ubuntuÏÂjava°²×°
´ò¿ªÖÕ¶Ë£¬Ö´ÐÐÒÔÏÂÃüÁ»òʹÓÃAdept/ÐÂÁ¢µÃÈí¼þ¹ÜÀíÆ÷£¬ÔÚÆäÖÐËÑË÷"sun-java6-jdk"²¢±ê¼Ç°²×°¡£
sudo apt-get install sun-java6-jdk
Ìáʾ£º°²×°¹ý³ÌÖÐÐèÒªÄã»Ø´ðÊÇ·ñͬÒâʹÓÃÐÒ飨ÖÕ¶ËÖкìÀ¶É«µÄÌáʾ½çÃæ£©£¬´Ëʱ°´tab¼üÖÁOK£¬ÔÙ°´»Ø³µ¼´¿ÉÕý³£°²×°¡£
* ÉèÖõ±Ç°Ä¬ÈϵÄjava½âÊÍÆ÷ºÍ±àÒëÆ÷£º (ubuntu9.10Èç¹ûûÓа²×°¶à¸öjavaÐéÄâ»úµÄ»°¿ÉÒÔÌø¹ýÕâÒ»²½¡£)
sudo update-alternatives --config java
Ö´Ðкó»á³öÏÖÀàËÆÈçÏÂµÄ»Ãæ:
There are 2 alternatives which provide `java'.
Selection Alternative
-----------------------------------------------
# /usr/bin/gij-wrapper-4.1
*+ 2 /usr/lib/jvm/java-6-sun/jre/bin/java
Press enter to keep the default[*], or type selection number:
ÊäÈë Óаüº¬ "sun" µÄÐеÄÇ°ÃæµÄÊý×Ö¡£ÈçÉÏÃæÏÔʾ£¬ÔòÊäÈë2£¬È»ºó»Ø³µÈ·¶¨¡£
sudo update-alternatives --config javac
²Ù×÷ºÍÇ°ÃæÀàËÆ¡£
* ÅäÖÃJAVA»·¾³±äÁ¿:
sudo gedit /etc/environment
ÔÚÆäÖÐÌí¼ÓÈçÏÂÁ½ÐУº
JAVA_HOME=/usr/lib/jvm/java-6-sun
CLASSPATH=.:/usr/lib/jvm/java-6-sun/lib
ҪʹÅäÖÃÉúЧ±ØÐëÖØÆô»úÆ÷»òÕßÔÚÃüÁîÐÐÊäÈë
. /etc/environment
* ÅäÖÃJVMµÄÓÅÏȼ¶: (ubuntu9.10Èç¹ûûÓа²×°¶à¸öjavaÐéÄâ»úµÄ»°¿ÉÒÔÌø¹ýÕâÒ»²½¡£)
sudo gedit /etc/jvm
½«ÎļþÖеÄ
/usr/lib/jvm/java-6-sun
ÕâÒ»ÐÐÌîÈëµ½ÅäÖÿéµÄ¶¥²¿
* °²×°ä¯ÀÀÆ÷µÄJAVA Plugin£¨ÍƼö°²×°£©£º
sudo apt-get install sun-java6-plugin
* ÖÐÎÄ×ÖÌåÉèÖãºÈç¹ûʹÓÃÎͦ×ÖÌåÓ¦¸Ã¿ÉÒÔ×àЧ£¬µ«ÊÇ»òÐí³öÏÖ¿Õ¸ñ£¬ÄÇô¿ÉÒÔ±à¼
/usr/lib/jvm/java-6-sun/jre/lib/fonts/fonts.dir
Ïà¹ØÎĵµ£º
JAVAÖÐÓÃÓÚ´¦Àí×Ö·û´®³£ÓõÄÓÐÈý¸öÀࣺjava.lang.String¡¢java.lang.StringBuffer¡¢java.lang.StringBuilder£¬ÕâÈýÕߵĹ²Í¬Ö®´¦¶¼ÊÇfinalÀ࣬²»ÔÊÐí±»¼Ì³Ð£¬ÕâÖ÷ÒªÊÇ´ÓÐÔÄܺͰ²È«ÐÔÉÏ¿¼Âǵģ¬ÒòΪÕ⼸¸öÀà¶¼ÊǾ³£±»Ê¹ÓÃ×ŵģ¬ÇÒ¿¼Âǵ½·ÀÖ¹ÆäÖеIJÎÊý±»ÐÞ¸ÄÓ°Ïìµ½ÆäËüµÄÓ¦Óá£StringBufferÓëStringBuilderÁ½¸ö»ù±¾Éϲ¶à£ ......
