÃÇ×¢ÖØÈÃÑ§Ô±Ñø³ÉÁ¼ºÃµ ......
¸´ÖÆÊý×éµÄ·½·¨£º
ÔÚJAVAÀïÃæ£¬¿ÉÒÔÓø´ÖÆÓï¾ä“A=B”¸ø»ù±¾ÀàÐ͵ÄÊý¾Ý´«µÝÖµ£¬µ«ÊÇÈç¹ûA,BÊÇÁ½¸öͬÀàÐ͵ÄÊý×飬¸´ÖƾÍÏ൱ÓÚ½«Ò»¸öÊý×é±äÁ¿µÄÒýÓô«µÝ¸øÁíÒ»¸öÊý×飻Èç¹ûÒ»¸öÊý×é·¢Éú¸Ä±ä£¬ÄÇôÒýÓÃͬһÊý×éµÄ±äÁ¿Ò²Òª·¢Éú¸Ä±ä¡£
ÒÔÏÂÊǹéÄɵÄJAVAÖи´ÖÆÊý×éÔªËØÖµµÄµÄ·½·¨£º£¨É±´£©
1¡£Ê¹ÓÃFORÑ»· ......