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utuyut |
54645 |
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08-90 |
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| 15:54 |
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ksiazczyk_grzego |
hi all :) |
| 15:54 |
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* sjmaple |
hello vJUGers |
| 15:54 |
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bklau |
hi from boston |
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Heartly4u |
Hey |
| 15:58 |
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shelajev |
hello people |
| 15:59 |
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| 16:00 |
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jttkim |
when are we starting -- now or in (more than) 1h time? |
| 16:00 |
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jttkim |
just checking that I'm not confused about time zone... |
| 16:00 |
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shelajev |
now :) |
| 16:00 |
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jttkim |
ok, good -- thanks. |
| 16:00 |
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| 16:01 |
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Heartly4u |
Is it started or suppose to start now ??? |
| 16:02 |
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ArslanZ |
hi all |
| 16:02 |
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shelajev |
it's on now, maybe a 30 sec delay in hangouts |
| 16:02 |
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| 16:02 |
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shelajev |
it is live |
| 16:02 |
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| 16:03 |
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jttkim |
;-) |
| 16:03 |
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| 16:03 |
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| 16:03 |
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shelajev |
refresh the page if the video: virtualjug.com/#live is not working ? |
| 16:04 |
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| 16:04 |
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| 16:04 |
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Tushar |
Hello All |
| 16:04 |
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shelajev |
speakers twitter handles if you want to ping then |
| 16:04 |
|
shelajev |
or thank them |
| 16:04 |
|
shelajev |
@RichardWarburto - Richard |
| 16:05 |
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shelajev |
@RaoulUK - Raoul-Gabriel |
| 16:05 |
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| 16:06 |
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| 16:06 |
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shelajev |
if there are any questions, please ask them here, we'll pass along to the speakers |
| 16:06 |
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| 16:07 |
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| 16:08 |
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| 16:08 |
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bklau |
Q: My 10th attempt to learn generics. Any good learning resource(s)? |
| 16:08 |
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| 16:08 |
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| 16:09 |
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sjmaple |
oh, we still have square brackets on the vJUG homepage :) |
| 16:09 |
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shelajev |
how are generics and co/contra-variance are related? are they? |
| 16:10 |
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| 16:12 |
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| 16:12 |
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gpeterso |
@shelajev yes they are related. I can't explain it and watch the presentation at the same time. |
| 16:13 |
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| 16:13 |
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ArslanZ |
Just node guys; the secondary speaker's volume is much lower than the primary |
| 16:13 |
|
ArslanZ |
note* |
| 16:14 |
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| 16:14 |
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| 16:14 |
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dnno |
is the session running yet? i only get "please stand by" sor far... |
| 16:14 |
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| 16:15 |
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ArslanZ |
yes, it started around 10mins ago. Try refreshing... |
| 16:15 |
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PM771 |
It IS running |
| 16:15 |
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gpeterso |
@shelajev wildcards are used to specify variance. |
| 16:15 |
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jttkim |
Java generics could be simpler if the erasures nonsense could be gotten rid of |
| 16:15 |
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| 16:16 |
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| 16:16 |
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PM771 |
@jitkim - Kill back compatibility? |
| 16:19 |
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shelajev |
javaagents to the rescue! you can retrofit everything! |
| 16:19 |
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sjmaple |
:) |
| 16:19 |
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jttkim |
yes. I understand that thas has to be done slowly / managedly, but 10 years should be sufficient to do that |
| 16:19 |
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sjmaple |
if only everyone used javaagents... omg can you imagine! |
| 16:21 |
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jttkim |
@PM771 as far as I understand the problem is in the bytecode, so backward compatibility issue can be solved by re-compiling |
| 16:21 |
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ArslanZ |
i agree with jttkim; maintaining backwards compatibility with archaic java versions is in my opinion unnecessary |
| 16:24 |
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sjmaple |
interesting discussion. One of the unwritten rules of new Java releases are that no re-compilation is necessary |
| 16:24 |
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HarmeetSingh |
great explanation |
| 16:25 |
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| 16:26 |
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jttkim |
seems to me that the "Object & ..." trick basically works around a problem caused by erasures |
| 16:26 |
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| 16:27 |
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| 16:28 |
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| 16:28 |
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EdMacall |
The Power Point slides are not readable, even in full screen mode. |
| 16:28 |
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HarmeetSingh |
yes |
| 16:28 |
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| 16:28 |
