java gets linux environment variables

In Linux environment, how to obtain environment variables in java program?

System.getenv('Variable name')

Note: getenv is all lowercase

Some people also said to use System.getProperty(System.env('Variable name')), but I tried it but it didn't work.

My personal guess for the specific reason is that System.env() obtains system-level environment variables, which are variables under /etc/profile

Under normal circumstances, we will write the environment variables we define to the current user's configuration file, in the ~/.profile file.

For more articles related to java obtaining linux environment variables, please pay attention to the PHP Chinese website!