jena - how to use rdfcat from java code -

in jena api there class rdfcat ,it tool convert data file format ,it used commande line example , need execute tool inside java code , tried code failed .

public static void main(string[] args) {     rdfcat rdf=new rdfcat();      string[] t={"-x f:/foaf.owl -out ttl"};     rdf.main(t);      string string=rdf.getcheckedlanguage("owl");     system.out.println("************************************************************");     map<string,string> m=rdf.unabbreviate;     iterator iterator =m.keyset().iterator();     while(iterator.hasnext())system.out.println(iterator.next());     system.out.println("************************************************************");     system.out.println(string);  } 

there's nothing jena specific this. command line arguments supposed array of various arguments, you're passing one. is,

string[] t={"-x f:/foaf.owl -out ttl"}; 

is array one string member. if you're going call rdfcat's main, you'd need do:

string[] t={"-x", "f:/foaf.owl", "-out", "ttl"}; 

that said, seems kind of strange thing do. easily, more flexibly, load input model , write out in format want.