Java used to be deeply embedded in OS X, but in recent versions of the OS it's an optional install. Here is how to check to see if it is installed, and how to disable or remove it.

Check the Enabled option to permit the latest Java Runtime version. Click on OK button to apply the setting changes. Click OK in Java Control Panel to confirm the changes.

If Java is not recognized as internal or external command, you need to make sure that the installation is not problematic and its path is recognized as system variables.