부록. Class Diagram Code 변환 실전

이제 실전이다!

실제 패턴이 적용된 다음 클래스 다이어그램을 보고 각 클래스들의 코드들을 생각해보자.

그리고 나서, 생각한 코드와 어느 정도 일치하는지 코드를 확인하여 보자.

design pattern model 해석 실전

design pattern	diagram	code
Adapter		App 원본 접기 public class App {   public static void main(String[] args) {     Captain captain = new Captain(new BattleFishingBoat());     captain.move();     captain.fire();   } } BattleFishingBoat 원본 접기 public class BattleFishingBoat implements BattleShip {     private static final Logger LOGGER = LoggerFactory.getLogger(BattleFishingBoat.class);     private FishingBoat boat;     public BattleFishingBoat() {     boat = new FishingBoat();   }     @Override   public void fire() {     LOGGER.info("fire!");   }     @Override   public void move() {     boat.sail();   } } BattleShip 원본 접기 public interface BattleShip {     void fire();     void move();   } Captain 원본 접기 public class Captain implements BattleShip {     private BattleShip battleship;     public Captain() {     }     public Captain(BattleShip battleship) {     this.battleship = battleship;   }     public void setBattleship(BattleShip battleship) {     this.battleship = battleship;   }     @Override   public void fire() {     battleship.fire();   }     @Override   public void move() {     battleship.move();   }   } FishingBoat 원본 접기 public class FishingBoat {     private static final Logger LOGGER = LoggerFactory.getLogger(FishingBoat.class);     public void sail() {     LOGGER.info("The Boat is moving to that place");   }     public void fish() {     LOGGER.info("fishing ...");   }   }
Composite		App 원본 접기 public class App {     private static final Logger LOGGER = LoggerFactory.getLogger(App.class);   public static void main(String[] args) {     LOGGER.info("Message from the orcs: ");       LetterComposite orcMessage = new Messenger().messageFromOrcs();     orcMessage.print();       LOGGER.info("\n");       LOGGER.info("Message from the elves: ");       LetterComposite elfMessage = new Messenger().messageFromElves();     elfMessage.print();   } } Letter 원본 접기 public class Letter extends LetterComposite {     private char c;     public Letter(char c) {     this.c = c;   }     @Override   protected void printThisBefore() {     System.out.print(c);   }     @Override   protected void printThisAfter() {     // nop   } } LetterComposite 원본 접기 public abstract class LetterComposite {     private List<LetterComposite> children = new ArrayList<>();     public void add(LetterComposite letter) {     children.add(letter);   }     public int count() {     return children.size();   }     protected abstract void printThisBefore();     protected abstract void printThisAfter();     /**    * Print    */   public void print() {     printThisBefore();     for (LetterComposite letter : children) {       letter.print();     }     printThisAfter();   } } Messenger 원본 접기 public class Messenger {     LetterComposite messageFromOrcs() {       List<Word> words = new ArrayList<>();       words.add(new Word(Arrays.asList(new Letter('W'), new Letter('h'), new Letter('e'), new Letter(         'r'), new Letter('e'))));     words.add(new Word(Arrays.asList(new Letter('t'), new Letter('h'), new Letter('e'), new Letter(         'r'), new Letter('e'))));     words.add(new Word(Arrays.asList(new Letter('i'), new Letter('s'))));     words.add(new Word(Arrays.asList(new Letter('a'))));     words.add(new Word(Arrays.asList(new Letter('w'), new Letter('h'), new Letter('i'), new Letter(         'p'))));     words.add(new Word(Arrays.asList(new Letter('t'), new Letter('h'), new Letter('e'), new Letter(         'r'), new Letter('e'))));     words.add(new Word(Arrays.asList(new Letter('i'), new Letter('s'))));     words.add(new Word(Arrays.asList(new Letter('a'))));     words.add(new Word(Arrays.asList(new Letter('w'), new Letter('a'), new Letter('y'))));       return new Sentence(words);     }     LetterComposite messageFromElves() {       List<Word> words = new ArrayList<>();       words.add(new Word(Arrays.asList(new Letter('M'), new