Java 7ÒѾÍê³ÉµÄÆß´óй¦ÄÜÔ¤ÀÀ
Java 7ÒѾÍê³ÉµÄ7´óй¦ÄÜ£º
1£©¶Ô¼¯ºÏÀàµÄÓïÑÔÖ§³Ö£»
2£©×Ô¶¯×ÊÔ´¹ÜÀí£»
3£©¸Ä½øµÄͨÓÃʵÀý´´½¨ÀàÐÍÍÆ¶Ï£»
4£©Êý×Ö×ÖÃæÁ¿Ï»®ÏßÖ§³Ö£»
5£©switchÖÐʹÓÃstring£»
6£©¶þ½øÖÆ×ÖÃæÁ¿£»
7£©¼ò»¯¿É±ä²ÎÊý·½·¨µ÷Óá£
ÏÂÃæÎÒÃÇÀ´×Ðϸ¿´Ò»ÏÂÕâ7´óй¦ÄÜ£º
¶Ô¼¯ºÏÀàµÄÓïÑÔÖ§³Ö
Java½«°üº¬¶Ô´´½¨¼¯ºÏÀàµÄµÚÒ»ÀàÓïÑÔÖ§³Ö¡£ÕâÒâζ׿¯ºÏÀàµÄ´´½¨¿ÉÒÔÏñRubyºÍPerlÄÇÑùÁË¡£
Ô±¾ÐèÒªÕâÑù£º
List<String> list = new ArrayList<String>();
list.add("item");
String item = list.get(0);
Set<String> set = new HashSet<String>();
set.add("item");
Map<String, Integer> map = new HashMap<String, Integer>();
map.put("key", 1);
int value = map.get("key");
ÏÖÔÚÄã¿ÉÒÔÕâÑù£º
List<String> list = ["item"];
String item = list[0];
Set<String> set = {"item"};
Map<String, Integer> map = {"key" : 1};
int value = map["key"];
ÕâЩ¼¯ºÏÊDz»¿É±äµÄ¡£
×Ô¶¯×ÊÔ´¹ÜÀí
JavaÖÐijЩ×ÊÔ´ÊÇÐèÒªÊÖ¶¯¹Ø±ÕµÄ£¬ÈçInputStream£¬Writes£¬Sockets£¬Sql classesµÈ¡£Õâ¸öеÄÓïÑÔÌØÐÔÔÊÐítryÓï¾ä±¾ÉíÉêÇë¸ü¶àµÄ×ÊÔ´£¬ÕâЩ×ÊÔ´×÷ÓÃÓÚtry´úÂë¿é£¬²¢×Ô¶¯¹Ø±Õ¡£
Õâ¸ö£º
BufferedReader br = new BufferedReader(new FileReader(path)); try { return br.readLine(); } finally { br.close(); }
±ä³ÉÁËÕâ¸ö£º
try (BufferedReader br = new BufferedReader(new FileReader(path)) { return br.readLine(); }
Äã¿ÉÒÔ¶¨Ò幨±Õ¶à¸ö×ÊÔ´£º
try ( InputStream in = new FileInputStream(src); OutputStream out = new FileOutp
Ïà¹ØÎĵµ£º
Java NIO APIÏê½â
ÔÚJDK
1.4ÒÔǰ£¬JavaµÄIO²Ù×÷¼¯ÖÐÔÚjava.ioÕâ¸ö°üÖУ¬ÊÇ»ùÓÚÁ÷µÄ×èÈû£¨blocking£©API¡£¶ÔÓÚ´ó¶àÊýÓ¦ÓÃÀ´Ëµ£¬ÕâÑùµÄAPIʹÓúܷ½
±ã£¬È»¶ø£¬Ò»Ð©¶ÔÐÔÄÜÒªÇó½Ï¸ßµÄÓ¦Óã¬ÓÈÆäÊÇ·þÎñ¶ËÓ¦Óã¬ÍùÍùÐèÒªÒ»¸ö¸üΪÓÐЧµÄ·½Ê½À´´¦ÀíIO¡£´ÓJDK 1.4Æð£¬NIO
API×÷Ϊһ¸ö»ùÓÚ»º³åÇø£¬²¢ÄÜÌṩ·Ç×èÈû(non-blo ......
±ÈÈçjavaÖг£ÓõÄÔËËã·û
Ò» ·ûºÅ++ ,+,--,-
ÓÐʱÕâ¸ö·ûºÅÆ´´ÕÆðÀ´Ò²Óе㸴ÔÓ
±ÈÈçÕâÑùÒ»¸öÔËËãʽ
int i=3;
i+++i-i++-++i
+ -ÔËËã·ûµÄÓÅÏȼ¶ µÍÓÚ++£¬-- ÏÈÔËËã++£¬--
¿ÉÒÔ½«ÉÏÃæµÄʽ×Ó²ð¿ª
i++ + i - i++ - ++i
ÕâÑùÊDz»ÊÇÈÝÒ×¶àÁË
ÏÈÀ´¸ö¼òµ¥µãµÄ
1 K++
int k=0;
System.out.println(K++)
System.o ......
ÏÂÃæ¿ª½²¹ÊÊ£º
´ÓǰÓиö·¿¼ä£¬·¿¼äÀïÓзÝÎĵµ£¬·¿¼ä»¹ÓÐÒ»°ÑÔ¿³×¡£ Õâ°ÑÔ¿³×ÔÚÕÅÈýÊÖÀï¡£
ÕâʱÀîËÄÀ´ÏòÕÅÈýÒªÄÇ·ÝÎĵµ¡£ ÕÅÈý²»Ì«Ï²»¶ÀîËÄ£¬µ«ÓÖŵ¢ÎóÁË
¹¤×÷²»ºÃ½»´ú¡£ÓÚÊÇÕÅÈý¾Í°Ñ·¿¼äÀïÎĵµµÄÎĵµ¸´Ó¡ÁËÒ»·Ý£¬È»ºó°ÑÄǸö¸´Ó¡¼þ½»¸øÁËÀîËÄ£¨Õâ½Ð´«Öµ£©¡£
ÀîËÄÄõ½Îĵµºó£¨¸´Ó¡¼þ£©£¬ºúÂÒÐÞ¸ÄÒ» ......
ÔÚÓ¦Óÿª·¢ÖУ¬¾³£ÐèҪһЩÖÜÆÚÐԵIJÙ×÷£¬±ÈÈçÿ5·ÖÖÓÖ´ÐÐijһ²Ù×÷µÈ¡£ÔÚWEBÏîÄ¿ÖпÉÄÜÐèҪÿ¸ôÒ»¶Îʱ¼ä×Ô¶¯Éú³É¾²Ì¬Ò³£¬×Ô¶¯¼ì²âÊÇ·ñÓÐÐÂÓʼþ£¬¶¨Ê±×Ô¶¯±¸·ÝÎļþµÈ²Ù×÷¡£ÕâЩ¶¼¿ÉÒÔͨ¹ý¶¨Ê±Æ÷TimerÀ´½â¾ö¡£
ÕâÀï½öÌṩ¶¨Ê±Æ÷µÄ²¿·Ö·½·¨ºÍ˵Ã÷£¬¾²Ì¬Ò³Éú³ÉµÈ²Ù×÷¶ÁÕß¿ÉÒÔͨ¹ýÏà¹Ø·½·¨×ÔÐнâ¾ö¡£
¡£¡£¡£°Ù¶È¿Õ¼äÌù´úÂë×ÜÊ ......