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为AppInventor2开发拓展(Extension) · App Inventor 2 中文网
...只能运行于安卓设备上，对于iOS设备需要使用swift开发iOS版本的拓展。
环境配置
安装好 Java开发环境 以及 Ant编译环境，这里以Windows为例，供参考：
安装完JDK后配置环境变量 计算机（右键）→属性→高级系统设置→...
Convert a list of data frames into one data frame
...t2::autoplot(mb)+theme_bw()
R version 3.6.0 (2019-04-26)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 18.04.2 LTS
Matrix products: default
BLAS: /usr/lib/x86_64-linux-gnu/openblas/libblas.so.3
LAPACK: /usr/lib/x86_64-linux-gnu/libopenblasp-r0.2.20.so
packageVersion("plyr")
packa...
How can I see the request headers made by curl when sending a request to the server?
....211) port 80 (#0)
> HEAD / HTTP/1.1
> User-Agent: curl/7.16.3 (i686-pc-cygwin) libcurl/7.16.3 OpenSSL/0.9.8h zlib/1.2.3 libssh2/0.15-CVS
> Host: stackoverflow.com
> Accept: */*
> Testing: Test header so you see this works
>
< HTTP/1.0 200 OK
...
...
Practical uses for AtomicInteger
...em.out.println("Atomic: "+(System.currentTimeMillis() - start));
}
On my PC with Java 1.6 the atomic test runs in 3 seconds while the synchronized one runs in about 5.5 seconds. The problem here is that the operation to synchronize (notAtomic++) is really short. So the cost of the synchronization ...
What's the best mock framework for Java? [closed]
...ential for unit testing Android applications using native Java on the host PC (avoiding using the slow emulator)
– Jeff Axelrod
Jul 14 '11 at 18:08
...
Real world use of JMS/message queues? [closed]
...eir own database. In order to handle data consistency, we had implemented 2PC mechanism.
For this, we used JMS for exchange the messages between these systems i.e one acting as coordinator who will initiate the process by sending message on the queue and others will respond accordingly by sending ba...
How do you kill a Thread in Java?
...
If you are on a PC then its no problem but if you are developing a software for mobile (android i have experienced it) then you will get OutOfMemoryError
– AZ_
Jun 10 '11 at 14:09
...
Could not load file or assembly 'Newtonsoft.Json' or one of its dependencies. Manifest definition do
...ot the error also when getting the project by team foundation server to my pc.i add reference of newtonsoft to my solution.it did not work.then i install json.net (newtonsoft.json) through nuget package manager.Now it is working fine.
– Mohammad Sadiqur Rahman
...
Visual studio long compilation when replacing int with double
...o much more expensive to implement in microcode, and of course the current PC systems are built around chips descendent from the 80387 and 80486, which predate the standard.
So if I'm right, the increased time is because it involves adding a chunk of library code to the link, and linking is a big p...
Checking in packages from NuGet into version control?
...to be able to have packages pulled down as necessary to a CI server or dev PC, so that you can avoid bloating the source control repository with third party DLLs.
– GiddyUpHorsey
Feb 13 '11 at 3:05
...