Creating password protected ZIP file using TrueZip

 try {  
     final TConfig config = TConfig.get();  
     // Request encryption in archive files.  
     config.setOutputPreferences(config.getOutputPreferences()  
         .or(BitField.of(FsOutputOption.ENCRYPT)));  
     // Configure archive detector with custom key management for ZIP files.  
     config.setArchiveDetector(newArchiveDetector1("zip", "password"));  
     // Setup file paths.  
     TFile src = new TFile("file1");  
     TFile dst = new TFile("file2");  
     if (dst.isArchive() || dst.isDirectory())  
       dst = new TFile(dst, src.getName());  
     // Recursive copy.  
     src.cp_rp(dst);  
   } finally {  
     // Commit changes.  
     TVFS.umount();  
   }