How to make a JAVA call in Linux shorter?

Question

linux

I downloaded JDK 11 to a Linux server, and now to run the program I write:
/usr/local/JDK/bin/javac ./Programm.java
/usr/local/JDK/bin/java Programm
How to make it possible to write without /usr/local/JDK/bin/, that is, just javac and java ?

Answer 1

Use the utility update-java-alternativesto set your Java as default.
Set java version as default (needs root permissions):
askubuntu

Answer 2

How to make it possible to write without /usr/local/JDK/bin/, that is, just javac and java?

By adding /usr/local/JDK/bin to PATH in some .bash_profile:
PATH="/usr/local/JDK/bin:$PATH"