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

java SystemµÄÊôÐÔ²ÎÊý´óÈ«

Properties props=System.getProperties(); //ϵͳÊôÐÔ  
   System.out.println("JavaµÄÔËÐл·¾³°æ±¾£º"+props.getProperty("java.version"));  
   System.out.println("JavaµÄÔËÐл·¾³¹©Ó¦ÉÌ£º"+props.getProperty("java.vendor"));  
   System.out.println("Java¹©Ó¦É̵ÄURL£º"+props.getProperty("java.vendor.url"));  
   System.out.println("JavaµÄ°²×°Â·¾¶£º"+props.getProperty("java.home"));  
   System.out.println("JavaµÄÐéÄâ»ú¹æ·¶°æ±¾£º"+props.getProperty("java.vm.specification.version"));  
   System.out.println("JavaµÄÐéÄâ»ú¹æ·¶¹©Ó¦ÉÌ£º"+props.getProperty("java.vm.specification.vendor"));  
   System.out.println("JavaµÄÐéÄâ»ú¹æ·¶Ãû³Æ£º"+props.getProperty("java.vm.specification.name"));  
   System.out.println("JavaµÄÐéÄâ»úʵÏÖ°æ±¾£º"+props.getProperty("java.vm.version"));  
   System.out.println("JavaµÄÐéÄâ»úʵÏÖ¹©Ó¦ÉÌ£º"+props.getProperty("java.vm.vendor"));  
   System.out.println("JavaµÄÐéÄâ»úʵÏÖÃû³Æ£º"+props.getProperty("java.vm.name"));  
   System.out.println("JavaÔËÐÐʱ»·¾³¹æ·¶°æ±¾£º"+props.getProperty("java.specification.version"));  
   System.out.println("JavaÔËÐÐʱ»·¾³¹æ·¶¹©Ó¦ÉÌ£º"+props.getProperty("java.specification.vender"));  
   System.out.println("JavaÔËÐÐʱ»·¾³¹æ·¶Ãû³Æ£º"+props.getProperty("java.specification.name"));  
   System.out.println("JavaµÄÀà¸ñʽ°æ±¾ºÅ£º"+props.getProperty("java.class.version"));  
   System.out.println("JavaµÄÀà·¾¶£º"+props.getProperty("java.class.path"));  
   System.out.println("¼ÓÔØ¿âʱËÑË÷µÄ·¾¶ÁÐ±í£º"+props.getProperty("java.library.path"));  
   System.out.println("ĬÈϵÄÁÙʱÎļþ·¾¶£º"+props.getProperty("java.io.tmpdir"));  
   System.o


Ïà¹ØÎĵµ£º

JAVAµÄ²ÎÊý´«µÝ»úÖÆ

²ÎÊý´«µÝ»úÖÆÖ÷ÒªÓÐÁ½ÖÖ£ºÖµµ÷ÓÃ(call-by-value)£¬ÒýÓõ÷ÓÃ(call-by-reference)¡£
Öµµ÷ÓÃ(call-by-value)£º»á¶ÔʵÔÚ²ÎÊýÇóÖµ£¨Èç¹ûÊDZí´ïʽ£©»ò¿½±´£¨Èç¹ûÊDZäÁ¿£©¡£ÕâЩֵ±»·ÅÔÚÊôÓÚ±»µ÷Óùý³ÌµÄÏìÓ¦ÐÎʽ²ÎÊýµÄÄÚ´æÎ»ÖÃÉÏ¡£
ÒýÓõ÷ÓÃ(call-by-reference)£ºÊµÔÚ²ÎÊýµÄµØÖ·×÷ΪÏàÓ¦µÄÐÎʽ²ÎÊýµÄÖµ±»´«µÝ¸ø±»µ÷ÓÃÕß¡£ÔÚ±»µ÷ ......

