// For complete examples and data files, please go to https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-Java
InputStream sourceStream = 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)
);
String sourcePassword = Utilities.sourcePassword;
List<String> targetPasswords = Arrays.asList(
Utilities.targetPassword,
Utilities.targetPassword,
Utilities.targetPassword
);
MultiComparer comparer = new MultiComparer();
ICompareResult result = comparer.compare(sourceStream, sourcePassword, targets, targetPasswords, new ComparisonSettings());
result.saveDocument(Utilities.outputFileName(extension));