템플릿 메소드 패턴

1 개요

template method pattern

템플릿 메소드 패턴

• 구체적인 것은 하위클래스에서 처리하도록 하는 구조
• 어떤 알고리즘에 대한 큰 틀이 결정된 상태에서 구체적인 설계를 서브클래스에 맡기는 디자인 패턴

 

2 예제

abstract class Game {
 
    protected int playersCount;
    abstract void initializeGame();
    abstract void makePlay(int player);
    abstract boolean endOfGame();
    abstract void printWinner();
 
    /* A template method : */
    public final void playOneGame(int playersCount) {
        this.playersCount = playersCount;
        initializeGame();
        int j = 0;
        while (!endOfGame()) {
            makePlay(j);
            j = (j + 1) % playersCount;
        }
        printWinner();
    }
}
 
//Now we can extend this class in order 
//to implement actual games:
 
class Monopoly extends Game {
 
    /* Implementation of necessary concrete methods */
    void initializeGame() {
        // Initialize players
        // Initialize money
    }
    void makePlay(int player) {
        // Process one turn of player
    }
    boolean endOfGame() {
        // Return true if game is over 
        // according to Monopoly rules
    }
    void printWinner() {
        // Display who won
    }
    /* Specific declarations for the Monopoly game. */
 
    // ...
}
 
class Chess extends Game {
 
    /* Implementation of necessary concrete methods */
    void initializeGame() {
        // Initialize players
        // Put the pieces on the board
    }
    void makePlay(int player) {
        // Process a turn for the player
    }
    boolean endOfGame() {
        // Return true if in Checkmate or 
        // Stalemate has been reached
    }
    void printWinner() {
        // Display the winning player
    }
    /* Specific declarations for the chess game. */
 
    // ...
}

3 같이 보기

• 추상클래스, 구체클래스
• 상속
• 메소드 오버라이딩
• GRASP
• Adapter 패턴
• 디자인 패턴
• 템플릿

4 참고 자료

• http://en.wikipedia.org/wiki/Template_method_pattern