Java is an object-oriented programming language, that appeared in 1995. The most recent version of the programming language is version 16\footnote{March 
2021}. In order to write Java programs, one needs to install the so-called \emph{Java Development Kit (JDK)}.\footnote{\url{https://www.oracle.com/java/technologies/javase-downloads.html}}
Java programs can be written independently from the operating system that one uses.