How to change the hostname in Ubuntu
How to change hostname in Ubuntu. There are three options: temporary until the first restart and permanent by changing the hostname file or using command hostnamectl
Git ignore file mode chmod changes
How to make Git to ignore file modified by chmod changes. Using core.fileMode git config.
How to fix Cannot change version of project facet Dynamic Web Module to 3.1 Error in Eclipse
How to fix Cannot change version of project facet Dynamic Web Module to 3.1 Error in Eclipse. 5 simple steps.
Raspberry Pi 3 first remote startup
How to connect remotely to Raspberry Pi 3 using ssh from Linux or MacOS or Putty from Windows.
How to convert object to / from JSON using Jackson
How to convert Java object to / from JSON string using Jackson library. Simple example including embedded object.
How to get CPU cores in Java
A system may contain multiple physical CPUs (central processing unit), and can contain one or more cores (processors). Also, each core can have multiple threads, usually 2. (Hyper-threading Technology from Intel CPUs).
