Java±ÊÊÔÌ⡾ת¡¿
1.д³ö³ÌÐòÔËÐнá¹û
public
class
TestString {
public
static
void
link(String a){
a+="World"
;
}
public
static
void
main(String []args){
String a = "Hello"
;
link(a);
System.out.println(a);
}
}
´ð: ÕâµÀÌ⿼Á½¸ö·½Ãæ:
1).¡¡String¶ÔÏóµÄÄÚÈÝÊDz»ÄܸıäµÄ,a+="World"²¢²»ÊǰÑaËùÖ¸¶ÔÏó¸Ä±ä,
¡¡¡¡¶øÊÇÏÈÉú³ÉÒ»¸öÁÙʱString¶ÔÏó,ÆäֵΪa+"World",È»ºóÔÚ°ÑÕâ¸öÁÙʱ
¡¡¡¡¶ÔÏ󸳸øa.
2).¡¡JavaÖк¯Êý²ÎÊý´«µÝ·½Ê½ÎªCall by value,link·½·¨ÖлáÉú²úaµÄÒ»¸ö
¡¡¡¡¿½±´,ͬÑùÖ¸ÏòaËùÖ¸µÄ¶ÔÏó,×ÛºÏÒÔÉÏÁ½µã,µÃ³ö½á¹ûΪ Hello
2. д³öÏÂÃæ´úÂëµÄ½á¹û
System.out.println(
"
ja
"
+
"
va
"
==
"
java
"
);
´ð:"=="ÓÃÀ´±È½Ï¶ÔÏóµÄÒýÓÃ,¶øequals()ÓÃÀ´±È½Ï¶ÔÏóµÄÄÚÈÝ,µ«ÊÇÈç¹ûÊÇ×Ö·û´®³£Á¿,ÓÃ"=="Ò²¿ÉÒԱȽÏÄÚÈÝ
ÊÇ·ñÏàµÈ,"ja"+"va"ºÍ"java"¶¼ÊÇ×Ö·û´®³£Á¿,Òò´Ë½á¹ûΪtrue
ͬÀí,ÏÂÃæ´úÂë½á¹ûÒ²ÊÇtrue
final
String str
=
"
java
"
;
System.out.println(str
==
"
java
"
)
3.¼Ì³ÐʱºòÀàµÄÖ´ÐÐ˳ÐòÎÊÌâ,Ò»°ã¶¼ÊÇÑ¡ÔñÌâ,ÎÊÄ㽫»á´òÓ¡³öʲô?
public
class
Parent {
//1
static
int
a = 1;
//2
static
{
a=10;
System.out.println("parent static
code"
);
}
//4
public
Parent(){
System.out.println("Parent constructor
Ïà¹ØÎĵµ£º
Ã²ËÆ±È½Ï¶à£¬²»¹ý¶à¶®µã£¬Ò²Ã»Ê²Ã´²»ºÃ¡£
1¡¢ÊìϤjdbc£¬»áÓÃjdbc¡£
2 »áдsqlºÍ´æ´¢¹ý³Ì¡£
3¡¢ÊìϤswing¿Ø¼þ¡¢²»¹ý²»½¨ÒéÓÃswing¿ª·¢¿Í»§¶Ë
4 ÊìϤ swt£¬rcp ¿Í»§¶Ë£¬½¨ÒéÓÃrcp¿ª·¢¿Í»§¶Ë
5 ÊìϤjsp servlet
6 ÊìϤtomcat£¬ÖÁÉÙÖªµÀweb¡£x ......
¼ÙÉèÐèÇó(ÈçÓÐÀ×ͬ£¬´¿ÊôÇɺÏ)£º
ÓÐÒ»¸öÈ«¹úÐԵĴóÆóÒµ£¬ÔÚÈ«¹ú¸÷µØÐèÒª²¿ÊðÉÏǧ̨¿Í»§»ú£¬ÕâЩ¿Í»§»úÐèҪʵʱÓë·þÎñÆ÷½»»¥£¬½øÐÐÊý¾Ý´¦Àí¡£ÊµÊ±ÐÔÒªÇó¸ß£¬°²È«ÐԸߣ¬ÒªÇóÖ§³ÖÊÂÎñ£¬ÒÔ¼°²»ÖжϷþÎñ¡£
Ó²¼þ²¿Êð£º
1¡¢ 3000̨¿Í»§»ú
2¡¢ 10̨· ......
ÕâÀïÖ÷Òª¶Ô8ÖÖÅÅÐòËã·¨×ö¸ö×ܽᣬ·Ö±ðÊDzåÈëÅÅÐò£¬Ñ¡ÔñÅÅÐò£¬Ã°ÅÝÅÅÐò£¬Ï£¶ûÅÅÐò£¬¹é²¢ÅÅÐò£¬¶ÑÅÅÐò£¬¿ìËÙÅÅÐòÒÔ¼°»ùÊýÅÅÐò¡£
1¡¢ ²åÈëÅÅÐò
±È½ÏºÍ½»»»µÄʱ¼ä¸´ÔÓ¶ÈΪO(n^2)£¬Ëã·¨×ÔÊÊÓ¦£¬¶ÔÓÚÊý¾ÝÒÑ»ù±¾ÓÐÐòµÄÇé¿ö£¬Ê±¼ä¸´ÔÓ¶ÈΪO(n)£¬Ëã·¨Îȶ¨£¬¿ªÏúºÜµÍ£¬ÊʺÏÓÚÊý¾ÝÒÑ»ù±¾ÓÐÐò»òÕßÊý¾ÝÁ¿Ð¡µÄÇé¿ö¡£
public void ins ......
ÔÚjavaÏîÄ¿¼¯³Éflex¿ª·¢ÔÚweb2.0ÊÇÊÇÒ»¸öÊ®·ÖÓмÛÖµµÄ¿ª·¢·½°¸£¬ÌرðÔÚÆóÒµ¼¶µÄÓ¦ÓÃÖУ¬flexºÍjava¼äµÄͨѶԽÏÔÖØÒª¡£µ«ÊÇÏÖÔÚµÄjavaºÍflexµÄ¿ò¼ÜËäÈ»¶à£¬µ«Êǹ²Í¨ÐÔ²»´ó¡£¾ÍÊÇͨ¹ý´«Í³µÄwebserviceµ÷Óã¬Ò²ÒòΪЧÂÊÎÊÌâºÍ½âÎöxmlµÄ·±ÖصŤ×÷£¬ºÜ¶àÏîÄ¿¿ª·¢ËٶȺÍά»¤ÏÞÖÆ½Ï´ó¡£ÔÚ½üÀ´ÏîÄ¿£¬ÎÒÔÚ¹«Ë¾³¢Ê ......