true if a specific string is present in the list of arguments from the command line or if an attribute with that name (and any value) has been defined
the value for a given attribute
attribute names and values are defined in a positional way where an attribute name is always succeeded
with an attribute value. For example:
name1 value1 name2 value2
values can also be retrieved from system properties set with the regular jvm syntax -Dname=value
Command-line arguments