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Scala best way of turning a Collection into a Map-by-key?
...ements, this Scala code is about 20 times slower than the straight-forward Java approach (create HashMap with appropriate size, loop over list, put elements into map). For 5,000 elements, Scala ist about 8 times slower. The loop approach written in Scala is roughly 3 times faster than the toMap vari...
Sort a Map by values
I am relatively new to Java, and often find that I need to sort a Map<Key, Value> on the values.
58 Answers
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'\r': command not found - .bashrc / .bash_profile [duplicate]
I have windows, using Cygwin, trying to set JAVA_HOME permanently through my .bashrc file.
19 Answers
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How to convert a string Date to long millseconds
...tdated classes SimpleDateFormat and Date is a bit more of a mystery to me. java.time, the modern Java date and time API also known as JSR-310, is so much nicer to work with. You can use it on Android through the ThreeTenABP, see this question: How to use ThreeTenABP in Android Project.
For most pur...
Start/Stop and Restart Jenkins service on Windows
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To stop Jenkins
Please avoid shutting down the Java process or the Windows service. These are not usual commands. Use those only if your Jenkins is causing problems.
Use Jenkins' way to stop that protects from data loss.
http://[jenkins-server]/[command]
where [comma...
我们这里5元30M - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...30M在一次国际洽谈会上,一个韩国高管对一位中国运营商的年轻老总说:在我们大寒冥国,网络带宽都是20M起,不知贵国情况如何?场面一度陷入僵局。这 在一次国际洽谈会上,一个韩国高管对一位中国运营商的年轻老总说:在我们大...
冷科幻一则 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
冷科幻一则1 月 16 日的梦。感谢 xkcd 为人物造型提供的灵感。 逗笑了最想逗笑的那个人最有成就感了。1 月 16 日的梦。感谢 xkcd 为人物造型提供的灵感。
// 逗笑了最想逗笑的那个人最有成就感了。
冷科幻
GetClientRect、GetWindowRect区别 - C/C++ - 清泛网 - 专注C/C++及内核技术
GetClientRect、GetWindowRect区别前者是相对窗口本身的坐标（如0, 0, 400, 300），后者是相对整个屏幕的坐标（假设窗口左上角位置100,100，则窗口Rect：100, 100, 400, 300）。前者是相对窗口本身的坐标（如0, 0, 400, 300），后者是相对整个屏...
c/c++如何判断指针无效？如NULL,0xcccccccc,0xfeeefeee,野指针等 - C/C++ -...
...ccc,0xfeeefeee,野指针等c c++如何判断指针无效？不仅仅是NULL的判断，有时由于指针释放没有赋NULL，指针会变成野指针或诸如0xcccccccc,0xfeeefeee形式的无效指针，...c/c++如何判断指针无效？不仅仅是NULL的判断，有时由于指针释放没有...
/usr/lib64/gcc/ ... /bin/ld: cannot find -lxxx 踩坑记录 - C/C++ - 清泛网 - 专注C/C++及内核技术
...时依赖xxx模块，在确认依赖路径及依赖xxx so文件名均正确的前提下，编译仍然报错： usr lib64 gcc bin ld: cannot find -lxxx最后才发现，xxx目录生成的目 编译一个模块时依赖xxx模块，在确认依赖路径及依赖xxx.so文件名均正确的前...