Ò׽ؽØͼÈí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

ÓÃjava ´òÓ¡ÁâÐÎ

public class testthree {
 public static void main(String[] args) {
  testthree t = new testthree();
  t.test();
 }
 private static void test() {
  int d = 0;
  int f = 4;
  int x = 0;
  int y = 6;
  for (int j = 0; j < 4; j++) {
   f = f - 1;
   for (int i = 0; i < f; i++) {
    System.out.print(" ");
   }
   d = d + 2;
   for (int i = 1; i < d; i++) {
    System.out.print("*");
   }
   System.out.println();
  }
  for (int j = 0; j < 4; j++) {
   x = x + 1;
   for (int i = 0; i < x; i++) {
    System.out.print(" ");
   }
   y = y - 2;
   for (int i = 0; i <= y; i++) {
    System.out.print("*");
   }
   System.out.println();
  }
 }
}


Ïà¹ØÎĵµ£º

ÉîÈë½âÎöJavaµÄÐÂÌØÐÔassertion

 
ÎÒÃǾ­³£ÏÂÔØ¿ªÔ´ÏîÄ¿µÄÔ´ÂëÔÚ±¾µØ±àÒë,ÊDz»ÊǾ­³£±»Ò»¾ä"assert expression"¸ø¸ãµÃ±àÒë²»¹ýÈ¥£¬¾­³£ÊÇÔÚÀÏ°æ±¾µÄjdk±àÒëÆ÷ÏÂû°ì·¨£¬ÏÂÃæ¾ÍÏò´ó¼ÒÍƼöһƪÉîÈë·ÖÎöjava assertionµÄÎÄÕ¡£
Ò»¡¢assertionµÄÓï·¨ºÍÓïÒå
J2SE 1.4ÔÚÓïÑÔÉÏÌṩÁËÒ»¸öÐÂÌØÐÔ£¬¾ÍÊÇassertion(¶ÏÑÔ)¹¦ÄÜ£¬ËüÊǸð汾ÔÚJavaÓïÑÔ·½Ãæ×î´ ......

¼ÓÔØ¡¢Á´½ÓºÍ³õʼ»¯£¨java¸ß¼¶±à³Ì1.2.5£©


JVM£º¼ÓÔØ¡¢Á´½ÓºÍ³õʼ»¯
JVMÒª½âÊÍJava×Ö½ÚÂ룬¾Í±ØÐë¶ÔËùÐèµÄÀàºÍ½Ó¿ÚÖ´ÐÐÈçÏÂ3²½²Ù×÷£º
(1) ¼ÓÔØ£ºJVMÔÚ¼ÓÔØÀàʱ£¬»á²éÕÒ¸ÃÀà»ò¸Ã½Ó¿ÚµÄ¶þ½øÖƱíʾ£¬²¢¸ù¾ÝÕÒµ½µÄ¶þ½øÖƱíʾ(ͨ³£ÊÇÓÉJava±àÒëÆ÷´´½¨µÄÀàÎļþ)´´½¨Ò»¸öClass¶ÔÏ󡣸ÃClass¶ÔÏóÖзâ×°ÁËÀà»ò½Ó¿ÚµÄÔËÐÐʱ״̬¡£
(2) Á´½Ó£ºÁ´½ÓÕâÒ»¹ý³ÌÊÇָȡµÃÒѼÓÔØµÄ ......

ÓûìÏýÆ÷±£»¤ÄãµÄJAVA(.class)´úÂë(¶þ)

µÚ¶þÖÖ¼òµ¥µÄ·½·¨¾ÍÊÇ,ÔÚhttp://proguard.sourceforge.net/ÏÂÔØZIP°ü.×îеÄÊÇ4.5BETA
 ½âѹËõºó,Ë«»÷proguardgui.jar
 ÔËÐÐÈí¼þ
 ×îɵ¹ÏµÄÉèÖ÷½·¨:ÉèÖúÃINPUT/OUTPUT,µãPROCESS.½á¹û¾Í³öÀ´ÁË.
Éú³ÉÁË.a.class.b.class ÓÃJAD·´±àÒë,JADÌáʾ:²»ÄÜÍêÕûµÄ·´±àÒë....,´ò¿ª±àÒëºóµÄ´úÂë±äÁ¿ºÍº¯ÊýÃûÈ«²¿±»Ì ......

Java°æ½«EXCEL±íÊý¾Ýµ¼Èëµ½Êý¾Ý¿âÖÐ

      ¿ÉÄܺܶ࿪·¢Õß»áÃæ¶Ô¿Í»§ÕâÑùµÄÐèÇó£¬ÔÚδʹÓÃϵͳ֮ǰ£¬ËûÃǺܶàÊý¾Ý¶¼ÊDZ£´æÔÚWord»òÕßExcelµÈһЩµç×Ó±í¸ñÖУ¬ÏÖÔÚËûÃÇÐèÒª½«Ô­À´µÄÊý¾Ý×Ô¶¯µ¼È뵽ϵͳÖÐÈ¥£¬¶ø²»ÊÇÒ»ÌõÒ»ÌõµØÊÖ¹¤Â¼Èë¡£ÎÒ¾ÍÅöµ½ÁËÕâÑùµÄÐèÇ󣬾­¹ýÒ»·¬ÕÛÌÚÖ®ºó£¬ÖÕÓÚʵÏÖÁË£¬ÎÒÊDzÉÓõÚÈý·½¿Ø¼þJXLʵÏֵģ¬Ô­ÀíÊDZȽϼ ......

java»ñÈ¡ËùÓÐϵͳ±äÁ¿

public static void getSysProp(){
Properties props = System.getProperties();
Set<Entry<Object,Object>> res = props.entrySet();
Iterator it = res.iterator();
while (it.hasNext())
{
Map.Entry e = (Map.Entry)it.next();
......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØͼ | ¸ÓICP±¸09004571ºÅ