To execute your code, you simply create a main method:
public static void main(String[] args) {
RDF rdf = new RDF();
rdf.create();
}
Your RDF seems to be in the RDF/JSON format which seems to be supported by Sesame 2.7, so you have to specify the RDFFormat.RDFJSON.
Alternatively, you could convert your file to some other, universally accepted format such as N-Triples. Have a look at http://rdf-translator.appspot.com/ and try to copy paste your sample json there. For input select RDF/JSON and for output N-Triples.