// For complete examples and data files, please go to https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-Java
InputStream source = new FileInputStream(Utilities.sourcePath +sourceFile);
List<InputStream> targets = Arrays.<InputStream>asList(
new FileInputStream(Utilities.targetPath + targetFile),
new FileInputStream(Utilities.targetPath + targetFile_2),
new FileInputStream(Utilities.targetPath + targetFile_3)
);
MultiComparer comparer = new MultiComparer();
ICompareResult result = comparer.compare(source, targets, new ComparisonSettings());
result.saveDocument(Utilities.outputFileName(extension));