How to handle empty parameters in a main method java call -

i have dynamic way of passing in parameters java main method call done via command line(cmd) runnable jar file. @ moment main() method takes 6 parameters , sets each 1 variable before calling method variables passed in.

what id way give user ability pass 5 or less paramters command line , have safely handle missed parameter setting null or empty string("") value.

for example, if ran command below, should know set missing parameters have not specified(clientname , outputfolder), empty string.

java -xmx1024m -jar mainapp.jar "summary" **<missing>** "2015-06-07" "https://12345.bp.com/bp/" "c:\\parameters.txt" **<missing>** 

here code have main method:

public static void main(string[] args) {         try {                            string dtype = args[0];             string clientname = args[1];             string cyclestring = args[2];             string mspsurl = args[3];             string inputfile = args[4];             string outputfolder = args[5];              system.out.println("**main parameters passed**");             for(string x : args) {                 system.out.println(x);             }              runlogic(dtype, clientname, cyclestring,                      mspsurl, inputfile, outputfolder);                   } catch(exception ex) {             ex.printstacktrace();         }     } 

any appreciated.

suppose example last 2 optional.

string dtype = args[0]; string clientname = args[1]; string cyclestring = args[2]; string mspsurl = args[3]; string inputfile = (args.length < 4 ? "default inputfile" : args[4]); string outputfolder = (args.length < 5 ? "default outputfolder" : args[5]);