javaÐéÄâ»ú·½Ãæ

Ò»¡¢Àà×°ÔØÆ÷£ºÍ¨¹ý·Ö±ðʹÓò»Í¬µÄÀà×°ÔØÆ÷×°ÔØ¿É¿¿µÄ°üºÍ²»¿É¿¿µÄ°üÀ´ÊµÏÖ°² È«ÐÔ¡£
 
ÔÚ1.2°æ±¾µÄJavaÐéÄâ»ú¿ªÊ¼ÔËÐÐʱ£¬ÔÚÓ¦ÓóÌÐòÆô¶¯ÒÔǰ£¬ËüÖÁÉÙ´´½¨Ò»¸öÓû§×Ô¶¨ÒåÀà×°ÔØÆ÷£¬Ò²¿ÉÄÜÊǶà¸ö¡£ËùÓÐÕâЩÀà×°ÔØÆ÷±»Á¬½ÓÔÚÒ»¸öË«Ç×--º¢×ӵĹØÏµÁ´ÖУ¬ÔÚÕâÌõÁ´µÄ¶¥¶ËÊÇÆô¶¯Àà×°ÔØÆ÷£¬Ä©¶ËÊÇÒ»¸ö±»³ÆÎª“ϵͳÀà× ......

JAVA²ÎÊý´«µÝÖµ´«µÝµÄÀí½â¡£

Ê×ÏÈÃ÷ȷһϣºjavaÀïÃæÖ»ÓÐÖµ´«µÝ£¬ÒýÓô«µÝÖ»ÊÇÒ»Ö»Îó¶Á¶øÒÑ¡£
À´¿´Ò»¸öÀý×Ó£º
public static void main(String[] args)
{
StringBuffer str1 = new StringBuffer("hello");
test(str1);
System.out.println("main : " + str1);
}
public static void test(StringBuffer s ......

11.Java»ù´¡ÖªÊ¶¡¾Ï¡¿

 (×îÖÕ»¹ÊǾö¶¨ÖØÐÂдһ·ÝJava»ù´¡Ïà¹ØµÄÄÚÈÝ£¬Ô­À´ÒòΪÔÚдÕâÒ»¸öÕ½ڵÄʱºòûÓп¼Âǵ½»á¼á³ÖÍùºó±ßд£¬Õâ´ÎÓ¦¸ÃÊǸüиÃÄÚÈÝ¡£¶øÇÒºÜÌÖÑáд»ù´¡µÄ¶«Î÷£¬ÄÚÈݱȽÏËöË飬¶øÇÒÕûÀíÆðÀ´×Ü»áºÜ¶à£¬ÓпÉÄÜ»á´òÉ¢³ÉÁ½¸öÕ½ڣ¬µ«ÊÇÎÒ²»±£Ö¤£¬ÓпÉÄÜÒ»¸öÕ½ھÍдÍêÁË£¬ËùÒÔÓÐʱºòÏ£Íû»ù´¡µÄºÜ¶àÄÚÈÝ»¹ÊǶÁÕß×Ô¼ºÈ¥¿´¿´£¬ÎÒ»ù± ......

JavaÕ»Óë¶ÑµÄ˼¿¼£¨×ªÔØ£©

1. Õ»(stack)Óë¶Ñ(heap)¶¼ÊÇJavaÓÃÀ´ÔÚRamÖдæ·ÅÊý¾ÝµÄµØ·½¡£ÓëC++²»Í¬£¬Java×Ô¶¯¹ÜÀíÕ»ºÍ¶Ñ£¬³ÌÐòÔ±²»ÄÜÖ±½ÓµØÉèÖÃÕ»»ò¶Ñ¡£ 2. Õ»µÄÓÅÊÆÊÇ£¬´æÈ¡ËٶȱȶÑÒª¿ì£¬½ö´ÎÓÚÖ±½ÓλÓÚCPUÖеļĴæÆ÷¡£µ«È±µãÊÇ£¬´æÔÚÕ»ÖеÄÊý¾Ý´óСÓëÉú´æÆÚ±ØÐëÊÇÈ·¶¨µÄ£¬È±·¦Áé»îÐÔ¡£ÁíÍ⣬ջÊý¾Ý¿ÉÒÔ¹²Ïí£¬Ïê¼ûµÚ3µã¡£¶ÑµÄÓÅÊÆÊÇ¿ÉÒÔ¶¯Ì¬µØ·ÖÅäÄÚ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