https://www.random.org/ generates random numbers, that you can use for testing.
JMH is a Java harness for building, running, and analysing nano/micro/milli/macro benchmarks written in Java and other languages targeting the JVM.
Atlas is a wiki-like, git-managed authoring platform for creating books. http://chimera.labs.oreilly.com/books/1230000000065/ch01.html
apt-get remove allows to uninstall software packages for Debian and Ubuntu. Some software may still have configuration stored on your system. If you don’t have used
apt-get purge, the config files still resides on your Debian installation. This post illustrates how to remove these packages.
In JPA it is possible to create directly a new object from JPQL SELECT statement, instead of fetching the result list and mapping the attributes. The JPA supports the constructor expressions for that.
This post demonstrates a part of inheritance with JPA 2. Abstract entities (classes) can be used to query their concrete subclasses.
uptime gives a one line display of the following information. The current time, how long the system has been running, how many users are currently logged on, and the system load averages for the past 1, 5, and 15 minutes.
IntelliJ allows you to use the Darcula theme, that is in some case better, e.g. coding on a notebook to save power. It may be the taste, that this theme is desired. If you copy and paste code from IntelliJ it will be formatted with the Darcula theme. If you want a printer friendly theme, you can set the option for copying, to use another theme like Default.