【設計模式】之實例化建造者模式

 建造者模式可以將一個產品的內部表象與產品的生成過程分割開來，從而可以使一個建造過程生成具有不同的內部表象的產品對象。
1. com.cleversoft.designpatterns.builder2.PostalClert.java:

500)this.width=500" align=top border=0>package com.cleversoft.designpatterns.builder2;
500)this.width=500" align=top border=0>
public class PostalClert 500)this.width=500" border=0>{
    public void construct(LetterBuilder letterBuilder) 500)this.width=500" border=0>{
        letterBuilder.buildEnvelop();
        letterBuilder.buildStamp();
    }
}

2. com.cleversoft.designpatterns.builder2.LetterBuilder.java:

500)this.width=500" align=top border=0>package com.cleversoft.designpatterns.builder2;
500)this.width=500" align=top border=0>
public abstract class LetterBuilder 500)this.width=500" border=0>{
    public abstract void buildEnvelop();

    public abstract void buildStamp();

    public abstract Letter getLetter();
}

3. com.cleversoft.designpatterns.builder2.OrdinaryMailBuilder.java:

500)this.width=500" align=top border=0>package com.cleversoft.designpatterns.builder2;
500)this.width=500" align=top border=0>
public class OrdinaryMailBuilder extends LetterBuilder 500)this.width=500" border=0>{
    private Letter ordinaryMail = new OrdinaryMail();

    public void buildEnvelop() 500)this.width=500" border=0>{
        ordinaryMail.add("ordinaryEnvelop", 0.1);
    }

    public void buildStamp() 500)this.width=500" border=0>{
        ordinaryMail.add("ordinaryStamp", 1.0);
    }

    public Letter getLetter() 500)this.width=500" border=0>{
        return ordinaryMail;
    }

}

4. com.cleversoft.designpatterns.builder2.RegisteredLetterBuilder.java:

500)this.width=500" align=top border=0>package com.cleversoft.designpatterns.builder2;
500)this.width=500" align=top border=0>
public class RegisteredLetterBuilder extends LetterBuilder 500)this.width=500" border=0>{
    private Letter registeredLetter = new RegisteredLetter();

    public void buildEnvelop() 500)this.width=500" border=0>{
        registeredLetter.add("registeredEnvelop", 2.0);
    }

    public void buildStamp() 500)this.width=500" border=0>{
        registeredLetter.add("registeredStamp", 15.0);
    }

    public Letter getLetter() 500)this.width=500" border=0>{
        return registeredLetter;
    }
}

5. com.cleversoft.designpatterns.builder2.Letter.java:

500)this.width=500" align=top border=0>package com.cleversoft.designpatterns.builder2;
500)this.width=500" align=top border=0>
public interface Letter 500)this.width=500" border=0>{

    public abstract void add(String type, double price);

    public abstract void list();

}

6. com.cleversoft.designpatterns.builder2.OrdinaryMail.java:

500)this.width=500" align=top border=0>package com.cleversoft.designpatterns.builder2;
500)this.width=500" align=top border=0>
500)this.width=500" align=top border=0>import java.util.Enumeration;
500)this.width=500" align=top border=0>import java.util.Hashtable;
500)this.width=500" align=top border=0>
public class OrdinaryMail implements Letter 500)this.width=500" border=0>{
    Hashtable<String, Double> letter = new Hashtable<String, Double>();

    /**//*
     * (non-Javadoc)
     * 
     * @see com.cleversoft.designpatterns.builder2.ILetter#add(java.lang.String,
     *      double)
     */
    public void add(String type, double price) 500)this.width=500" border=0>{
        letter.put(type, price);
    }

    /**//*
     * (non-Javadoc)
     * 
     * @see com.cleversoft.designpatterns.builder2.ILetter#show()
     */
    public void list() 500)this.width=500" border=0>{
        System.out.println("Ordinary Letter List/n");
        Enumeration keys = letter.keys();
        while (keys.hasMoreElements()) 500)this.width=500" border=0>{
            String key = keys.nextElement().toString();
            String value = letter.get(key).toString();
            System.out.println(key + " " + value + "元");
        }

    }
}

7. com.cleversoft.designpatterns.builder2.RegisteredLetter.java:

500)this.width=500" align=top border=0>package com.cleversoft.designpatterns.builder2;
500)this.width=500" align=top border=0>
500)this.width=500" align=top border=0>import java.util.Enumeration;
500)this.width=500" align=top border=0>import java.util.Hashtable;
500)this.width=500" align=top border=0>
public class RegisteredLetter implements Letter 500)this.width=500" border=0>{
    Hashtable<String, Double> letter = new Hashtable<String, Double>();

    /**//*
     * (non-Javadoc)
     * 
     * @see com.cleversoft.designpatterns.builder2.ILetter#add(java.lang.String,
     *      double)
     */
    public void add(String type, double price) 500)this.width=500" border=0>{
        letter.put(type, price);
    }

    /**//*
     * (non-Javadoc)
     * 
     * @see com.cleversoft.designpatterns.builder2.ILetter#show()
     */
    public void list() 500)this.width=500" border=0>{
        System.out.println("Registered Letter List/n");
        Enumeration keys = letter.keys();
        while (keys.hasMoreElements()) 500)this.width=500" border=0>{
            String key = keys.nextElement().toString();
            String value = letter.get(key).toString();
            System.out.println(key + " " + value + "元");
        }

    }
}

8. com.cleversoft.designpatterns.builder2.Main.java:

500)this.width=500" align=top border=0>package com.cleversoft.designpatterns.builder2;
500)this.width=500" align=top border=0>
public class Main 500)this.width=500" border=0>{

    public static void main(String[] args) 500)this.width=500" border=0>{
        LetterBuilder lb = new OrdinaryMailBuilder();
        PostalClert pc = new PostalClert();
        pc.construct(lb);

        Letter l = lb.getLetter();
        l.list();
    }
}