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From: Joshua Cranmer <Pidgeot18@verizon.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: Why "lock" functionality is introduced for all the objects?
Date: Fri, 01 Jul 2011 19:05:13 -0700
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On 6/28/2011 10:12 PM, 
supercalifragilisticexpialadiamaticonormalizeringelimatisticantations wrote:
> If the list wasn't mutable there'd be no problem casting a
> List<Sub> to a List<Super>.

And then I'd complain because my program would be spending more time 
copying the values between immutable queues than actually doing work. As 
long as the language has the potential for mutable collections (which 
most people want for performance reasons), you have the potential for 
generics casting issues.

-- 
Beware of bugs in the above code; I have only proved it correct, not 
tried it. -- Donald E. Knuth