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
JavaÖÐͨ¹ýimplements SerializableÀ´ÊµÏÖ¶ÔÏóµÄÐòÁл¯¡£ÆäʵSerializable½Ó¿ÚÖв¢Ã»ÓÐÐèҪʵÏֵķ½·¨£¬×¢Ã÷ij¸öÀàimplements SerializableÖ»ÊÇΪÁ˱êʶ»ò±íÃ÷Õâ¸öÀà¿ÉÒÔ±»ÐòÁл¯¡£
ÄÇôʲôÊÇÐòÁл¯ÄØ£¬ÐòÁл¯ÓÖÓÐʲô×÷ÓÃÄØ£¿
Ò»¸öÀ࣬»ò ......
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´ ......
Ò»¡¢±ÜÃâÔÚÑ»·Ìõ¼þÖÐʹÓø´ÔÓ±í´ïʽ
ÔÚ²»×ö±àÒëÓÅ»¯µÄÇé¿öÏ£¬ÔÚÑ»·ÖУ¬Ñ»·Ìõ¼þ»á±»·´¸´¼ÆË㣬Èç¹û²»Ê¹Óø´ÔÓ±í´ïʽ£¬¶øÊ¹Ñ»·Ìõ¼þÖµ²»±äµÄ»°£¬³ÌÐò½«»áÔËÐеĸü¿ì¡£
Àý×Ó£º
import java.util.Vector;
class CEL {
void method (Vector vector) {
......