get a string system property . the system property key to retrieve is created by concatenating the package name of the submitted class with the submitted key . concode_field_sep Log LOG concode_field_sep Properties init concode_elem_sep int getInt concode_elem_sep int getInt concode_elem_sep String systemPropertyKey concode_elem_sep int toInt concode_elem_sep Properties load
String function ( Class < ? > arg0 , String arg1 , @ Nullable String arg2 ) { return System . getProperty ( systemPropertyKey ( arg0 , arg1 ) , arg2 ) ; }