ÔÚÂÛ̳Àï¿´µ½ºÃ¶àÈËÎÊ×Ô¼ºµÄ Êý¾Ý¿â ΪʲôÁ¬½Ó²»ÉϵÄÀàËÆµÄÎÊÌâ
ÎÒ´ðÁ˺öà Ö÷ÒªµÄ´íÎóÔÒòÊÇ £º µ¼Èë Çý¶¯³ÌÐòµÄjarÎļþºó û±àÒë ¾ÍÔËÐÐ
Ï£Íû¸ÕѧJavaÊý¾Ý¿âµÄͬѧעÒâÁË£¡ ......
ÔÚJavaÖÐʹÓÃÊýÖµ½øÐжþÔª²Ù×÷ʱ£¬ÏÈÒª½«Á½¸ö²Ù×÷Êýת»»ÎªÍ¬Ò»ÖÖÀàÐÍ£¬×Ô¶¯×ª»»ÔÔòÈçÏ£º
Èç¹ûÁ½¸ö²Ù×÷ÊýÖÐÓÐÒ»¸öÊÇdoubleÀàÐ͵ģ¬ÄÇôÁíÒ»¸ö²Ù×÷Êý½«»áת»»ÎªdoubleÀàÐÍ£»
·ñÔò£¬Èç¹ûÆäÖÐÒ»¸ö²Ù×÷ÊýÊÇfloatÀàÐÍ£¬ÄÇôÁíÒ»¸ö²Ù×÷Êý½«»áת»»ÎªfloatÀàÐÍ£»
·ñÔò£¬Èç¹ûÆÚÖÐÒ»¸ö²Ù×÷ÊýÊÇlongÀàÐÍ£¬ÄÇôÁíÒ»¸ö²Ù×÷Êý½«»áת»» ......
JavaÏß³Ìͬ²½»úÖÆsynchronized¹Ø¼ü×ÖµÄÀí½â
¹Ø¼ü×Ö: Ïß³Ì synchronized
ÎÄÕ³ö´¦£ºhttp://tech.it168.com/j/2008-01-30/200801302324557.shtml
×÷ÕߣºÀ´×ÔITPUBÂÛ̳
Ïß³Ìͬ²½£º
¡¡¡¡ÓÉÓÚͬһ½ø³ÌµÄ¶à¸öÏ̹߳²ÏíͬһƬ´æ´¢¿Õ¼ä£¬ÔÚ´øÀ´·½±ãµÄͬʱ£¬Ò²´øÀ´ÁË·ÃÎʳåÍ»Õâ¸öÑÏÖØµÄÎÊÌâ¡£JavaÓïÑÔÌṩÁË ......
ÎÒÃÇÖªµÀ£¬Vector ÀàÌṩÁËʵÏÖ¿ÉÔö³¤Êý×éµÄ¹¦ÄÜ£¬Ëæ×Ÿü¶àÔªËØ¼ÓÈëÆäÖУ¬Êý×é±äµÄ¸ü´ó¡£ÔÚɾ³ýÒ»Ð©ÔªËØÖ®ºó£¬Êý×é±äС¡£
Vector ÓÐÈý¸ö¹¹Ô캯Êý£¬
public Vector(int initialCapacity,int capacityIncrement)
public Vector(int initialCapacity)
public Vector()
......