É÷ÓÃJava×°ÏäÓë²ðÏä
ת×Ôhttp://xyiyy.javaeye.com/blog/358401
J2SE5.0ºóÌṩÁË×Ô¶¯×°ÏäÓë²ðÏäµÄ¹¦ÄÜ£¬´Ë¹¦ÄÜÊÂʵÉÏÊDZàÒëÆ÷À´°ïÄúµÄ棬±àÒëÆ÷ÔÚ±àÒëʱÆÚÒÀÄúËù±àдµÄ·½·¨£¬¾ö¶¨ÊÇ·ñ½øÐÐ×°Ïä»ò²ðÏ䶯×÷¡£ÀýÈ磺
Integer i = 100;
Ï൱ÓÚ±àÒëÆ÷ΪÄú×÷ÒÔϵÄÓï·¨±àÒ룺
Integer i = new Integer(100);
ËäÈ»´Ë¹¦Äܷܺ½±ã£¬µ«ÔÚ³ÌÐòÔËÐн׶ÎÄúµÃÁ˽âJavaµÄÓïÒå¡£ÈçÏÂÃæµÄ³ÌÐòÄܱàÒëͨ¹ý£º
Integer i = null;
int j = i;
´Ë³ÌÐò±àÒëʱͨ¹ý£¬µ«ÔËÐÐʱ»áÓдíÎó¡£ÒòΪÕâÖÖд·¨Ï൱ÓÚ£º
Integer i = null;
int j = i.intValue();
ÓÉÓÚiʵ¼ÊÉÏûÓвο¼ÖÁÈκεĶÔÏó£¬ËùÒÔ²»ÄܲÙ×÷intValue()·½·¨£¬ÉÏÃæ³ÌÐòÔËÐÐʱ»á³öÏÖNullPointerException´íÎó¡£
×Ô¶¯×°Ïä¡¢²ðÏäµÄ¹¦ÄÜÌṩÁË·½±ãÐÔ£¬µ«Òþ²ØÁËһϸ½Ú£¬ËùÒÔ±ØÐëСÐÄ¡£ÈçÏÂÁдúÂë1£º
public class AutoBoxDemo2
{
public static void main(String[] args)
{
Ïà¹ØÎĵµ£º
class TestTryFinallyC {
public static void main(String[] args) {
System.out.println(testt());
}
public static int testt() {
int x = 99;
try {
return x;
}finally {
x = 8;
}
}
}
ijÄêijÔµÄijһÌ죬 ......
tomcatΪһ¸öjspºÍservletµÄÈÝÆ÷£¬µ«Ëü³ýÁËÕâ¸öÍ⻹×Ô´øÁËweb·þÎñÆ÷¡£Ò²¾ÍÊÇ˵£¬Ëü¼ÈÊÇservletÈÝÆ÷£¬Ò²ÊÇÒ»¸öweb·þÎñÆ÷¡£
ËüÊÇÓÃjava±àдµÄ£¬ÓÃÀ´Ö´ÐÐservletºÍjspµÄ£¬µ«´¦Àí¾²Ì¬×ÊÔ´ÉÏapacheµÈרҵ·þÎñÆ÷¹¦ÄÜÄÇôǿ¡£ËùÒԺܶàÈËÔ¸Ò⽫Á½Õß½áºÏÆðÀ´Ê¹Óá£tomcat´¦Àí¶¯Ì¬Ò³Ãæ£¬¶øappache´¦Àí¾²Ì¬×ÊÔ´£¬ÕâÑùÁ½Õ߸÷È¡Ëù³¤¡£Áí ......
ÔÚjavaÖпÉÒÔͨ¹ýRuntime.getRuntime().exec(cmd)À´Ö´ÐÐÍⲿÃüÁÎұȽϳ£ÓõÄÊǵ÷ÓÃshell½Å±¾À´Íê³ÉijЩ¹¤×÷£¬Ò²¿ÉÒÔÖ±½ÓÖ´ÐÐÒ»¸öos µÄÃüÁ±È½Ïµ÷ÓÃimagemagickÀ´Íê³ÉͼƬµÄһЩ²Ù×÷£¬ÆäÖÐÐèҪעÒâµÄÓÐÁ½µã£¬1ÊÇ×îºÃ´øÉÏÃüÁîµÄÍêÕû·¾¶,·ñÔòÃüÁî¿ÉÄܲ»»á±»Ö´ÐУ¬¶øÇÒҲûÓÐÈκα¨´íµÄÐÅÏ¢Êä³ö£¬2ÌØ±ðҪעÒâ¿Õ¸ñ£¬±ÈÈçÎÄ ......
1£®´Ó×ÜÌ忴ʼþ»úÖÆ
Æäʵʼþ»úÖÆÊÇÒ»ÖÖ´¦ÀíÊÀ½çµÄ·½Ê½ºÍ·½·¨¡£´«Í³µÄ˳Ðò³ÌÐòÉè¼Æ×ÜÊǰ´ÕÕÁ÷³ÌÀ´°²ÅÅËù×öµÄ¹¤×÷£¬¶øÊ¼þ»úÖÆµÄÌØµãÔÚÓÚ£ºµÈ´ý£¬Èç¹ûÓÐÊÂÇé·¢ÉúÔò´¦ÀíÖ®¡£ÕâÑùµÄºÃ´¦ÊÇ˳Ðò³ÌÐòÉè¼ÆÔÚûÓÐÊÂÇé×öµÄʱºòÒ²±ØÐëÑ»·ÔËÐУ¬×öºÁÎÞЧÂʵĿյÄÑ»·¹¤×÷¡£¶øÊ¼þ»úÖÆÔÚûÓÐÊÂÇéµÄʱºòÔò¿ÉÒÔ²»×öÈκÎÊÂÇéµÄµÈ´ý£¬´Ó¶ ......
Hibernate
Hibernate
ÊÇÒ»¸öÓÅÐãµÄ³Ö¾Ã»¯¿ò¼Ü
˲ʱ״̬£¬³Ö¾Ã״̬
ORM
£º¶ÔÏó¹ØÏµÓ³É䣬Íê³É¶ÔÏóÊý¾Ýµ½¹ØÏµÊý¾ÝµÄÓ³Éä»úÖÆ
ʹÓÃ
Hibernate
µÄÈýÏî×¼±¸¹¤×÷ÊÇ£º
1¡¢
Ìí¼Ó
hibernate
¿â
......