returns true if and only if the system property with the specified key exists . concode_field_sep Pattern INTEGER_PATTERN concode_elem_sep org.slf4j.Logger logger concode_field_sep long getLong concode_elem_sep int getInt concode_elem_sep String get concode_elem_sep String get concode_elem_sep boolean getBoolean
boolean function ( String arg0 ) { return get ( arg0 ) != null ; }