Joshua Bloch
@joshbloch
Followers
68,500
Following
204
Media
1,480
Statuses
17,037
Effective Java author, API Designer, CMU Prof, Swell guy, @joshbloch @mastodon .social
Silicon Valley
Joined July 2009
Don't wanna be here?
Send us removal request.
Explore trending content on Musk Viewer
Kendrick
• 686182 Tweets
Rio Grande do Sul
• 271835 Tweets
Madonna
• 183773 Tweets
Nicki
• 107698 Tweets
Ole Miss
• 101365 Tweets
Sony
• 92446 Tweets
DAVI NO PODPAH
• 88694 Tweets
Porto Alegre
• 75203 Tweets
Star Wars
• 71973 Tweets
Hope Hicks
• 59399 Tweets
#David69
• 48549 Tweets
スパコミ
• 41460 Tweets
みどりの日
• 35302 Tweets
Mark Hamill
• 32025 Tweets
Keyshia
• 23454 Tweets
Luton
• 22274 Tweets
#TheAmazingDigitalCircus
• 20774 Tweets
Quintana
• 17567 Tweets
Verstappen
• 17408 Tweets
Getafe
• 12066 Tweets
Lando
• 11538 Tweets
Thiago Silva
• 11379 Tweets
Pomni
• 11175 Tweets
Benedetti
• 10820 Tweets
المعيوف
• 10135 Tweets
@FoxNews
@jerrykuch
You forgot:
* Must be a complete waste of tax dollars
* Must accomplish nothing useful
41
246
2K
OH: "British Python programmers be like 'import math as maths.'"
15
139
1K
I am elated to announce that the Supreme Court ruled today that API reimplementation is fair use. This brings a ten year odyssey to an end. I'll have more to say later when I've had time to read the opinion.
17
239
1K
Today I want to tweet about something serious: colorectal cancer. March is colorectal cancer awareness month, but that’s not why I’m tweeting today. After procrastinating 10 years, I finally got my first colonoscopy this January, at age 60. Turns out I should have done it sooner.
83
99
970
I just sent the final pdf for Effective Java, Third Edition off to be printed. I didn't sleep all that much in the past few days ;)
50
228
956
Thanks so much! I do intend to update the book, but first, I plan to write an API Design book.
For me it is the best Java book I’ve ever read so far by
@joshbloch
.
If you a Java developer than I highly recommend reading it 🔥
I hope there will be a new update soon 🤞
4
6
67
51
62
881
I'm (still) hard at work revising Effective Java. For the next week, Pearson is offering 40% off on preorders
50
480
853
Hot news! Effective Java third edition source code is finally online. Sorry it took me so long.
16
267
755
In a corporate blog yesterday, Oracle attacked 83 computer scientists (including 13 Turing Award winners) who signed an amicus brief defending our right to reimplement APIs, on the grounds that some of us accepted research grants from Google.
22
412
707
Funny how incompetence and arrogance are positively correlated.
7
344
683
This is Donald Knuth's sole tweet:
4
298
648
If you do not remember Jon Bentley's 1985 "Bumpersticker Computer Science" (perhaps because you never read it) drop whatever you're doing and read it now.
15
221
604
I recently stumbled on this blog post again. You should read it once a decade whether you need to or not.
18
223
588
This is your annual reminder that Math.abs(Integer.MIN_VALUE) is negative
15
66
515
Proud to be one of 83 computer scientists encouraging the Supreme Court to preserve our right to implement each others' APIs
18
132
506
This is your annual reminder that Integer.MAX_VALUE is prime
10
126
470
@jerrykuch
@shipilev
@AmbientLion
Does anyone actually use LinkedList? I wrote it, and I never use it.
26
294
465
My mom, Renée Bloch (née Spira), passed away this week in Acton, Massachusetts. She was born in Antwerp, Belgium in 1932. This picture was taken by my dad at our home in 1986. (That's me on the left.)
79
5
468
Sorry to interrupt the fun, but I'm deeply saddened to hear that Fred Brooks has passed away. He was a great man whose impact on our industry is incalculable. I'm forever indebted to him for his support in the fight for the right to reimplement APIs.
1
164
465
Come to your own conclusions.
10
84
402
I am happy to report that I'm home and feeling great, a mere two days after surgery! Thanks again to
@AaronDawesMD
and his team, and all of the other wonderful people at
@StanfordHealth
.
18
4
459
This is your annual reminder that Integer.MAX_VALUE (2³¹-1) is prime. It is the eighth Mersenne prime, discovered by Leonhard Euler in 1772.
2
74
426
Coming soon (this Wednesday!) to a Supreme Court near you, the case that could determine whether we still have the right to reimplement each others' APIs.
13
173
419
RIP Niklaus Wirth. If you programmed in the '80s, you almost certainly know Pascal (which is his language).
We lost a titan of programming languages, programming methodology, software engineering and hardware design. Niklaus Wirth passed away on the first of January. We mourn a pioneer, colleague, mentor and friend.
