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

Java±ÊÊԱؿ¼Ì⣨һ£©ÀàµÄ³õʼ»¯Ë³Ðò

´ó¼ÒÔÚÈ¥²Î¼ÓÃæÊÔµÄʱºò£¬¾­³£»áÓöµ½ÕâÑùµÄ¿¼Ì⣺¸øÄãÁ½¸öÀàµÄ´úÂ룬ËüÃÇÖ®¼äÊǼ̳еÄ
¹Øϵ£¬Ã¿¸öÀàÀïÖ»Óй¹ÔìÆ÷·½·¨ºÍһЩ±äÁ¿£¬¹¹ÔìÆ÷Àï¿ÉÄÜ»¹ÓÐÒ»¶Î´úÂë¶Ô±äÁ¿Öµ½øÐÐÁËij
ÖÖÔËË㣬ÁíÍ⻹ÓÐһЩ½«±äÁ¿ÖµÊä³öµ½¿ØÖÆ̨µÄ´úÂ룬ȻºóÈÃÎÒÃÇÅжÏÊä³öµÄ½á¹û¡£Õâʵ¼Ê
ÉÏÊÇÔÚ¿¼²éÎÒÃǶÔÓڼ̳ÐÇé¿öÏÂÀàµÄ³õʼ»¯Ë³ÐòµÄÁ˽⡣
ÎÒÃÇ´ó¼Ò¶¼ÖªµÀ£¬¶ÔÓÚ¾²Ì¬±äÁ¿¡¢¾²Ì¬³õʼ»¯¿é¡¢±äÁ¿¡¢³õʼ»¯¿é¡¢¹¹ÔìÆ÷£¬ËüÃǵijõʼ»¯
˳ÐòÒÀ´ÎÊÇ£¨¾²Ì¬±äÁ¿¡¢¾²Ì¬³õʼ»¯¿é£©>£¨±äÁ¿¡¢³õʼ»¯¿é£©>¹¹ÔìÆ÷¡£ÎÒÃÇÒ²¿ÉÒÔͨ¹ýÏÂ
ÃæµÄ²âÊÔ´úÂëÀ´ÑéÖ¤ÕâÒ»µã£º
Java ´úÂë
public class InitialOrderTest {
// ¾²Ì¬±äÁ¿
public static String staticField = "¾²Ì¬±äÁ¿";
// ±äÁ¿
public String field = "±äÁ¿";
// ¾²Ì¬³õʼ»¯¿é
static {
System.out.println(staticField);
System.out.println("¾²Ì¬³õʼ»¯¿é");
}
// ³õʼ»¯¿é
{
System.out.println(field);
System.out.println("³õʼ»¯¿é");
}
// ¹¹ÔìÆ÷
public InitialOrderTest() {
System.out.println("¹¹ÔìÆ÷");
}
public static void main(String[] args) {
new InitialOrderTest();
}
}
ÔËÐÐÒÔÉÏ´úÂ룬ÎÒÃÇ»áµÃµ½ÈçϵÄÊä³ö½á¹û£º
1. ¾²Ì¬±äÁ¿
2. ¾²Ì¬³õʼ»¯¿é
3. ±äÁ¿
4. ³õʼ»¯¿é
5. ¹¹ÔìÆ÷
ÕâÓëÉÏÎÄÖÐ˵µÄÍêÈ«·ûºÏ¡£ÄÇô¶ÔÓڼ̳ÐÇé¿öÏÂÓÖ»áÔõÑùÄØ£¿ÎÒÃÇÈÔÈ»ÒÔÒ»¶Î²âÊÔ´úÂëÀ´»ñ
È¡×îÖÕ½á¹û£º
Java´úÂë £º
class Parent {
// ¾²Ì¬±äÁ¿
public static String p_StaticField = "¸¸Àà--¾²Ì¬±äÁ¿";
// ±äÁ¿
public String p_Field = "¸¸Àà--±äÁ¿";
// ¾²Ì¬³õʼ»¯¿é
static {
System.out.println(p_StaticField);
System.out.println("¸¸Àà--¾²Ì¬³õʼ»¯¿é");
}
// ³õʼ»¯¿é
{
System.out.println(p_Field);
System.out.println("¸¸Àà--³õʼ»¯¿é");
}
// ¹¹ÔìÆ÷
public Parent() {
System.out.println("¸¸Àà--¹¹ÔìÆ÷");
}
}
public class SubClass extends Parent {
// ¾²Ì¬±äÁ¿
public static String s_StaticField = "×ÓÀà--¾²Ì¬±äÁ¿";
// ±äÁ¿
public String s_Field = "×ÓÀà--±äÁ¿";
// ¾²Ì¬³õʼ»¯¿é
static {
System.out.println(s_StaticField);
System.out.println("×ÓÀà--¾²Ì¬³õʼ»¯¿é");
}
// ³õʼ»¯¿é
{
System.out.println(s_Field);
System.out.println("×ÓÀà--³õʼ»¯¿é");
}
// ¹¹ÔìÆ÷
public SubClass() {
System.out.println("×ÓÀà--¹¹


