How to compare multiple pdf's in one folder with another folder using selenium java

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Java

selenium

Java8

I am trying to compare multiple pdf files in one folder with another but its not working for me can any one help below is the code i tried.

What I have tried:

public static void PDF_COMPARISON(String object, String data) throws Exception{
              
              try{
                     
                     File[] files = new File(object).listFiles(File::isFile);
                         
                      for (File file: files) {
                     
                  String fileExtension = file.getName().split("\\.")[file.getName().split("\\.").length - 1];
                     
                     if (fileExtension.toLowerCase().equals("pdf")) {
                             
                  String File1 =  file.getAbsolutePath();
                     
                  File[] files1 = new File(object).listFiles(File::isFile);
                  
                      for (File file2: files1) {
                     
                  String fileExtension1 = file2.getName().split("\\.")[file.getName().split("\\.").length - 1];
                     
                     if (fileExtension1.toLowerCase().equals("pdf")) {
                             
                  String File2 =  file2.getAbsolutePath();
              String ResultFile=Constants.Path_Result+DriverScript.s;
              new PdfComparator(File1,File2).compare().writeTo(ResultFile);
                     }}}}
              }catch(Exception e){
              Log.error("Not able to Close the Browser --- " + e.getMessage());
              DriverScript.bResult = false;
                       }
              }