152
2K
5K
14
65
416
It is likely that I could have saved myself from all of this if I’d had regular colonoscopies starting when I was 50. If you’re 50 or over and haven’t had a colonoscopy yet, PLEASE do yourself and your loved ones a favor, and schedule one soon.
56
30
388
@g1l3sp
83 of us computer scientists and engineers, including 14 Turing Award winners, did our best to help them understand APIs and software ecosystems.
5
65
365
Bill Shannon passed away yesterday. He was a great engineer and a great guy. He was Sun Employee 11, known for his work on Unix and Java EE.
He did not suffer fools gladly. R.I.P Bill, and condolences to his family.
18
51
365
Sadly, Oracle v. Google is back in play. For the record, we have ALWAYS reimplemented each others' APIs freely. If this ruling stands, it could do enormous harm to our profession.
24
339
358
Is it true that if Elon Musk accidentally breaks Twitter within 90 days, Amex Purchase Protection will reimburse his $44B?
10
20
355
For the record, we've ALWAYS been free to reimplement each others' APIs without the consent of their creators.
10
349
335
I am happy to report that I now have a paper copy of my own book (Effective Java, Third Edition)🙂
20
33
336
I am alive and feeling remarkably well, all things considered. Thank you
@AaronDawesMD
and
@StanfordHealth
. These folks are consummate professionals.
22
4
334
By request, here are the slides for the Effective Java, Third Edition talk that I gave at NY JavaSIG
4
171
332
I am thrilled to announce that the Supreme Court has agreed to hear the case that addresses the crucial question of whether we still have the right to reimplement each others' APIs.
4
87
319
Effective Java is banned in Ohio prisons! I am not making this up. Thanks to
@Cidmonster
and the
@MarshallProj
for their fine investigative reporting.
20
106
318
As I keep saying, Trump has largely succeeded in his bid to make America hate again. This instance is particularly offensive.
12
189
271
Here's a picture of me working on the first Effective Java talk after the book was released at JavaOne (2001). I'm at my sister's house in Acton, MA, with brother Dan and son Tim. The talk was at Softpro Books in Burlington. My dad took the picture.
9
8
289
This one slipped right by me: Oracle will no longer allow any of its "Long Term Support" (LTS) JDKs to be used for free in production. I suspect that this will make them among the least popular JDKs of all time, and perhaps irrelevant. Am I missing something?
34
292
288
This mouse pad is old. There are few if any like it. It is my daily driver.
19
38
285
I'm happy to announce that I'll be returning to CMU this "spring" (January) to teach two courses with Charlie Garrod: "API Design and Implementation" and "Principles of Software System Construction"
7
33
283
This is nonsense. For example, Doug Lea—who is in in no small measure responsible for Java's success—accepted one small grant from Google fourteen years ago, and promptly doled it out to deserving undergrads who were testing java.util.concurrent. Have you no shame, Oracle?
3
52
276
As you may know, elder son Tim now works for AMD. He suggested that we call his apartment the house of the Ryzen son.
10
4
271
Proud to be one of 78 computer scientists encouraging the Supreme Court to preserve our right to implement each others' APIs
5
85
267
This should be taken seriously. I know of no one more qualified to speak on this topic than Geoff.
18
96
256
Under no circumstances will I pay Twitter for a blue check. Therefore, after April 1, you know with certainty that any tweet with a blue check that claims to be me is fraudulent. Going forward, the 𝙖𝙗𝙨𝙚𝙣𝙘𝙚 of a blue check may provide some assurance that a tweet is genuine.
11
23
255
This is your annual reminder that Integer.MAX_VALUE is prime.
4
25
249
William Chargin poked a wee hole in Java's type system. This program compiles cleanly but throws ClassCastException at runtime:
class Main {
public static <T extends String & Runnable> void main(T[] args) {
args[0].run();
}
}
9
118
248
This is your annual reminder that Double.MIN_VALUE is positive
10
80
249
A fascinating case study on Netflix's transition from blocking multithreaded to nonblocking async architecture
4
158
246
Sacha Baron Cohen still has it. Watch this (from "Who is America").
14
116
239
These cubes are neither moving nor expanding. I, for one, am flabberasted.
13
66
237
Effective Java, Third Ed. preorder from Informit at 40% off, with free US shipping (promo code PREORDER) 😊
24
114
238
This is the best "neon spreading" style illusion I've ever seen.
This is fascinating & shows how weak colour information can be on a photo for the brain to fill in the gaps and "colourise" it for you. It's a black & white photo, but overlaid with a thin grid of coloured lines. They're enough to trick your mind into seeing a full colour image
244
4K
16K
3
68
236
The circles are not moving, expanding, or contracting, but you knew that.
7
45
231
Google has asked the Supreme Court to review the Federal Circuit's opinions that APIs are copyrightable, and that reimplementing APIs doesn't constitute fair use. The outcome of this case is critical to the future of our profession.
3
203
226
Hmm... Looks like Twitter is having difficulty hiring competent programmers.
