Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

Java 7ÐÂÌØÐÔ£¨Èý£© ——¸ü¶àNIO APIs

        JSR 203£ºNIO 2À©Õ¹ºÍʵÏÖÁËÔÚJava 1.4ÖмÓÈëµÄ×î³õNIO¹¦ÄÜ¡£ÔÚNIO 2ÖÐ×îÃ÷ÏÔµÄÐÂÔö¹¦ÄܾÍÊÇÎļþ·ÃÎÊAPIµÄÈ«Ãæ¸Ä½ø¡£¶àÊý¿ª·¢Õß¶¼Óùýjava.io.File£¬¶ÔÆä´æÔÚµÄÖÚ¶àȱÏÝ×ÔÈ»ÐÄÖÐÓÐÊý£º
        ¡ô²»Ö§³Ö·ûºÅÁ´½Ó(symbolic links )
        ¡ô²»Ö§³Ö¼òµ¥Òƶ¯ºÍ¿½±´²Ù×÷
        ¡ôĿ¼ÂþÓκ͹ýÂËAPI·Ç³£¸´ÔÓ
        ¡ô¶ÔÎļþÊôÐԺͷÃÎÊȨÏÞµÄÖ§³Ö·Ç³£ÓÐÏÞ
        ¡ôûÓв鿴Ŀ¼»òÎļþµÄAPI
       ¡ôÓÐÏ޵ĴíÎó´¦Àí¹¦ÄÜ
        ÐÒÔ˵ÄÊÇ£¬JSR 203²»½ö¸Ä½øÁËÒÔÉÏËùÓÐȱµã£¬¶øÇÒʵÏÖÁ˸ü¶à¹¦ÄÜ¡£Õâ¸öAPI´ÓÒ»¿ªÊ¼¾ÍÉè¼ÆÎª¾ß±¸¿ÉÀ©Õ¹ÐÔ£¬³ýÁËÖ§³ÖĬÈÏÎļþϵͳÍ⣬»¹Ö§³ÖǶÈëʽÎļþϵͳ£¬»¹¾ßÓÐÖî¶àÁé»îÑ¡ÏîÉèÖ㬿ÉÒÔʵÏÖÖîÈç´ò¿ªºÍ¿½±´Îļþ¡¢ÏµÍ³ÊôÐÔ¶¨ÒåµÈ²Ù×÷¡£
        Listing 2ÑÝʾÁËJSR 203ÊÇÈçºÎ±»ÓÃÀ´ÊµÏÖһЩͨÓòÙ×÷¡£PathÊÇÕâ¸öAPIµÄºËÐÄ;Äã¿ÉÒÔ°ÑËü¿´×÷н¨Îļþ¡£
        Listing 2
import java.nio.file.*;
// FileSystems -> FileSystem -> Path
FileSystem fileSystem = FileSystems.getDefault();
Path homeDir = fileSystem.getPath("/Users/lskywalker");
// Shortcut with Paths helper class
Path homeDir = Paths.get("/Users/lskywalker");
Path secrets = homeDir.resolve("secrets.txt");

// Steal secrets
secrets.moveTo(Paths.get("/Users/dvader/secrets.txt"));
        ³ýÁËÎļþϵͳAPIÍ⣬JSR 203»¹ÊµÏÖÁËÐí¶àÔÚµÚÒ»°æNIOÖÐÌá³öµÄAPI£¬ÌṩÁ˶Ô×é²¥µÄ¸ü¶àÖ§³Ö£¬ÌṩÁËÔÚSocketºÍÎļþÉϽøÐÐÒì²½I/O²Ù×÷µÄAPI¡£


Ïà¹ØÎĵµ£º

JAVA¼¯ºÏÀà


java.util°üÖоͰüº¬ÁËһϵÁÐÖØÒªµÄ¼¯ºÏÀ࣬¶ø¶ÔÓÚ¼¯ºÏÀ࣬Ö÷ÒªÐèÒªÕÆÎյľÍÊÇËüµÄÄÚ²¿½á¹¹£¬ÒÔ¼°±éÀú¼¯ºÏµÄµü´úģʽ¡£
½Ó¿Ú£ºCollection
ËùÓм¯ºÏÀàµÄ¸ùÀàÐÍ£¬Ö÷ÒªµÄÒ»¸ö½Ó¿Ú·½·¨£ºboolean add(Ojbect c)Ëä·µ»ØµÄÊÇboolean£¬µ«²»ÊDZíʾÌí¼Ó³É¹¦Óë·ñ£¬ÒòΪCollection¹æ¶¨£ºÒ»¸ö¼¯ºÏ¾Ü¾øÌí¼ÓÕâ¸öÔªËØ£¬ÎÞÂÛʲôԭÒò£¬¶¼± ......

javaÖÐɾ³ýÎļþÀÏʧ°ÜµÄ½â¾ö°ì·¨

¸Õ²ÅÔÚ×ö¸ö²âÊÔʱ  ɾ³ýÎļþÀÏÊÇʧ°Ü...Ò»Ö±ÕÒ²»µ½Ô­Òò.. file.delete();
×ÜÊÇ·µ»Øfalse.
ÔÚÍøÉÏÕÒÁ˰ëÌì  ¶¼ÕÒ²»µ½´íÔÚÄĶù..
if(file.exists() && file.canWrite())
file.delete();
ÕâÑù¶¼²»ÐС­
ºóÀ´Í»È»Í»È»Ïëµ½´íÔÚÄĶùÁË..
¾ÍÊÇÔÚдÍêÎļþºóûÓÐclose
out.write(b);
out.flush();
out.close(); ......

Java µÄ £ÀOverride ±ê¼ÇµÄ¼æÈÝÇé¿ö

ÔÚ Java 5 »·¾³ÖУ¬Èç¹ûÓÃÀàAȥʵÏÖ½Ó¿ÚB (A implements B)£¬ÔÚ Java 5 µÄƽ̨Ï£¬A ʵÏֵķ½·¨ÃûǰÊDz»ÄÜÌí¼Ó @Override ±ê¼ÇµÄ£¬·ñÔò»á±¨ÈçÏÂͼËùʾµÄ´íÎóÌáʾ¶øÎÞ·¨±àÒ룺
{{----}}16172
¾­¹ý³¢ÊÔºÍ×ܽᣬµÃ³öÏÂ±í¡£
Version
Java 5
Java 6
³¬ÀàÐÍÊÇ interface£¬×ÓÀàÐÍÖØÐ´µÄ·½·¨ÄÜ·ñÌí¼Ó@Override ±ê¼Ç
·ñ
ÊÇ
......

java clone

java clone
ÎÄÕ·ÖÀà:Java±à³Ì ¹Ø¼ü×Ö: java clone
1.javaÀïµÄclone·ÖΪ£º
A:dz¸´ÖÆ£¨Ç³¿Ë¡£©: dz¸´Öƽö½ö¸´ÖÆËù¿¼ÂǵĶÔÏ󣬶ø²»¸´ÖÆËüËùÒýÓõĶÔÏó¡£
b:Éî¸´ÖÆ£¨Éî¿Ë¡£©£ºÉî¸´ÖÆ°ÑÒª¸´ÖƵĶÔÏóËùÒýÓõĶÔÏ󶼸´ÖÆÁËÒ»±é¡£
JavaÖжÔÏóµÄ¿Ë¡,ΪÁË»ñÈ¡¶ÔÏóµÄÒ»·Ý¿½±´£¬ÎÒÃÇ¿ÉÒÔÀûÓÃObjectÀàµÄclone()·½·¨¡£±ØÐëÒª ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