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[NHN NEXT] Java 강의- Week3
The document discusses inheritance in Java. It explains inheritance from conceptual and implementation perspectives. It provides examples of using inheritance to define a Killer class that extends the Person class to reuse common properties like name and age. This avoids duplicating code and allows the Killer class to inherit methods like introduce() from Person while adding its own methods like getWeapon(). The document also shows how a Musician class can extend Person to inherit name and age while adding an instrument property and play() method.
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[NHN NEXT] Java 강의- Week3
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- 40. To p ic s
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- 46. class Person { Stringname; int age; Person() { this(사람, 1); } Person(String name, int age) { this.name = name; this.age= age; } String introduce() { return 이름 : + name + , 나이 + age + 세; } } Person
- 47. Person yotsuba =new Person(요츠바, 5); System.out.println(yotsuba.introduce());
- 48. Person yotsuba =new Person(요츠바, 5); name = 요츠바 age = 5
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- 53. class Killer { Stringname; int age; String warning; String weapon; Killer(String name, int age, String warning, String weapon) { this.name = name; this.age = age; this.warning = warning; this.weapon = weapon ; } String introduce() { return 이름 : + name + , 나이 + age + 세; } String getWeapon() { return weapon; } } Killer
- 54. Killer killerYotsuba =new Killer(요츠바, 5, You can tell me in hell., 총); System.out.println(killerYotsuba.introduce()); System.out.println(killerYotsuba.getWeapon());
- 55. Killer killerYotsuba =new Killer(요츠바, 5, You can tell me in hell., 총); name = 요츠바 age = 5 warning = You.. weapon = 총
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- 82. class Killer extendsPerson { String warning; String weapon; Killer(String name, int age, String warning, String weapon) { this.name = name; this.age = age; this.warning = warning; this.weapon = weapon; } String getWeapon() { return weapon; } } Killer extends Person
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- 84. Person yotsuba =new Person(요츠바, 5); name = 요츠바 age = 5
- 85. Person Killer killerYotsuba =new Killer(요츠바, 5, You can tell me in hell., 총); name = 요츠바 age = 5 warning = You.. weapon = 총
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- 88. Person yotsuba =new Person(요츠바, 5); System.out.println(yotsuba.introduce()); Killer killerYotsuba = new Killer(요츠바, 5, You can tell me in hell., 총); System.out.println(killerYotsuba.introduce()); System.out.println(killerYotsuba.getWeapon()); Method Inheritacne
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- 101. public class Musicianextends Person { String instrument; Musician(String name, int age, String instrument) { this.name = name; this.age = age; this.instrument = instrument; } String play() { return instrument + 연주; } } Musician extends Person
- 102. Musician musicanYotsuba =new Musician(요츠바, 5, 피리); System.out.println(musicanYotsuba.introduce()); System.out.println(musicanYotsuba.play());
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- 111. class Person extendsObject { }
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- 223. class Person { String name; int age; String introduce() { } } Person Killer
- 224. class Killer extends Person { String warning; String weapon; String getWeapon() { } } 더
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- 231. Killer killerYotsuba = new Killer(요츠바, 5, You can tell me in hell., 총); name = 요츠바 age = 5 warning = You.. weapon = 총
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- 233. Killer killerYotsuba = new Killer(요츠바, 5, You can tell me in hell., 총); name = 요츠바 age = 5 warning = You.. weapon = 총
- 234. Killer Person Person yotsuba = new Killer(요츠바, 5, You can tell me in hell., 총);
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- 251. class Person { String name; int age; String introduce() { } } Person Killer
- 252. class Killer extends Person { String warning; String weapon; String getWeapon() { } } 일반화
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- 264. To p ic s
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- 269. public class Elevator{ Elevator() { ... } Elevator(int floor) { ... } void moveUp() { ... } void moveUp(int floor) { ... } void moveDown() { ... } void moveDown(int floor) { ... } }
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- 273. class Person { Stringname; int age; ... String introduce() { return 이름 : + name + , 나이 + age + 세; } } Person yotsuba = new Person(요츠바, 5); name = 요츠바 age = 5
- 274. this class Person String introduce() { return 이름 : + name + , 나이 + age + 세; } class class Object superclass String toString() { ... }
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- 278. class Person { Stringintroduce() { return 이름 : + name + , 나이 + age + 세; } } name = 요츠바 age = 5
- 279. this class Person String introduce() { return 이름 : + name + , 나이 + age + 세; } class class Object superclass String toString() { ... } yotsuba.introduce()
- 280. class Person { String introduce() { return 이름 : + name + , 나이 + age + 세; } } name = 요츠바 age = 5
- 281. this class Person String introduce() { return 이름 : + name + , 나이 + age + 세; } class class Object superclass String toString() { ... } yotsuba.toString()
- 282. class Killer extendsPerson { } class Person { String introduce() { return 이름 : + name + , 나이 + age + 세; } } Person yotsuba = new Killer(요츠바, 5, You can tell me in hell., 총); name = 요츠바 age = 5 warning = You.. weapon = 총