To address extreme levels of data scraping & system manipulation, we’ve applied the following temporary limits:
- Verified accounts are limited to reading 6000 posts/day
- Unverified accounts to 600 posts/day
- New unverified accounts to 300/day
192K
107K
447K
21
27
229
Retweet this until it breaks. Then retweet it again. We need this all over the Internet now.
11
835
207
We depend on the right to reimplement each others' APIs, and we are truly afraid that your irresponsible lawsuit may deprive us of that right, which we've enjoyed throughout our long careers.
2
43
225
It looks like JavaScript is having a hard time finding a date. So apparently hyphen-separated dates denote UTC, slash-separated dates denote local time, and integers denote local time but with a zero-indexed month. Because of course they do. (HT Willow Chargin.)
15
34
222
Yeah, JavaScript does this. Because of course it does.
Что не смеетесь-то? Не смешно? Не поняли, да?
Это JavaScript!
14
70
626
9
58
221
This is your annual reminder that Integer.MIN_VALUE == -Integer.MIN_VALUE
6
29
220
Here are just a few of the books written by the signatories of the "Freedom to Reimplement APIs" brief.
4
107
212
R.I.P. Bob "crazybob" Lee. His killing was tragic, senseless, and incomprehensible (to me). He was only 43 years old, and so full of life. He was a dear, dear friend. My heart goes out to Krista and the kids.
11
27
217
"There are two ways of constructing a software design: One way is to make it so simple that there are obviously no deficiencies and the other way is to make it so complicated that there are no obvious deficiencies."—C.A.R. Hoare, 1980 Turing Award Lecture
1
86
212
We are not Google shills. We are scientists and engineers. Some of us laid the theoretical groundwork for the profession, some designed the computers you grew up on, and some wrote the software you use every day.
3
21
207
Just sent final manuscript off to AW for final proofreading. Total 90 items.
#EffectiveJava3e
9
42
204
Here's my QCon talk, "Effective Java, Third Edition - Keepin' it Effective," in case you want a little taste of what's new in the third edition.
2
65
195
I tweeted this yesterday, but for some reason it flew under the radar☺ Consider this program: It compiles w/o error and throws ClassCastExc
10
110
188
And the award for "Most Legally Encumbered Hello World Program" goes to Oracle for
http://goo.gl/gpWFR
0
1K
184
I believe Twitter's rebranding necessitates some new nomenclature. I have a modest proposal. The verb "tweet" shall henceforth be replaced by "Xcrete." What were once "tweets" are now "Xcreta."
9
26
180
To understand the tremendous harm caused by state media, you must watch this brilliant edit of Fox News by the Washington Post video team.
6
85
177
Maybe leave it in the ground?
5
29
170
This is your annual reminder that Integer.MIN_VALUE == -Integer.MIN_VALUE == Math.abs(Integer.MIN_VALUE)
4
57
164
Kodachrome is magic. This slide of my father, me, and my brother Dan, was taken in 1962. It lay in a cardboard box for ~58 years, and I scanned it this week. I did not restore it in any way.
8
5
160
It goes without saying that this sort of speech is extraordinarily dangerous.
‼️
@BrianKarem
: Do you commit to making sure there is a peaceful transfer of power?
@realDonaldTrump
: We're going to have to see what happens....Get rid of the ballots, there won’t be a transfer, they’ll be a continuation.
Words of a wannabe dictator.🤬
1K
5K
11K
10
61
147
I am proud to be one of 54 computer scientists reminding the court that we've always had the freedom to reimplement each other's interfaces, and that the profession and the public thrive under this regime.
2
20
158
I don't usually say this sort of thing, but that was a stunningly good victory speech by Joe Biden. Kudos to all of those involved in putting it together.
0
4
156
A year ago today I was operated on for 5½ hours to remove a colorectal tumor. The operation was a success, and so far there’s no sign of a recurrence (thanks,
@AaronDawesMD
and
@StanfordHealth
!), but I'm not out of the woods yet.
9
3
156
Not to brag, but this was my first day home from the hospital (and no, I won't be boring you with this sort of thing every day).
5
0
152
@vzverovich
This reminds me of jokes from a bygone era wherein southern states banned integrated circuits and mixed drinks.
2
4
151
@JaneMayerNYer
@buzz
I would love to see this, preferably including his grades. I would cheerfully trade my transcript for his.
4
13
135
Twuzzler: What does this program print? Now run it, and explain:
class Puzzle {
public static void main(String[] args) {
System.out.println(Boolean.getBoolean("true"));
}
}
35
46
146
In his memory, you should get out your copy of 𝘛𝘩𝘦 𝘔𝘺𝘵𝘩𝘪𝘤𝘢𝘭 𝘔𝘢𝘯 𝘔𝘰𝘯𝘵𝘩 and reread it. It's as true today as the the day it was written (in 1975).
8
25
146
Special SUPER-SECRET sale on Effective Java, Third Edition at informit! Save 35% + free US shipping on book or eBook with coupon code BLOCH991 (case sensitive)
9
61
145