JavaÖØÐ´ÓëÖØÔØ
ÖØÐ´µÄÖ÷ÒªÓŵãÊÇÄܹ»¶¨Òåij¸ö×ÓÀàÌØÓеÄÌØÕ÷:
Èç:
public class Father
{
public void speak()
{
System.out.println("Father");
}
}
public class Son extends Father
{
public void speak()
{
System.out.println("son");
}
}
ÕâÒ²½Ð×ö¶à̬ÐÔ,ÖØÐ´·½·¨Ö»ÄÜ´æÔÚÓÚ¾ßÓм̳йØÏµÖÐ,ÖØÐ´·½·¨Ö»ÄÜÖØÐ´¸¸Àà·Ç˽Óеķ½·¨,
µ±ÉÏÀýÖÐ FatherÀà speak()·½·¨±»privateʱ,SonÀ಻ÄÜÖØÐ´ FatherÀà speak()·½·¨,´ËʱSonÀà speak()·½·¨Ï൱ÓëÔÚSonÀàÖж¨ÒåµÄÒ»¸öspeak()·½·¨.
FatherÀà speak()·½·¨Ò»µ«±»finalʱ,ÎÞÂ۸÷½·¨±»public,protected¼°Ä¬ÈÏËùÐÞÊÎʱ,SonÀà¸ù±¾²»ÄÜÖØÐ´ FatherÀà speak()·½·¨,ÊÔͼ±àÒë´úÂëʱ,±àÒëÆ÷»á±¨´í.Àý:
public class Father
{
fianl public void speak()
{
System.out.println("Father");
&
Ïà¹ØÎĵµ£º
1.Áоٳö 10¸öJAVAÓïÑÔµÄÓÅÊÆ
a:Ãâ·Ñ£¬¿ªÔ´£¬¿çƽ̨(ƽ̨¶ÀÁ¢ÐÔ)£¬¼òµ¥Ò×Ó㬹¦ÄÜÍêÉÆ£¬ÃæÏò¶ÔÏ󣬽¡×³ÐÔ£¬¶àỊ̈߳¬½á¹¹ÖÐÁ¢£¬ÆóÒµÓ¦ÓõijÉÊìÆ½Ì¨, ÎÞÏßÓ¦ÓÃ
2.ÁоٳöJAVAÖÐ10¸öÃæÏò¶ÔÏó±à³ÌµÄÊõÓï
a:°ü£¬À࣬½Ó¿Ú£¬¶ÔÏó£¬ÊôÐÔ£¬·½·¨£¬¹¹ÔìÆ÷£¬¼Ì³Ð£¬·â×°£¬¶à̬£¬³éÏ󣬷¶ÐÍ
3.ÁоٳöJAVAÖÐ6¸ö±È½Ï³£Óõİü
Java. ......
×î½ü¿´µ½Ò»¸öÓÐÒâ˼µÄÊ÷Ðνṹ£¬ÎªÃ¿¸ö½ÚµãÌí¼ÓÁËlft
ºÍ
rgt
Á½¸öÊôÐÔ¡£ÕâÑù²éÕҸýڵãµÄ×ӽڵ㡢
²éÕҸýڵãËùÓи¸½Úµã£¬¾Í²»ÓÃÈ¥µÝ¹é²éѯ£¬Ö»ÐèÒªÓÃ
between
¡¢
and
Óï¾ä¾Í¿ÉÒÔʵÏÖ¡£ÏÂÃæÒÔ´´½¨Ò»¸öÀ¸Ä¿Ê÷ΪÀý£¬ÒÔÏÂÊÇÎÒµÄÀí½â¡£
¡¡¡¡Ò»°ãÀ´½²£¬ÎÒÃÇ´´½¨À¸Ä¿Ê÷µÄʱºò£¬´ó¶àÖ»ÐèÒªÒ»¸öÍâ¼üparentid
À´Çø·Ö¸Ã½Úµã ......
JavaµÄ×Ö·ûÀàÐͲÉÓõÄÊÇUTF-16±àÂ뷽ʽ¶ÔUnicode±àÂë±í½øÐбíʾ¡£ÆäÖÐÒ»¸öcharÀàÐ͹̶¨2Bytes£¨16bits£©¡£Ê×ÏÈÏȽéÉÜÒ»ÏÂUnicode±àÂë±íºÍUTF-16±àÂëËã·¨£º
Unicode±àÂë±íµÄרҵÊõÓ
´úÂëµã (code point): Ö¸ÔÚUnicode±àÂë±íÖÐÒ»¸ö×Ö·ûËù¶ÔÓ ......
JavaÁìÓòµÄ¼´Ê±Í¨ÐŵĽâ¾ö·½°¸¿ÉÒÔ¿¼ÂÇopenfire+spark+smack¡£µ±È»Ò²ÓÐÆäËûµÄÑ¡Ôñ¡£
¡¡¡¡OpenfireÊÇ»ùÓÚJabberÐÒé(XMPP)ʵÏֵļ´Ê±Í¨ÐÅ·þÎñÆ÷¶Ë°æ±¾£¬Ä¿Ç°½¨ÒéʹÓÃ3.6.4°æ±¾£¬Õâ¸ö°æ±¾Êǵ±Ç°×îеİ汾£¬¶øÇÒÍøÉÏ¿ÉÒÔÕÒµ½ÏÂÔØµÄÔ´´úÂë¡£
¡¡¡¡¼´Ê±Í¨Ðſͻ§¶Ë¿ÉʹÓÃspark2.5.8,Õâ¸ö°æ±¾ÊÇĿǰ×îеÄrelease°æ±¾£¬¾¹ý²âÊÔ· ......