Letter('u'), new Letter('c'), new Letter(         'h'))));     words.add(new Word(Arrays.asList(new Letter('w'), new Letter('i'), new Letter('n'), new Letter(         'd'))));     words.add(new Word(Arrays.asList(new Letter('p'), new Letter('o'), new Letter('u'), new Letter(         'r'), new Letter('s'))));     words.add(new Word(Arrays.asList(new Letter('f'), new Letter('r'), new Letter('o'), new Letter(         'm'))));     words.add(new Word(Arrays.asList(new Letter('y'), new Letter('o'), new Letter('u'), new Letter(         'r'))));     words.add(new Word(Arrays.asList(new Letter('m'), new Letter('o'), new Letter('u'), new Letter(         't'), new Letter('h'))));       return new Sentence(words);     }   } Sentence 원본 접기 public class Sentence extends LetterComposite {     /**    * Constructor    */   public Sentence(List<Word> words) {     for (Word w : words) {       this.add(w);     }   }     @Override   protected void printThisBefore() {     // nop   }     @Override   protected void printThisAfter() {     System.out.print(".");   } } Word 원본 접기 public class Word extends LetterComposite {     /**    * Constructor    */   public Word(List<Letter> letters) {     for (Letter l : letters) {       this.add(l);     }   }     @Override   protected void printThisBefore() {     System.out.print(" ");   }     @Override   protected void printThisAfter() {     // nop   } }
Decorator		App 원본 접기 public class App {     private static final Logger LOGGER = LoggerFactory.getLogger(App.class);     public static void main(String[] args) {       // simple troll     LOGGER.info("A simple looking troll approaches.");     Troll troll = new SimpleTroll();     troll.attack();     troll.fleeBattle();     LOGGER.info("Simple troll power {}.\n", troll.getAttackPower());       // change the behavior of the simple troll by adding a decorator     LOGGER.info("A troll with huge club surprises you.");     Troll clubbed = new ClubbedTroll(troll);     clubbed.attack();     clubbed.fleeBattle();     LOGGER.info("Clubbed troll power {}.\n", clubbed.getAttackPower());   } } ClubbedTroll 원본 접기 public class ClubbedTroll extends TrollDecorator {     private static final Logger LOGGER = LoggerFactory.getLogger(ClubbedTroll.class);     public ClubbedTroll(Troll decorated) {     super(decorated);   }     @Override   public void attack() {     super.attack();     LOGGER.info("The troll swings at you with a club!");   }     @Override   public int getAttackPower() {     return super.getAttackPower() + 10;   } } SimpleTroll 원본 접기 public class SimpleTroll implements Troll {     private static final Logger LOGGER = LoggerFactory.getLogger(SimpleTroll.class);     @Override   public void attack() {     LOGGER.info("The troll tries to grab you!");   }     @Override   public int getAttackPower() {     return 10;   }     @Override   public void fleeBattle() {     LOGGER.info("The troll shrieks in horror and runs away!");   } } Troll 원본 접기 public interface Troll {     void attack();     int getAttackPower();     void fleeBattle();   } TrollDecorator 원본 접기 public class TrollDecorator implements Troll {     private Troll decorated;     public TrollDecorator(Troll decorated) {     this.decorated = decorated;   }     @Override   public void attack() {     decorated.attack();   }     @Override   public int getAttackPower() {     return decorated.getAttackPower();   }     @Override   public void fleeBattle() {     decorated.fleeBattle();   } }

같이 보기

2019/02/19 - [Dev. 객체지향개발/디자인패턴] - 부록. design pattern과 class diagram

2019/02/19 - [Dev. 객체지향개발/디자인패턴] - 부록. Class Diagram 구성 요소

2019/02/19 - [Dev. 객체지향개발/디자인패턴] - 부록. Class Diagram Code 변환 연습

References...

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"Unified Modeling Language". wikipedia.org. 2019-01-29.

"UML Class Diagrams Reference". uml-diaframs.org. 2019-01-29.

"UML". namu.wiki. 2019-01-29.

"JAVA 객체지향 디자인 패턴", 한빛미디어

"[UML] Class Diagram 클래스 다이어그램". tistory.com. 2019-01-30.

"UML: 클래스 다이어그램과 소스코드 매핑". nextree.co.kr. 2019-01-30.