Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

Java: class , objects

Java: class , objects
1 Inheritance(¼Ì³Ð)µÄ¹Ø¼ü×Öextends
class MountainBike extends Bicycle {
}
µ«ÊDz»ÄܶàÖØ¼Ì³Ð¡£²»¹ý¿ÉÒÔͨ¹ýimplements¶à¸öinterfaceÀ´ÊµÏÖÀàËÆµÄ¶«Î÷
2 interface
interface Bicycle {
       void changeCadence(int newValue);   // wheel revolutions per minute
       void changeGear(int newValue);
       void speedUp(int increment);
       void applyBrakes(int decrement);
}
class ACMEBicycle implements Bicycle {
   // remainder of this class implemented as before
}
¿ÉʵÏÖ(implements)¶à¸öinterface
class MyClass extends MySuperClass implements YourInterface {
    //field, constructor, and method declarations
}
means that MyClass is a subclass of MySuperClass and that it implements the YourInterface interface
3 package
A package is a namespace that organizes a set of related classes and interfaces.
4 Access Modifier
public, private, protected
public class Bicycle {
     private int cadence;
     public int aag;
     public void test();
}
ÿ¸öfield»òmethod¶¼±ØÐëµ¥¶ÀÐÞÊÎ
 
Access Levels
ModifierClassPackageSubclassWorld
public
Y
Y
Y
Y
protected
Y
Y
Y
N
no modifier
Y
Y
N
N
private
Y
N
N
N
Ô¼¶¨£º
class Ãû×ֵĵÚÒ»¸ö×Öĸ´óд; methodµÚÒ»¸öwordÊǶ¯´Ê
5 Constructors
The compiler automatically provides a no-argument, default constructor for any class without constructors.
This default constructor will call the no-argument constructor of the superclass.
6 method & parameter
The Java programming language doesn't let you pass methods into methods. But you can pass an object into a method and then invoke the object's methods.
 can Returning a Class or Interface??
7 this : current object
public class Point {
public int x = 0; //field¿ÉÒÔÕâÑù³õʼ»¯
public int y = 0;


Ïà¹ØÎĵµ£º

¹òÇójava¼àÌýÆ÷Ô­Àí

 Java ×îеÄʼþ´¦Àí·½·¨ÊÇ»ùÓÚÊÚȨʼþÄ£ÐÍ
ʼþÔ´Éú³Éʼþ²¢½«Æä·¢ËÍÖÁÒ»¸ö»ò¶à¸ö¼àÌýÆ÷
¼àÌýÆ÷¼òµ¥µØµÈ´ý£¬Ö±µ½ËüÊÕµ½Ò»¸öʼþ¡£Ò»µ©Ê¼þ±»½ÓÊÜ£¬¼àÌýÆ÷½«´¦ÀíÕâЩʼþ£¬È»ºó·µ»Ø¡£
ʼþ£ºÔÚÊÚȨʼþÄ£ÐÍÖУ¬Ê¼þÊÇÒ»¸öÃèÊöʼþԴ״̬¸Ä±äµÄ¶ÔÏó ¡£ 
ͨ¹ýÊó±ê¡¢¼üÅÌÓë GUI ½çÃæÖ±½Ó»ò¼ä½Ó½»»¥¶¼»áÉú³ÉÊ ......

£¨×ª£©¹ØÓÚjava¿ªÔ´

http://blog.ixpub.net/html/36/16577236-371599.html
06Äê11Ô£¬Sun¹«Ë¾¸ß²ã¹ÙÔ±Ðû²¼£º±à³ÌÓïÑÔJava¿ª·ÅÔ´Â룬²¢ÇÒ×ñÊØGPL¹æÔò£¬²©µÃһƬºÃÆÀ¡£¾­¹ý°ëÄêµÄ²»Ð¸Å¬Á¦£¬SunÖÕÓڰѾßÓÐ 600¶àÍòÐеÄJavaÔ´´úÂ루ָJDKÈí¼þ°ü£©ÕûÀí£¨ÇåÀí£©Íê±Ï£¬¼ÓÒÔ¹«²¼£¬Ê¹Java±äΪÍêÈ«¿ÉÓã¨fully buildable£©µÄ¿ªÔ´±à³ÌÓïÑÔ¡£07Äê5ÔÂ8È ......

Éî¿ÌÀí½âJava±à³ÌµÄ7¸öÀý×Ó

 Éî¿ÌÀí½âJava±à³ÌµÄ7¸öÀý×Ó   Ù¡Ç¿ 2009Äê11ÔÂ7ÈÕ http://blog.csdn.net/microtong
 1. ÔĶÁÏÂÁдúÂë»Ø´ðÎÊÌ⣨µÚÒ»¸öJava³ÌÐò£¬Àí½âPATHºÍCLASSPATH£¬Ñ§»áʹÓÃjavacºÍjavaÃüÁ
view plaincopy to clipboardprint?
package cn.edu.uibe;  
public class HelloWorld {  
......

java±Ê¼Ç

½ñÌìÖØÐÂÕûÀíµçÄÔ£¬ÕÒµ½Ò»¸öÎļþ£¬¿´ÁËÏÂÈÕÆÚ£¨2006.11.3£© £¬Å²»Ð¡ÐÄÔÙ¶ªÁË£¬´æµ½ÍøÉÏÀ´É¹É¹¡£
 ¹Ø¼ü×ÖÓֳƱ£Áô×Ö£¬ÊÇ Java ÓïÑԹ涨ÁËÌØ¶¨º¬ÒåµÄ±êʶ·û¡£Óû§Ö»Äܰ´ÕÕϵͳ¹æ¶¨µÄ·½Ê½Ê¹Ó㬲»ÄÜ×ÔÐж¨Òå¡£¹Ø¼ü×ÖÒ»ÂÉÓÃСд×Öĸ±íʾ¡£Java ÖеĹؼü×ÖÓÐ 50 ¸ö£¬°´ÓÃ;»®·ÖΪ£ºÊý¾ÝÀàÐÍ¡¢Óï¾ä¡¢ÐÞÊΡ¢·½·¨¡¢Àà¡¢ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