java»ñÈ¡µ±Ç°Â·¾¶
java»ñÈ¡µ±Ç°Â·¾¶
1¡¢ÀûÓÃSystem.getProperty()º¯Êý»ñÈ¡µ±Ç°Â·¾¶£º
System.out.println(System.getProperty("user.dir"));//user.dirÖ¸¶¨Á˵±Ç°µÄ·¾¶
2¡¢Ê¹ÓÃFileÌṩµÄº¯Êý»ñÈ¡µ±Ç°Â·¾¶£º
File directory = new File("");//É趨Ϊµ±Ç°Îļþ¼Ð
try{
System.out.println(directory.getCanonicalPath());//»ñÈ¡±ê×¼µÄ·¾¶
System.out.println(directory.getAbsolutePath());//»ñÈ¡¾ø¶Ô·¾¶
}catch(Exceptin e){}
File.getCanonicalPath()ºÍFile.getAbsolutePath()´óÔ¼Ö»ÊǶÔÓÚnew File(".")ºÍnew File("..")Á½ÖÖ·¾¶ÓÐËùÇø±ð¡£
# ¶ÔÓÚgetCanonicalPath()º¯Êý£¬“."¾Í±íʾµ±Ç°µÄÎļþ¼Ð£¬¶ø”..“Ôò±íʾµ±Ç°Îļþ¼ÐµÄÉÏÒ»¼¶Îļþ¼Ð
# ¶ÔÓÚgetAbsolutePath()º¯Êý£¬Ôò²»¹Ü”.”¡¢“..”£¬·µ»Øµ±Ç°µÄ·¾¶¼ÓÉÏÄãÔÚnew File()ʱÉ趨µÄ·¾¶
# ÖÁÓÚgetPath()º¯Êý£¬µÃµ½µÄÖ»ÊÇÄãÔÚnew File()ʱÉ趨µÄ·¾¶
±ÈÈ統ǰµÄ·¾¶Îª C:\test £º
File directory = new File("abc");
directory.getCanonicalPath(); //µÃµ½µÄÊÇC:\test\abc
directory.getAbsolutePath(); //µÃµ½µÄÊÇC:\test\abc
direcotry.getPath(); //µÃµ½µÄÊÇabc
File directory = new File(".");
directory.getCanonicalPath(); //µÃµ½µÄÊÇC:\test
directory.getAbsolutePath(); //µÃµ½µÄÊÇC:\test\.
direcotry.getPath(); //µÃµ½µÄÊÇ.
File directory = new File("..");
directory.getCanonicalPath(); //µÃµ½µÄÊÇC:\
directory.getAbsolutePath(); //µÃµ½µÄÊÇC:\test\..
direcotry.getPath(); //µÃµ½µÄÊÇ..
ÁíÍ⣺System.getProperty()ÖеÄ×Ö·û´®²ÎÊýÈçÏ£º
System.getProperty()²ÎÊý´óÈ«
# java.version Java Runtime Environment version
# java.vendor &nbs
Ïà¹ØÎĵµ£º
JAVA annotationÈëÃÅ
×î½ü¶ÔspringÔ´Âë¸ÐÐËȤ£¬½ñÌì¿´µ½annotation²¿·Ö£¬ÂÔ¼ÇÖ®¡£
Ò». ×î³£¼ûµÄannotation
@Override:ÓÃÔÚ·½·¨Ö®ÉÏ£¬ÓÃÀ´¸æËß±ðÈËÕâÒ»¸ö·½·¨ÊǸÄд¸¸ÀàµÄ
@Deprecated:½¨Òé±ðÈ˲»ÒªÊ¹ÓþɵÄAPIµÄʱºòÓõÄ,±àÒëµÄʱºò»áÓòúÉú¾¯¸æÐÅÏ¢,¿ÉÒÔÉ趨ÔÚ ......
ÔÚJavaÖУ¬“Ïָ߳̔Á½¼þ²»Í¬µÄÊÂÇ飺
1¡¢java.lang.ThreadÀàµÄÒ»¸öʵÀý£»
2¡¢Ï̵߳ÄÖ´ÐС£
ʹÓÃjava.lang.ThreadÀà»òÕßjava.lang.Runnable½Ó¿Ú±àд´úÂëÀ´¶¨Ò塢ʵÀý»¯ºÍÆô¶¯ÐÂÏ̡߳£
Ò»¸öThreadÀàʵÀýÖ»ÊÇÒ»¸ö¶ÔÏó£¬ÏñJavaÖеÄÈκÎÆäËû¶ÔÏóÒ»Ñù£¬¾ßÓбäÁ¿ºÍ·½·¨£¬ÉúËÀÓÚ¶ÑÉÏ¡£
JavaÖУ¬Ã¿¸öÏ̶߳¼ÓÐÒ»¸öµ÷ ......
ÔÚ»ñÈ¡Îı¾µÄʱºò£¬¾³£Óöµ½Êý¾Ý¸ñʽµÄÎÊÌ⣬ÐèÒªÅжϻòת»»¡£
±¾ÎÄÖ¼ÔÚ½â¾öÈ«½Ç·ûºÅת»»Îª°ë½Ç·ûºÅµÄÎÊÌâ¡£
ÍøÉÏ´óÌåÓÐÁ½ÖÖ·½·¨£º×ª»»±àÂë»òÔòÌæ»»¡£
ÎÒʹÓõÄÊÇת»»±àÂë
1. string checkStr="£±£²£³456";
2. //ÅжÏÊÇ·ñ°üº¬È«½Ç×Ö·û[1]
3. if(checkStr.length() != checkStr.getBytes().length) ......
ÒÔÏÂÊÇ Java ÅжÏ×Ö·û´®ÊÇ·ñΪ¿ÕµÄÈýÖÖ·½·¨.
·½·¨Ò»: ×î¶àÈËʹÓõÄÒ»¸ö·½·¨, Ö±¹Û, ·½±ã, µ«Ð§ÂʺܵÍ.
·½·¨¶þ: ±È½Ï×Ö·û´®³¤¶È, ЧÂʸß, ÊÇÎÒÖªµÀµÄ×îºÃÒ»¸ö·½·¨.
·½·¨Èý: Java SE 6.0 ²Å¿ªÊ¼ÌṩµÄ·½·¨, ЧÂʺͷ½·¨¶þ¼¸ºõÏàµÈ, µ«³öÓÚ¼æÈÝÐÔ¿¼ÂÇ, ÍƼöʹÓ÷½·¨¶þ.
ÒÔÏ´úÂëÔÚÎÒ»úÆ÷ÉϵÄÔËÐнá¹û: (»úÆ÷ÐÔÄܲ»Ò», ½ö¹ ......