javaÖеÄSystem.currentTimeMillis()º¯Êý
System.currentTimeMillis()£º¿ÉÒÔÌáÈ¡µ½µ±Ç°Ê±¼äµÄºÁÃëÊý£¬²úÉúÒ»¸öµ±Ç°µÄºÁÃ룬Õâ¸öºÁÃëÆäʵ¾ÍÊÇ×Ô1970Äê1ÔÂ1ÈÕ0ʱÆðµÄºÁÃëÊý¡£
³£¼û×÷ÓãºÒ»°ã¶¼ÊÇÓÃ2¸öʱ¼äµÄ²îÖµÀ´µÃµ½ÔËÐÐʱ¼äµÄ£¬³£ÓÃÀ´±È½Ï2¸öËã·¨µÄЧÂÊ£¡
long start = System.currentTimeMillis();
// ÕâÀï¿ÉÒÔ¼ÓÉÏÄãÒªÖªµÀµÄ·½·¨ÔËÐеÄʱ¼ä£¡£¡
long end = System.currentTimeMillis();
System.out.println("ÔËÐÐʱ¼ä£º"+(end - start));
¸ñʽ»¯System.currentTimeMillis()
1 import java.text.SimpleDateFormat;
2 import java.util.Locale;
3
4
5 public class FormatCurrentTime {
6 /**
7 * @param args
8 */
9 public static void main(String[] args) {
10
11 SimpleDateFormat sdf = new SimpleDateFormat("", Locale.SIMPLIFIED_CHINESE);
12 sdf.applyPattern("yyyyÄêMMÔÂddÈÕ HHʱmm·ÖssÃë");
13 System.out.println(sdf.format(System.currentTimeMillis()));
14
15 }
16 }
17
Ïà¹ØÎĵµ£º
javaÀàµÄ³ÉÔ±±äÁ¿ÓÐÁ©ÖÖ£º
Ò»ÖÖÊDZ»static¹Ø¼ü×ÖÐÞÊεıäÁ¿£¬½ÐÀà±äÁ¿»òÕß¾²Ì¬±äÁ¿
ÁíÒ»ÖÖûÓÐstaticÐÞÊΣ¬ÎªÊµÀý±äÁ¿ ÀàµÄ¾²Ì¬±äÁ¿ÔÚÄÚ´æÖÐÖ»ÓÐÒ»¸ö£¬javaÐéÄâ»úÔÚ¼ÓÔØÀàµÄ¹ý³ÌÖÐΪ¾²Ì¬±äÁ¿·ÖÅäÄڴ棬¾²Ì¬±äÁ¿Î»ÓÚ·½·¨Çø£¬±»ÀàµÄËùÓÐʵÀý¹²Ïí¡£ ¾²Ì¬±äÁ¿¿ÉÒÔÖ±½Óͨ¹ýÀàÃû½øÐзÃÎÊ£¬ÆäÉúÃüÖÜÆÚÈ¡¾öÓÚÀàµÄÉú ......
1¡¢ÀàµÄÐÞÊηû·ÖΪ£º¿É·ÃÎÊ¿ØÖÆ·ûºÍ·Ç·ÃÎÊ¿ØÖÆ·ûÁ½ÖÖ¡£
¿É·ÃÎÊ¿ØÖÆ·ûÊÇ£º¹«¹²ÀàÐÞÊηû public
·Ç·ÃÎÊ¿ØÖÆ·ûÓУº³éÏóÀàÐÞÊηû abstract £»×îÖÕÀàÐÞÊηû final
1 £©¹«¹²ÀàÐÞÊηû public £º Java ÓïÑÔÖÐÀàµÄ¿É·ÃÎÊ¿ØÖÆ·ûÖ»ÓÐÒ»¸ö£º public ¼´¹«¹²µÄ¡£Ã¿¸ö Java ³ÌÐòµÄÖ÷Àà¶¼±ØÐëÊÇ public Àà×÷Ϊ¹«¹²¹¤¾ß¹©ÆäËüÀàºÍ³ÌÐòÊ¹Ó ......
×î½üÒªÔÚÒ»¸öJAVA¹¤³ÌÖе÷ÓÃÒ»¸ö±ðÈ˵ÄDLL¿â£¬³öÏÖÁËÒÔÏÂÎÊÌ⣺ƽ̨ÊÇJDK1.6.0_2
±ðÈ˵ÄDLLµ¼³öµÄº¯ÊýÀàËÆÓÚ_Java_Sth_1Find@12 £¬¶øÎÒ·ÃÎʸú¯ÊýµÄÀàÈç¹ûÔÚdefault packageϾͿÉÒÔÕý³£·ÃÎÊ£¬¾ÍÊÇ˵DLLµ¼³öµÄJNIÊÇÔÚĬÈϰüÏµģ¬¶øÈç¹û°Ñ¸ÃÀà·ÅÈëÌØ¶¨µÄ°üϾͻá³öÏÖException in thread "main" java.lang.UnsatisfiedLink ......
JavaµÄÄÚ´æÄ£ÐÍJMM£¨Java Memory Model£©JMMÖ÷ÒªÊÇΪÁ˹涨ÁËÏ̺߳ÍÄÚ´æÖ®¼äµÄһЩ¹ØÏµ¡£¸ù¾ÝJMMµÄÉè¼Æ£¬ÏµÍ³´æÔÚÒ»¸öÖ÷ÄÚ´æ(Main Memory)£¬JavaÖÐËùÓÐʵÀý±äÁ¿¶¼´¢´æÔÚÖ÷´æÖУ¬¶ÔÓÚËùÓÐÏ̶߳¼Êǹ²ÏíµÄ¡£Ã¿ÌõÏ̶߳¼ÓÐ×Ô¼ºµÄ¹¤×÷ÄÚ´æ(Working Memory)£¬¹¤×÷ÄÚ´æÓÉ»º´æºÍ¶ÑÕ»Á½²¿·Ö×é³É£¬»º´æÖб£´æµÄÊÇÖ÷´æÖбäÁ¿µÄ¿½±´£¬»º´ ......
·´Éä»úÖÆ:ËùνµÄ·´Éä»úÖÆ¾ÍÊÇjavaÓïÑÔÔÚÔËÐÐʱӵÓÐÒ»Ïî×Ô¹ÛµÄÄÜÁ¦¡£Í¨¹ýÕâÖÖÄÜÁ¦¿ÉÒÔ³¹µ×µÄÁ˽â×ÔÉíµÄÇé¿öΪÏÂÒ»²½µÄ¶¯×÷×ö×¼±¸¡£ÏÂÃæ¾ßÌå½éÉÜÒ»ÏÂjava
µÄ·´Éä»úÖÆ¡£ÕâÀïÄ㽫µß¸²ÔÀ´¶ÔjavaµÄÀí½â¡£
JavaµÄ·´Éä»úÖÆµÄʵÏÖÒª½èÖúÓÚ4¸öÀࣺclass£¬Constructor£¬F ......