Ïà¹ØÎĵµ£º

Java±ÊÊÔÃæÊÔÌâ


1¡¢Êý¾Ý¿âÐÔÄÜÓÅ»¯ÓÐÄÇЩ´ëÊ©£¨ORACLE/SYBASE/DB2/SQLSERVERÑ¡Ò»ÖÖ£©2¡¢Ð´Ò»¸ö³ÌÐò£¬°Ñ×Ö·û´®µ¹Ðð£¬ÒªÇó“ÄãºÃѽ”±äΪ“ѽºÃÄ㔣¨´¦ÀíÖÐÎÄ£©3¡¢Ãû´Î½âÊÍ£¨¼Ì³Ð¡¢ÖØÔØ¡¢½Ó¿Ú£©4¡¢JAVAÏß³ÌʵÏÖÓÐÄÇЩ·½·¨£¬ËµÃ÷Ö®5¡¢JAVAÄÚ´æÒÅ©ʲôԭÒò6¡¢´ÓÏîÄ¿¹ÜÀí½Ç¶È·ÖÎöÐèÇó±ä¶¯µÄ¿ØÖÆ7¡¢JAVA SERVLETµÄÉ ......

¸´Ï°¡¶Thinking in Java¡·±Ê¼Ç¶þ:µÚ¾Å¡¢Ê®Õ±ʼÇ

1.½Ó¿ÚµÄ·½·¨Ä¬È϶¼ÊÇpublic µÄ£¬·½·¨Ö»ÄÜÊÇpublic&abstract,·½·¨µÄʵÏÖ²»ÄÜСÓÚ½Ó¿Ú·½·¨µÄvisibality.
    ½Ó¿ÚÖеÄÓòĬÈÏÊÇpublic static finalµÄ¡£
  Ò»¸öÀà¿ÉÒÔʵÏֺܶà¸ö½Ó¿Ú¡£
2.ÄÚ²¿Àà¾ßÓÐÍâΧÀࣨenclosing class£©µÄËùÓÐÔªËصķÃÎÊȨ¡£
3.ÄäÃûÀàÈç¹ûÏ£ÍûÊÇÓÐÒ»¸öÔÚÆäÍⲿ¶¨ÒåµÄ¶ÔÏó£¬ ......

java Map ±éÀú·½·¨

µÚÒ»ÖÖ:ЧÂʸß
Map map = new HashMap();
Iterator iter = map.entrySet().iterator();
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) iter.next();
Object key = entry.getKey();
Object val = entry.getValue();
}
µÚ¶þÖÖ:ЧÂʵÍ,ÒÔºó¾¡Á¿ÉÙʹÓã¡
Map map = new HashMap();
......

java³ÌÐòÔ±Èý¾³½ç

1.1.1 ÐÞÁ¶µÚÒ»²ã¾³½ç£º½£Ö¸ËÄ·½£¬ÊÔÎÊÌìÏÂÓëÕù·æ
ÐÞÁ¶µÚÒ»²ã¾³½çµÄ³ÌÐòÔ±£¬¶ÔJava¿ª·¢¼¼Êõ¾¡ÊýÕÆÎÕ£¬¿ª·¢¹¤¾ßÕÆÎÕµÃÒ²½ÏΪæµÊì¡£¿ÉÒÔ½«µÚ¶þ²ã´Î³ÌÐòÔ±½»¸øµÄÈÎÎñÍê³ÉµÃºÜ³öÉ«£¬¿ÉÒÔ°´ÒªÇó¶ÀÁ¢Íê³ÉÀà¡¢½Ó¿ÚºÍËã·¨µÄ¿ª·¢¡£×¢Öؼ¼ÇÉ£¬¶Ô¾ßÌåµÄ±à³ÌÓïÑԷdz£ÊìϤ¡£
ÄÜÁ¦Ö®Ëù¼°£¬½ÔÎÞ²»ÓÃÆ伫¡£ÈÏΪËùÓпª·¢ÖªÊ¶£¬Ô½ÊÇ¿´Æ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØͼ | ¸ÓICP±¸09004571ºÅ