デザインパターンとOCP

1: 
    package calculator;
 2: 3: 
    /**
 4: 
    * 計算機に実装する機能の抽象定義
 5: 
    */
 6: 
    public abstract class AbstractCalc {
 7: 8:     
    private int intX;
 9:     
    private int intY;
 10:     
    //属性値アクセサX
 11:     
    public void setParamX(int x){
 12:         
    this.intX =x;
 13:     }
14:     
    public int getParamX(){
 15:         
    return this.intX;
 16:     }
17:     
    //属性値アクセサY
 18:     
    public void setParamY(int y){
 19:         
    this.intY =y;
 20:     }
21:     
    public int getParamY(){
 22:         
    return this.intY;
 23:     }
24:     
    //機能を実行するメソッドの定義
 25:     
    public abstract int CalcExecute();
 26: }

1: 
    package calculator;
 2: 3: 
    /**
 4: 
    * たし算の機能
 5: 
    */
 6: 
    public class CalcPuls extends AbstractCalc {
 7: 8:     
    public int CalcExecute(){
 9:         
    return (this.getParamX()+this.getParamY());
 10:     }
11: }

1: 
    package calculator;
 2: 3: 
    /**
 4: 
    * 引き算の機能
 5: 
    */
 6: 
    public class CalcMinus extends AbstractCalc {
 7: 8:     
    public int CalcExecute(){
 9:         
    return (this.getParamX()-this.getParamY());
 10:     }
11: }

1: 
    package calculator;
 2: 3: 
    import java.util.ArrayList;
 4: 
    /**
 5: 
    * 計算機クラス
 6: 
    */
 7: 
    public class Calclator {
 8: 9:     
    private ArrayList operations =new ArrayList();
 10: 11:     
    public int getCountIndex(){
 12:         
    return operations.size();
 13:     }
14:     
    //機能の保持
 15:     
    public void addOperation(AbstractCalc calc){
 16:         operations.add(calc);
17:     }
18: 19:     
    //メソッドの実行
 20:     
    public int execute(int index){
 21: 22:         return ((AbstractCalc)operations.get(index)).CalcExecute();
 23:     }
24: }

1: 
    package calculator;
 2: 3: 
    /**
 4: 
    * 簡単 計算機の処理実行
 5: 
    */
 6: 
    public class ClientClass {
 7: 8:     
    public static void main(String[] args) {
 9: 10:         
    //***計算機能のインスタンス生成***/
 11:         CalcPuls puls =new CalcPuls();
 12:         
    //値をセット
 13:         puls.setParamX(5);
14:         puls.setParamY(6);
15:         CalcMinus minus =new CalcMinus();
 16:         minus.setParamX(8);
17:         minus.setParamY(4);
18: 19:         
    //計算機に機能を追加します。
 20:         Calclator calcuator =new Calclator();
 21:         calcuator.addOperation(puls);
22:         calcuator.addOperation(minus);
23: 24:         
    //保持した機能すべてを実行
 25:         
    for(int i=0;i<calcuator.getCountIndex();i++){
 26:             System.out.println(calcuator.execute(i));
27:         }
28:     }
29: }