单项选择题

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

A.Write Hello
B.Rubber Write Hello
C.编译失败
D.运行时抛出异常

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