public String getValue(String name, String defaultValue) {
        return getValue(resolveOption(name), defaultValue);
    }
public String getValue ( String name , String defaultValue ) { return getValue ( resolveOption ( name ) , defaultValue ) ; }
Retrieve the first argument, if any, of an option.

@param name the name of the option
@param defaultValue the default value to be returned if the option
is not specified
@return the value of the argument if option is set, and has an argument,
otherwise {@code defaultValue}