JAVA¹æ·¶Ñ§Ï°——String×ÖÃæ³£Á¿
package testPackage;
class Test {
public static void main(String[] args) {
String hello = "Hello", lo = "lo";
System.out.print((hello == "Hello") + " ");
System.out.print((Other.hello == hello) + " ");
System.out.print((other.Other.hello == hello) + " ");
System.out.print((hello == ("Hel"+"lo")) + " "); //(1)
System.out.print((hello == ("Hel"+lo)) + " "); //(2)
System.out.println(hello == ("Hel"+lo).intern());
}
}
class Other { static String hello = "Hello"; }
package other;
public class Other { static String hello = "Hello"; }
ÔËÐнá¹ûÈçÏ£º
true true true true false true
½á¹û½âÊÍ£º
1. ËùÓÐString×ÖÃæÁ¿£¬²»¹ÜÆäËùÔÚµÄclassºÍpackage£¬¶¼ÊÇͬһ¸öString¶ÔÏóµÄÒýÓÃ
2. ¶ÔÓÚ³£Á¿±í´ïʽ¼ÆËãµÄString£¬¶¼ÊÇÔÚ±àÒëÆÚ¼ä¼ÆËãµÄ£¬±»µ±×÷String×ÖÃæÁ¿¿´´ý¡£ÀýÈç(1)ÐÐËùÔڵĴúÂë
3. ¶ÔÓÚÔÚÔËÐÐÆÚÁ¬½ÓµÄString£¬¶¼ÊÇд´½¨µÄ£¬Òò´Ë²»Ïàͬ¡£ÀýÈç(2)ÐÐËùÔڵĴúÂë
Ïà¹ØÎĵµ£º
À´Ô´£ºhttp://bbs.hackline.net/thread-3620-1-1.html
Òþ²Ø¾ßÌåʵÏÖÊÇJavaÓïÑÔµÄÖ÷ÒªÌØµãÖ®Ò»¡£ÕýÊÇÒòΪÕâ¸öÔÒò£¬ËùÒÔJavaÓïÑÔµÄÒÆÖ²ÐÔ¾ÍÌØ±ðºÃ¡£ÈçÓиö³ÌÐòÔ±±àдÁËÒ»¸öʵÏÖËæ»úÊýµÄ³ÌÐò¿â£¬ÄÇôÆäËû
³ÌÐò¿ª·¢ÈËÔ±Ö»ÐèÒªÖªµÀÕâ¸ö³ÌÐò¿âÐèÒª´«ÈëÄÇЩ²ÎÊý£¬¾Í¿ÉÒÔʹÓÃÕâ¸öÀà¡£ÏÖÔÚÎÞÂÛÊÇÍøÉÏ»¹ÊÇÆ½Ê±µÄ¹¤×÷ÖУ¬ÓкܶàÏÖ³É ......
http://www.sdau.edu.cn/support/html/java03.htm
1.3 ¼ò µ¥ µÄ Java³Ì Ðò
ÏÂ Ãæ ÎÒ ÃÇ ÏÈ ½é ÉÜ Á½ ¸ö ¼ò µ¥ µÄ Java³Ì Ðò ,²¢ ¶Ô Æä ½ø ÐÐ ·Ö Îö¡£
Àý 1.1.
public class HelloWorldApp { //an application
public static void main (String args[ ]){
System.out.println("Hello World!");
}
}
± ......
Java Class Attribute Type Hibernate Type Possible SQL Type-Vendor Specific
Integer, int, long short &n ......
MD5Ëã·¨ÊÇÒ»Öַdz£ÓÅÐãµÄ¼ÓÃÜËã·¨¡£
MD5¼ÓÃÜËã·¨ÌØµã£ºÁé»îÐÔ¡¢²»¿É»Ö¸´ÐÔ¡£
½éÉÜMD5¼ÓÃÜËã·¨»ù±¾Çé¿öMD5µÄÈ«³ÆÊÇMessage-Digest Algorithm 5£¬ÔÚ90Äê´ú³õÓÉMITµÄ¼ÆËã»ú¿ÆÑ§ÊµÑéÊÒºÍRSA Data Security Inc·¢Ã÷£¬¾MD2¡¢MD3ºÍMD4·¢Õ¹¶øÀ´¡£
Message-Digest·ºÖ¸×Ö½Ú´®(Message)µÄHas ......