public static void main(String[] args) throws IOException, ClassNotFoundException {
        if(args.length < 1) {
            System.err.println("Használat:");
            System.err.println("  java " + Ex1CreateIndex.class.getName() + " <index-file> <szavak>");
            System.exit(-1);
        }

        File indexFile = new File(args[0]);
        Ex1CreateIndex idx = new Ex1CreateIndex(indexFile);

        Set<File> files = new HashSet<File>();

        for(int i = 0; i< args.length;i++) {
            if(i == 0)
                continue;
            String word = args[i];
            Map<File, Integer> a = idx.getOccurences(word);
            if(i == 1) {
                files.addAll(a.keySet());
            } else {
                Set<File> ofiles = a.keySet();
                Set<File> delete = new HashSet<>();

                for(File f : ofiles) {
                    boolean found = false;
                    for(File file2 : ofiles) {
                        if(f.getAbsolutePath().equals(file2.getAbsolutePath())) {
                            found = true;
                            break;
                        }
                    }
                    if(!found) {
                        delete.add(f);
                    }
                }
                files.removeAll(delete);
            }
            for(File file : files) {
                System.out.println(file.getAbsoluteFile());
            }
        }

        System.out.println("-----");

        for(int i = 0; i< args.length;i++) {
            if(i == 0)
                continue;
            String word = args[i];
            Map<File, Integer> a = idx.getOccurences(word);
            System.out.println(word + ": " + a.keySet());
        }
    }