现有：     class Pencil  {  public void write （String content）{     System.out.println （"Write"+content）；     }     }  class RubberPencil extends Pencil{     public void erase （String content）{     System.out.println （"Erase"+content）；     }     }  执行下列代码的结果是哪项？（）      Pencil pen=new RubberPencil（）；      pen.write （"Hello"）；      pen.erase （"Hello"）；    

• A、 Write Hello        Erase Hello
• B、 Erase Hello        Write Hello
• C、编译错误
• D、运行时抛出异常