SCJP題庫第036題

public class Doubler{

     public static int doubleMe(Holder h){

        return h.getAmount() * 2;

     }

}

and:

public class Holder {

  int amount = 10;

  public void doubleAmount(){amount = Doubler.doubleMe(this);}

  public in getAmount(){return amount;}

  //more code here

}

Place the code framgmets in position to reduce the coupling between Doubler and Holder.

public class Doubler{ 

  public static int doubleMe( Place here h){

    return Place here * 2;

  }

}

public class Holder {

  int amount = 10;

  public void doubleAmount(){

    amount = Doubler.doubleMe( Place here );

  }

  public in getAmount(){return amount;}

  //more code here

}

void 

Holder

int

Doubler

h.getAmount()

h

this

amount

Ans:  int        h        amount

解說:
修改程式使得Doubler與Holder二個類別的耦合性降低 

Dobuler被改成不使用到Holder類別，導致Holder的變更將不影響到Doubler類別。