- 283. this class Person String introduce() { return 이름 : + name + , 나이 + age + 세; } class class Object superclass String toString() { ... } class Killer superclass
- 284. name = 요츠바 age= 5 warning = You.. weapon = 총
- 285. this class Person String introduce() { return 이름 : + name + , 나이 + age + 세; } class class Object superclass String toString() { ... } class Killer superclass yotsuba.introduce() class Killer extends Person { } class Person { String introduce() { return 이름 : + name + , 나이 + age + 세; } }
- 286. name = 요츠바 age= 5 warning = You.. weapon = 총
- 287. this class Person String introduce() { return 이름 : + name + , 나이 + age + 세; } class superclass String toString() { ... } class Killer superclass yotsuba.introduce() String introduce() { return ＂무기 : + weapon + , + 이름 : + name + , 나이 + age + 세; } class Killer extends Person { String introduce() { return ＂무기 : + weapon + , + 이름 : + name + , 나이 + age + 세; } } class Person { String introduce() { return 이름 : + name + , 나이 + age + 세; } } class Object
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- 308. public class Person{ String message() { return Message : [ + introduce() + ]; } String introduce() { return 이름: + name + , 나이: + age + 세; } } public class Killer extends Person { String introduce() { return ＂무기 : + weapon + , + 이름 : + name + , 나이 + age + 세; } } Quiz Person killerYotsuba = new Killer(요츠바, 5, You can tell me in hell., 총); killerYotsuba.message();
- 309. name = 요츠바 age= 5 warning = You.. weapon = 총
- 310. this class Person String message(){ return Message : [ + introduce() + ]; } String introduce() { return 이름 : + name + , 나이 + age + 세; } class superclass String toString() { ... } class Killer superclass String introduce() { return ＂무기 : + weapon + , + 이름 : + name + , 나이 + age + 세; } Person killerYotsuba = new Killer(요츠바, 5, You can tell me in hell., 총); killerYotsuba.message(); class Object this부터
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- 314. name = 요츠바 age= 5 warning = You.. weapon = 총
- 315. this class Person String message(){ return Message : [ + introduce() + ]; } String introduce() { return 이름 : + name + , 나이 + age + 세; } class superclass String toString() { ... } class Killer superclass String introduce() { return ＂무기 : + weapon + , + 이름 : + name + , 나이 + age + 세; } Person killerYotsuba = new Killer(요츠바, 5, You can tell me in hell., 총); killerYotsuba.message(); class Object introduce()
- 316. name = 요츠바 age= 5 warning = You.. weapon = 총
- 317. this class Person String message(){ return Message : [ + introduce() + ]; } String introduce() { return 이름 : + name + , 나이 + age + 세; } class superclass String toString() { ... } class Killer superclass String introduce() { return ＂무기 : + weapon + , + 이름 : + name + , 나이 + age + 세; } Person killerYotsuba = new Killer(요츠바, 5, You can tell me in hell., 총); killerYotsuba.message(); class Object introduce() this부터
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- 321. name = 요츠바 age= 5 warning = You.. weapon = 총
- 322. this class Person String message(){ return Message : [ + introduce() + ]; } String introduce() { return 이름 : + name + , 나이 + age + 세; } class superclass String toString() { ... } class Killer superclass String introduce() { return ＂무기 : + weapon + , + 이름 : + name + , 나이 + age + 세; } Person killerYotsuba = new Killer(요츠바, 5, You can tell me in hell., 총); killerYotsuba.message(); class Object introduce() this부터
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- 333. public class Person{ String introduce() { return 이름: + name + , 나이: + age + 세; } } public class Killer extends Person { String introduce() { return ＂무기 : + weapon + , + 이름 : + name + , 나이 + age + 세; } } Code Duplication
- 334. public class Person{ String introduce() { return 이름: + name + , 나이: + age + 세; } } public class Killer extends Person { String introduce() { return ＂무기 : + weapon + , + introduce(); } } Recursive Call Code Reuse
- 335. public class Person{ String introduce() { return 이름: + name + , 나이: + age + 세; } } public class Killer extends Person { String introduce() { return ＂무기 : + weapon + , + super.introduce(); } } super
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- 350. class Person { Person(){ this(사람, 1); } Person(String name, int age) { this.name = name; this.age= age; } }
- 351. class Killer extendsPerson { Killer(String name, int age, String warning, String weapon) { this.name = name; this.age = age; this.warning = warning; this.weapon = weapon; } } class Person { Person() { this(사람, 1); } Person(String name, int age) { this.name = name; this.age= age; } } Code Duplication
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- 353. class Killer extendsPerson { Killer(String name, int age, String warning, String weapon) { super(name, age); this.warning = warning; this.weapon = weapon; } } class Person { Person() { this(사람, 1); } Person(String name, int age) { this.name = name; this.age= age; } } Code Duplication
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- 358. class IronMan extends Person { } ?
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- 371. class IronMan { Person person; IronMan(Person person) { this.person = person; } } 합성Composition
- 372. IronMan ironMan = new IronMan(new Person(토니 스타크, 40)); IronMan ironYotsuba = new IronMan(new Killer(요츠바, 5, You can tell me in hell., 총));
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- 392. public class IronMan { Person person; IronMan(Person person) { this.person = person; } String introduce() { return person.introduce(); } } 위임Delegation
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