Java Custom Annotations Example
How to create Java Custom Annotation. A simple example of creating Annotations in Java and usage by calling the Reflection API.
How to execute shell command from Java
How to execute a shell command from Java using Runtime.getRuntime().exec() method.
How to generate UUID / GUID in Java
How to generate UUID / GUID in Java using java.util.UUID class, UUID.randomUUID() method.
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
How to check if file exists in Golang
How to check if a file exists in Golang using os.Stat method. A FileInfo describing the named file or an error is returned.
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