Optimize page: content/english/java/basic-comparison/java-document-comparison-groupdocs-metadata-source/_index.md - - Updated title and meta description to include primary and secondary keywords.

- Added Quick Answers section for AI-friendly snippets.  
- Integrated secondary keywords into headings and body (java compare multiple files, java compare password protected).  
- Expanded introduction, added “Why Use” and “What is” sections for richer context.  
- Inserted detailed FAQ and trust‑signal block at the end.  
- Enhanced readability with conversational tone, bullet points, and clear explanations while preserving all original code blocks, links, and shortcodes.

Author: muqarrab-aspose