Java is a operating system independent programming language, originally developed by Sun Microsystems, meanwhile merged to Oracle.
To install Java go to the download center of Oracle. If you want to develop for Java you need to install the JDK, otherwise you just have to install the JRE. I recommend to install it to
/opt/java as root.
You can use
galternatives (see here) to tell your system that there’s a JRE or a compiler. Point
javac to the binaries of your installation, e.g. in
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