KCJava Google Group

KCJava Meeting Reminder -- Wednesday November 11 at 6:30

javasiglea...@kcjava.org (Scott Nameth) — Mon, 09 Nov 2009 03:25:40 UT

Topic: VirtualBox: VirtualBox is a powerful x86 and AMD64/Intel64
virtualization
product for enterprise as well as home use.
Speaker: Fred Bloom
Fred Bloom has managed and mentored multiple teams of diverse technical,
skill-level and business backgrounds. He has successfully implemented
and delivered software and system architectures and applications. He is

Bloch on Generics (was: Re: Maps and trivia questions : java generics)

michael.1...@gmail.com (michael) — Tue, 03 Nov 2009 07:04:23 UT

No one had mentioned it, so I'll chime in with Josh Bloch's recent
addition to his (growing) list of "Effective Java" tips, specifically
referring to Generics. Apropos, & might be of interest to some -- but
doesn't address the *specific* issue at hand (*).

There's a video & a set of slides to review. A few puzzlers are thrown

Re: Maps and trivia questions : java generics

lukewpatter...@gmail.com (luke w patterson) — Fri, 30 Oct 2009 15:33:29 UT

It wasn't too flagrant, at least no one got gaftered :) :)
[link]

Re: [kcjava] Re: Maps and trivia questions : java generics

rheag...@gmail.com (Ryan McCullough) — Fri, 30 Oct 2009 04:47:38 UT

I don't know many technical ppl who smile when forced to repeat them
selves. I hope this doesn't reflect poorly on my upcoming performance
review.

In what way is this relevant to generic parametrization and further, a
collection containing keys of a specific class.

I could see why in a scenario where the collection contains an assortment of

Re: [kcjava] Re: Maps and trivia questions : java generics

david.mitch...@gmail.com (David Mitchell) — Fri, 30 Oct 2009 04:32:33 UT

Easy there!

At least put a smiley down when you threaten to brand with the jerk iron.

Here is a quote for those of you viewing on a dial-up email only account:

<quote>

Uniformly, methods of the Java Collections Framework (and the Google
Collections Library too) never restrict the types of their parameters except

Re: [kcjava] Re: Maps and trivia questions : java generics

rheag...@gmail.com (Ryan McCullough) — Fri, 30 Oct 2009 03:58:53 UT

Please para-phrase your opinion in the email thread, or be brandeds a hard
headed jerk. Not everyone here is able to view this link.
On Oct 29, 2009 10:25 PM, "Kevin Shekleton" <kevin.shekle...@gmail.com>
wrote:
Take a look at the accepted answer, which also has the most up votes.

Re: [kcjava] Re: Maps and trivia questions : java generics

kevin.shekle...@gmail.com (Kevin Shekleton) — Fri, 30 Oct 2009 03:25:28 UT

Take a look at the accepted answer, which also has the most up votes.

Re: [kcjava] Re: Maps and trivia questions : java generics

rheag...@gmail.com (Ryan McCullough) — Thu, 29 Oct 2009 22:32:18 UT

please summarize your opinion, that thing has 4 different points of view

Ryan McCullough
(816) 2000-816 - Home & Mobile

On Thu, Oct 29, 2009 at 5:14 PM, Kevin Shekleton

Re: [kcjava] Re: Maps and trivia questions : java generics

kevin.shekle...@gmail.com (Kevin Shekleton) — Thu, 29 Oct 2009 22:14:32 UT

This came up between a colleague and myself and here's StackOverflow to the
rescue:
[link]

Re: [kcjava] Re: Maps and trivia questions : java generics

rheag...@gmail.com (Ryan McCullough) — Thu, 29 Oct 2009 03:46:54 UT

I'm not really sure, but I'll bet that it is because the key compared by
memory address, making it completely unnecessary, and possibly excessive to
have a type definition. it might also save the compiler from needing to
perform type erasure. If you are iterating over a keyList, then I could see

Re: Maps and trivia questions : java generics

hanas...@gmail.com (hanasaki) — Thu, 29 Oct 2009 03:32:25 UT

Bingo. Your thoughts?

public boolean containsKey(Object o);
public V remove(Object o);
public boolean containsValue(Object o);
public V get(Object key)

public boolean containsKey(K o);
public V remove(K o);
public boolean containsValue(V o);
public V get(K key)

Re: [kcjava] Maps and trivia questions : java generics

rheag...@gmail.com (Ryan McCullough) — Wed, 28 Oct 2009 17:38:41 UT

Are u asking why the get method accepts arg of Object insted of
K? Please be more specific.

Below is the code from interface java.util.Map pulled from my favorite
IDE. Anyone have comments of interest on the method "get" in the
interface as it pertains to proper use of Generics? JDK 1.6

Re: Maps and trivia questions : java generics

hanas...@hanaden.com (hanasaki) — Wed, 28 Oct 2009 17:31:08 UT

actually...
get, containsKey and containsValue

Maps and trivia questions : java generics

hanas...@hanaden.com (hanasaki) — Wed, 28 Oct 2009 17:25:02 UT

Below is the code from interface java.util.Map pulled from my favorite
IDE. Anyone have comments of interest on the method "get" in the
interface as it pertains to proper use of Generics? JDK 1.6
I have an idea... Just bouncing it off the list blindly for a
confirmation / sanity check.
Thanks!
///////

Java job openings in KC

javasiglea...@kcjava.org (Scott Nameth) — Mon, 26 Oct 2009 01:52:47 UT

POWTEC is hiring for multiple long term positions at the USDA in Kansas City.
Details are on the website at:
[link]
Send resume to kcj...@powtec.com