The default-java folder is a symbolic link to the actual location of the JDK install on Ubuntu. When you reference the JDK install location in applications or in environment variables such as ...

The Java JDK (Java Development Kit) is a software development environment that creates Java applications.

I recently read in a book on a Java-based technology that one can determine if the JDK is installed by running java -version and looking for the the Strings "Client" or "Server" in the output of ...