Collection: add(E), remove(Object)

Question

Hello, all!
First of all, I guess very strange see interface collection with
add(E) and remove(Object)... Why is there such collision?
LinkedList<String> list = new LinkedList<String>();
Object o = null;
list.remove(o);NetBeans shows a warning for the last line: Expected type String, actual type Object.
Eclipse and java compiler do not point to it. So how can I understand this? Netbeans fixed remove(Object) to remove(E)?
Can you please help to understand the collision?

Answer 1

mfratto wrote:
The only warning I get in netbeans is to assign the return value, a boolean, to a new variable.I use netbeans 6.7. Probably, You use another version of netbeans from me, so you do not get the same warning.
[see screenshort of the netbeans warning|http://i055.radikal.ru/0907/b2/6203e7e22d79.jpg]
But what that warning is saying is that you declared the LinkedList to contain String objects, but you are trying to remove an Object (which is a parent of String). You can do that, it's just weird to do so. Why wouldn't you just pass a object, a String in this case, of the same type back into list.remove()?
Edited by: mfratto on Jul 23, 2009 5:42 PMwithout sense, I just would like to understand netbeans behavior and "collision" of add(E) and remove(Object) methods.
Edited by: aeuo on Jul 23, 2009 8:47 PM the screenshort was changed to more illustrative one