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Generics and Collections...simple problem needed help!

 
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how should i fix the return value of output just to make this code successfully compiled?
(it will throw NullPointerException but i just want it to compile)

thank!
 
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Originally posted by adam lui:


(it will throw NullPointerException but i just want it to compile)


I am not sure what you intend to do, but here are some points to ponder:

1. Your method has to return a List<E>, while it doesn't return anything.
2. If I presume that you return "output", it isn't valid if someone calls this program with say a List of Long. Though your method is recursive, it's also public and hence you must take into account all possible inputs.

Alternatively, you may make your code more specific, to make it compile:

 
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