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help

 
Greenhorn
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Given a method declared as:

public static <E extends Number> List<? super E> process(List<E> nums)
A programmer wants to use this method like this:

//INSERT DECLARATION HERE
output = process(input);
which pairs of declaration could be placed at//INSERT DECLARATIONS HERE to allow the code to compile?(Choose all that apply.)
A. ArrayList<Integer> input = null;
ArrayList<Integer> output = null;
B. ArrayList<Integer> input = null;
List<Integer> input = null;
c. ArrayList<Integer> input = null;
List<Number> output = null;
D. List<Number> input = null;
ArrayList<Integer> output = null;
E. List<Number> input = null;
List<Number> output = null;
F. List<Integer> input = null;
List<Integer> output = null;
G. None of the above.
Which answer is true and Why? the More particular,the better.

Thanks very much!
 
Ranch Hand
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Hey Zhu,
Please check K&B Errata topic and you will come to know that this question hasnt been framed properly!
 
Java Cowboy
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88
Android Scala IntelliJ IDE Spring Java
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Welcome to JavaRanch.

Please use a meaningful subject line instead of "help" when you post a question.
 
zhu yuanming
Greenhorn
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ok,thank you for help.but where K&B Errata I can find?
[ March 13, 2008: Message edited by: zhu yuanming ]
 
Jesper de Jong
Java Cowboy
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SCJP Sun Certified Programmer for Java 5 Study Guide - Errata 4/16/06
 
zhu yuanming
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thank you very much.
 
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