這道題目的答案是不是有問(wèn)題啊
具體的題目是這樣的:
Consider the following java code:
//in file Book.java
package com.bookstore;
public class Book
{
private String isbn;
public Book(){ isbn = "UNDEFINED_BOOK"; }
public String getIsbn(){ return isbn; }
public void setIsbn(String value){ this.isbn = value; }
}
//in file MusicCD.java
package com.bookstore;
public class MusicCD
{
private String isbn;
public MusicCD(){ isbn = "UNDEFINED_CD"; }
public String getIsbn(){ return isbn; }
public void setIsbn(String value){ this.isbn = value; }
}
Code for browse.jsp:


What is printed in the generated response of browse.jsp?
Select 1 correct option.
a.UNDEFINED_BOOK
b.UNDEFINED_CD
c.It will not compile
d.It will compile but will give an exception at request time.
它的答案說(shuō)是選C 說(shuō)不會(huì)通過(guò)編譯的 可是我個(gè)人感覺(jué)應(yīng)該是選D的 會(huì)通過(guò)編譯只是會(huì)拋出ClassCastException的 大家都怎么認(rèn)為啊? 高手能否為我講解一下 謝謝啊!
可是這兩個(gè)CLASS之間沒(méi)有任何 關(guān)系啊～～～