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sjmaple |
are you in highest quality? click the cog on the bottom right of the video and pick your quality |
| 16:29 |
|
sjmaple |
pick the highest you're offered |
| 16:29 |
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ArslanZ |
plenty readible for me |
| 16:30 |
|
EdMacall |
I am not able to choose any quality. Switching to viewing this from YouTube only reveals that I am receiving this in 144p, but not allowed to choose anything else. |
| 16:31 |
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EdMacall |
The source code is also blurred. |
| 16:31 |
|
EdMacall |
Even in full screen mode. |
| 16:31 |
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sjmaple |
wow, I can go up to 720p |
| 16:31 |
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ArslanZ |
i am on 720p |
| 16:31 |
|
sjmaple |
where are you located? |
| 16:32 |
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EdMacall |
My mistake. YouTube has changed the quality controls to be a menu within a menu |
| 16:32 |
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sjmaple |
ahh ok, phew :) |
| 16:34 |
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sjmaple |
it was a clone of a clone of a menu |
| 16:35 |
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| 16:40 |
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HarmeetSingh |
List<? extends Message> we also use List<T extends Message>, then what 's the difference betwwen two ? |
| 16:41 |
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| 16:43 |
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jttkim |
@HarmeetSingh I think you can use <T extends Message> only in a class declaration, not in a parameter declaration |
| 16:43 |
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HarmeetSingh |
@jttkim you sure about this ? |
| 16:45 |
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| 16:45 |
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| 16:46 |
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suni |
hi mikayel |
| 16:46 |
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jttkim |
@jHarmeetSingh pretty sure... the only way you can state something like "extends" in a method declaration is to declare the type parameter first |
| 16:46 |
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HarmeetSingh |
ok, that's cool |
| 16:46 |
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HarmeetSingh |
i will try that |
| 16:46 |
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| 16:47 |
|
suni |
hey friends..when did session start |
| 16:47 |
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jttkim |
i.e. public <T> m(List<T> list) { ... } |
| 16:47 |
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jttkim |
@suni 17:00 UK DST |
| 16:48 |
|
suni |
ok.. |
| 16:50 |
|
suni |
just now came to online... |
| 16:50 |
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jttkim |
@suni I think they'll post a recording of the session once it's finished (perhaps that's an automatic youtube feture even) |
| 16:51 |
|
suni |
@jttkim ...ok..thanks. |
| 16:51 |
|
bklau |
Generics are good "gotchas" interview questions :) |
| 16:54 |
|
sjmaple |
even though we're still live, the replay is here virtualjug.com/generics-past-present-and-future/ :) |
| 16:54 |
|
HarmeetSingh |
this is looks like primitive collection in java |
| 16:54 |
|
sjmaple |
Any final questions for Raoul and Richard? |
| 16:54 |
|
suni |
when we are starts to learning "generics" we are thinking..this is very light subject(no need to learn that much) |
| 16:54 |
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| 16:55 |
|
jttkim |
now -- what were those problems and advantages of erasures? |
| 16:55 |
|
jttkim |
specifically: what are the advantages??? |
| 16:55 |
|
suni |
but in real world generics place a major role |
| 16:55 |
|
suni |
@jttkim-what is erasures? |
| 16:56 |
|
bklau |
problem with generics are "edge" cases to address erasure |
| 16:56 |
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suni |
first i am listen this word..can you explain little bit |
| 16:56 |
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| 16:57 |
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jttkim |
@suni essentially, they mean that the generics aspect of a type is known only to the compiler, but not known to the runtime |
| 16:57 |
|
bklau |
Generics == source-level "training wheels" |
| 16:58 |
|
bklau |
Once, the bicycle is runining, the "training wheels" are removed! |
| 16:58 |
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ArslanZ |
@bklau, nice analogy lol |
| 16:59 |
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jttkim |
this was on one of the last slides but there was no discussion of that bullet point |
| 16:59 |
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| 17:00 |
|
bklau |
To be a generics "guru", you need a weekend job as a "contortionist" |
| 17:00 |
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sjmaple |
any final final questions? :) |
| 17:01 |
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| 17:04 |
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jttkim |
thanks to all... *applause* |
| 17:05 |
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HarmeetSingh |
what their tweeter id for follow ? |
| 17:05 |
|
Jigar |
Thanks, very good session!! |
| 17:05 |
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ArslanZ |
thank you guys, very useful session |
| 17:05 |
|
HarmeetSingh |
Really great session |
| 17:05 |
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| 17:05 |
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MarsYang |
Thanks.great session. |
| 17:05 |
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ArslanZ |
loved the conversation/pair based discussion |
| 17:06 |
|
ArslanZ |
kept it from being dry |
| 17:06 |
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jayhoffs |
Harmeet: @richardwarburto / @raouluk |
| 17:06 |
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HarmeetSingh |
thanks |
| 17:12 |
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| 17:19 |
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suni |
here any one is there |
| 17:20 |
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| 17:20 |
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suni |
here i dont know who is speaker? |
| 17:21 |
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| 17:22 |
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| 17:28 |
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| 17:29 |
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shelajev |
hey suni |
| 17:29 |
|
shelajev |
the speakers were Richard Warburton and Raoul-Gabriel Urma |
| 17:30 |
|
shelajev |
you can see more details here http://www.meetup.com/virtualJUG/events/225090074/ |
| 17:50 |
|
gpeterso |
Thank you - I really enjoyed it and am looking forward to seeing the slides posted! |
| 17:56 |
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| 19:04 |
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