private List<SubsetSizeEntry> writeEntriedTo(File file) throws IOException { BufferedWriter writer = new BufferedWriter(new FileWriter(file)); List<SubsetSizeEntry> entries = Arrays.asList(new SubsetSizeEntry(1), new SubsetSizeEntry(2), new SubsetSizeEntry(3)); for (SubsetSizeEntry entry : entries) { writer.append(entry.dump()); } writer.close(); return entries; }