// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-Java
Document doc = new Document(dataDir + "TestFile.docx");
//Specify the number of columns with which the footnotes area is formatted.
doc.getFootnoteOptions().setColumns(3);
dataDir = dataDir + "TestFile_Out.doc";
// Save the document to disk.
doc.save(dataDir);