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3.1¡¢ÎªÊ²Ã´ÒªÓм̳Ð

ÏÖÔÚ¶¨ÒåÁ½¸öÀࣺPerson¡¢Student£¬°´ÕÕ֮ǰµÄ·½Ê½½øÐж¨Òå¡£ class Person{

private String name ; private int age ;

public void setName(String name){ this.name = name ; }

public void setAge(int age){ this.age = age ; }

public String getName(){ return this.name ; }

public int getAge(){ return this.age ; } };

class Student{

private String name ; private int age ;

private String school ;

public void setName(String name){ this.name = name ; }

public void setSchool(String school){ this.school = school ; }

public void setAge(int age){

this.age = age ; }

public String getSchool(){ return this.school ; }

public String getName(){ return this.name ; }

public int getAge(){ return this.age ; } };

ÔÚÉÏÃæµÄ´úÂëÖ®ÖдæÔÚÁËÖØ¸´¡£Ñ§ÉúÊÇÒ»¸öÈË¡£µ«ÊÇѧÉú±ÈÈ˱¾ÉíÖ»¶àÁËÒ»¸öѧУµÄÊôÐÔ¡£Èç¹ûÏÖÔÚ°´ÕÕ֮ǰµÄ·½Ê½±àд´úÂ룬Ôò»á·¢ÏÖ»áÖØ¸´¶¨ÒåºÜ¶àµÄÊôÐÔ»ò·½·¨£¬ÄÇô´Ëʱ£¬¾ÍÐèҪͨ¹ý¼Ì³ÐÀ´¶Ô³ÌÐò½øÐнøÒ»²½µÄÀ©Õ¹¡£ 3.2¡¢¼Ì³Ð»ù±¾Ñùʽ

¼Ì³Ð£¨extends£©£º±íʾÀ©Õ¹¡£À©Õ¹ÒÑÓÐÀàµÄ¹¦ÄÜ¡£ ¼Ì³ÐÔÚ³ÌÐòÖÐͨ¹ýextends¹Ø¼ü×ÖʵÏÖ£¬Óï·¨ÈçÏ£º class ×ÓÀà extends ¸¸Àà{}

ÀýÈ磺ÏÖÔÚÈÃѧÉúÀàÖ±½Ó¼Ì³ÐÁËPersonÀà class Person{

private String name ; private int age ;

public void setName(String name){ this.name = name ; }

public void setAge(int age){ this.age = age ; }

public String getName(){ return this.name ; }

public int getAge(){ return this.age ; } };

class Student extends Person{ };

public class OODemo02{

public static void main(String args[]){ Student s = new Student() ; s.setName(\ÕÅÈý\ s.setAge(30) ;

System.out.println(\ÐÕÃû£º\£»ÄêÁ䣺\

} };

ÔÚÒÔÉϵÄѧÉúÀàÖв¢Ã»Óж¨ÒåÁËÐÕÃûºÍÄêÁäµÄÊôÐÔ¼°setter¡¢getter·½·¨£¬µ«ÊÇÏÖÔÚͨ¹ý¼Ì³ÐÈ´¿ÉÒÔ°ÑÄÚÈÝÖ±½ÓÄõ½Ñ§ÉúÀàȥʹÓã¬ËùÒÔ´Ëʱ³ÆÑ§Éú¼Ì³ÐÁËÈËÀà¡£

¼Ì³ÐÊôÓÚÀ©³äÀàµÄ¹¦ÄÜ£¬ËùÒÔ´Ëʱ£¬Ö±½ÓÔÚѧÉúÀàÖмÓÈë×Ô¼ºÀ©³äµÄÊôÐÔ¼´¿É¡£ class Person{

private String name ; private int age ;

public void setName(String name){ this.name = name ; }

public void setAge(int age){ this.age = age ; }

public String getName(){ return this.name ; }

public int getAge(){ return this.age ; } };

class Student extends Person{ private String school ;

public void setSchool(String school){ this.school = school ; }

public String getSchool(){ return this.school ; } };

public class OODemo03{

public static void main(String args[]){ Student s = new Student() ; s.setName(\ÕÅÈý\ s.setAge(30) ;

s.setSchool(\±±¾©´óѧ\ System.out.println(\ÐÕÃû£º\£»ÄêÁ䣺\£»Ñ§Ð££º\ } };

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ÔÚÆäËûÓïÑÔÖУ¬ÀýÈçC++£¬Óï·¨ÊÇÖ§³Ö¶à¼Ì³ÐµÄ£¬»ù±¾µÄÑùʽ£º class ×ÓÀà extends ¸¸£±,¸¸£²,¡­{}

ÔÚJAVAÖÐÔÊÐí¶à²ã¼Ì³Ð¡£¶à²ã¼Ì³ÐµÄʱºò×ÓÀà»áÓµÓÐËùÓеÄÊôÐԺͷ½·¨¡£ class A{ };

class B extends A{ };

class C extends B{ };

3.3.2¡¢Ô¼¶¨¶þ

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3.3.3¡¢Ô¼¶¨Èý

¶ÔÒÑÓеijÌÐò½øÐÐһЩÀ©³ä¡£

ÔÚPersonÀàÖмÓÈëÒ»¸ö¹¹Ôì·½·¨£¬¿ÉÒÔͬʱΪnameºÍageÊôÐÔ¸³Öµ¡£ Ö®ºóÔÙ¼ÓÈëÒ»¸ö´òÓ¡ÐÅÏ¢µÄ·½·¨£¬¿ÉÒÔÈ¡µÃÒ»¸öÈËÔ±µÄÐÅÏ¢¡£ class Person{

private String name ; private int age ;

public Person(String name,int age){ this.setName(name) ; this.setAge(age) ; }

public void setName(String name){ this.name = name ; }

public void setAge(int age){ this.age = age ; }

public String getName(){ return this.name ; }

public int getAge(){ return this.age ; }

public String getInfo(){

return \ÐÕÃû£º\£¬ÄêÁ䣺\ } };

class Student extends Person{ private String school ;

public void setSchool(String school){ this.school = school ;