JAVA Ö®"·´Éä"
1¡¢ÀàÐÍÄ£°å Class£º
ÎïÒÔÀà¾Û£º
ÎÒÃÇ¿ÉÒÔÓÃclass Person{ } class Animal{ }À´ÃèÊöÒ»ÀàÈË»òÒ»ÀදÎ
ÄÇôÔÙÏëһϣ¬ÎÒÃÇÊDz»ÊÇ¿ÉÒÔÓÃclass Class{ } À´³éÏóÃèÊöÀàÄØ£¿
´ð°¸Ê±¿ÉÒԵģ¬Õâ¾ÍÊÇjdkÖÐµÄ Class ÀࣨÀàÐÍÄ£°å£©£¬
ClassÀàÒ²¿ÉÒÔ¼òµ¥µÄÀí½âΪÃèÊöÀàµÄÀࣻ
ÎÒÃǵõ½Ò»¸öÀàµÄÀàÐÍÄ£°å¾ÍÏñµÃµ½ÁËÒ»¸öÈ˵ÄDNA£¬
DNAÖаüº¬µÄÒ»¸öÈ˵ÄËùÓÐÍⲿÐÎÌ¬ÌØÕ÷£¬
ij¸öÀàµÄClassÀàÐÍÄ£°åÖÐÒ²¾Í°üº¬µÄ¸ÃÀàµÄËùÓÐÌØÕ÷£¨ÈçÀàÃû¡¢°üÃû¡¢·½·¨……µÈ£© ¡£
ËùÒÔÎÒÃÇ Ö»ÒªµÃµ½ÁËÒ»¸öÀàµÄÀàÐÍÄ£°å£¬¾ÍÄܽ«Ò»¸öÀàÆÊÎöµÄºÜÇå³þ¡£
2¡¢»ñÈ¡ClassÀàÐÍÄ£°å¶ÔÏóµÄ·½·¨£º
(1)£ºÍ¨¹ý¶ÔÏóµ÷ÓÃgetClass()·½·¨´´½¨¡£
(2)£ºÀûÓÃClassÀàÖеÄforName()·½·¨À´´´½¨¡£
(3)£ºÀûÓÃÀàÐÍÃû(ÀàÃû)À´´´½¨¡£
3¡¢Í¨¹ý·´Éä·½·¨¶¯Ì¬À´»ñÈ¡ÀàÖеķ½·¨ÒÔ¼°¹¹Ô캯Êý£¨Îå²½£©¡£
(1).ÏÈ»ñÈ¡ÀàÐÍÄ£°å¶ÔÏó£¬
¡¶1¡·Student stu=new Student();
Class c=stu.getClass();
¡¶2¡·Class c=Class.forName("ÀàÈ«Ãû");
¡¶3¡·Class c=Student.class;
(2).ͨ¹ýÀàÐÍÄ£°å¶ÔÏóÀ´»ñÈ¡¹¹Ô캯Êý
¡¶1¡·»ñÈ¡ÎÞ²Î(ĬÈϹ¹Ôì)
Class[] arr={};//¹¹Ôì·½·¨µÄ²ÎÊý ÀàÐÍ¡¢Ë³Ðò¡¢¸öÊý£¬´Ë´¦ÎªÎ޲ι¹Ôì¡£
Constructor con=c.getDeclaredConstructor(arr);
¡¶2¡·»ñÈ¡Óвι¹Ôì
Class[] arr={String.class,int.class,Integer.class};// ¹¹Ôì·½·¨µÄ²ÎÊý ÀàÐÍ¡¢Ë³Ðò¡¢¸öÊý¡£
Constructor con=c.getDeclaredConstructor(arr);
(3).µ÷Óù¹Ôì·½·¨´´½¨¶ÔÏó
&nbs
Ïà¹ØÎĵµ£º
ÔÚ±àÒëandroid code ³öÏÖ°æ±¾²»¶ÔµÄÎÊÌ⣺
ÃèÊöÈçÏ£º
You are attempting to build with the incorrect version
of java.
Your version is: java version "1.6.0_17".
The correct version is: 1.5.
Please follow the machine setup instructions at
http://source.android.com/download
ÍøÉÏÓÐÈËÌṩ½â¾ö·½·¨ÈçÏ ......
public class Test {
public static void main(String args[]) {
int i;
int j;
for (i = 1; i <= 9; i++) {
for (j = 1; j <= i; j++) {
if (j * i <= 9)
System.out.print(j ......
ÆäÊµÕÆÎÕ
MappedByteBuffer
²¢²»ÄÑ£¬Ö»Òª¼Çס“Èý·½Èý·¨ÈýÌØÐÔ”£¨ÎÒ×Ô¼º×ܽáµÄ£¬ºÇºÇ
~~
²»ÒªÈÓ¼¦µ°Å¶¡£¡£¡££©Õâ¾ä»°¾Í¿ÉÒÔÇáËɸ㶨£¡
MappedByteBuffer
Ö»ÊÇÒ»ÖÖÌØÊâµÄ
ByteBuffer
£¬¼´ÊÇ
ByteBuffer
µÄ×ÓÀà¡£
MappedByteBuffer
½«ÎļþÖ±½ÓÓ³Éäµ½Äڴ棨ÕâÀïµÄÄÚ´æÖ¸µÄÊÇÐéÄâÄڴ棬²¢² ......
Ò»¡¢JDBCµ÷Óô洢¹ý³Ì
creat proc proc_select
¡¡¡¡@pid varchar(20)
¡¡¡¡@address varchar(20) output
¡¡¡¡as
¡¡¡¡select @address=address from userinfo where pid=@pid
¡¡¡¡go
¡¡¡¡ÓÃjavaµ÷ÓÃ:
¡¡¡¡class.forName(\"sun.jdbc.odbc.JdbcOdbcDriver\"); //¼ÓÔØÇý¶¯
¡¡¡¡Connection con=DriverManager.ge ......
²»ÌᳫʹÓõķ½·¨ÊÇΪ֧³ÖÏòºó¼æÈÝÐÔ¶ø±£ÁôµÄÄÇЩ·½·¨£¬ËüÃÇÔÚÒÔºóµÄ°æ±¾ÖпÉÄܳöÏÖ£¬Ò²¿ÉÄܲ»³öÏÖ¡£Java ¶àÏß³ÌÖ§³ÖÔÚ°æ±¾ 1.1 ºÍ°æ±¾ 1.2 ÖÐ×öÁËÖØ´óÐÞ¶©£¬stop()¡¢suspend() ºÍ resume() º¯ÊýÒѲ»ÌᳫʹÓá£ÕâЩº¯ÊýÔÚ JVM ÖпÉÄÜÒýÈë΢ÃîµÄ´íÎó¡£ËäÈ»º¯ÊýÃû¿ÉÄÜÌýÆðÀ´ºÜÓÕÈË£¬µ«ÇëµÖÖÆÓÕ»ó²»ÒªÊ¹ÓÃËüÃÇ¡£
µ÷ÊÔÏ̻߳¯µÄ ......