help

[zhu yuanming]

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!

[Nadeem Khan]

Hey Zhu,
Please check K&B Errata topic and you will come to know that this question hasnt been framed properly!

[Jesper de Jong]

Welcome to JavaRanch.

Please use a meaningful subject line instead of "help" when you post a question.

[zhu yuanming]

ok,thank you for help.but where K&B Errata I can find?
[ March 13, 2008: Message edited by: zhu yuanming ]

[Jesper de Jong]

SCJP Sun Certified Programmer for Java 5 Study Guide - Errata 4/16/06

[zhu yuanming]

thank you very much.