I want to compare two .csv files and want to read the cell values and want it to display the output (cell values) in a new excel. In selenium java

Currently my code is as below; i need to get the output in the console and also want the selenium to write a new excel file with cell vales. What can be done?

qestion:I want to compare two .csv files and want to read the cell values and want it to display the output (cell values) in a new excel. In selenium java.

{
 String path="C:\\...";
   String file1="file1.csv";
   String file2="file2.csv";
  
   ArrayList<String> al1=new ArrayList<String>();
   ArrayList<String> al2=new ArrayList<String>();{
   //ArrayList al3=new ArrayList();
   try {

   BufferedReader CSVFile1 = new BufferedReader(new FileReader(path+file1));
   
   
   String dataRow1 = CSVFile1.readLine();
   {
   while (dataRow1 != null)
   {
       String[] dataArray1 = dataRow1.split(",");
       for (String item1:dataArray1)
       { 
          al1.add(item1);
       }

       dataRow1 = CSVFile1.readLine(); // Read next line of data.
   }

    CSVFile1.close();
   }
    

   BufferedReader CSVFile2 = new BufferedReader(new FileReader(path+file2));
   String dataRow2 = CSVFile2.readLine();
   while (dataRow2 != null)
   {
       String[] dataArray2 = dataRow2.split(",");
       for (String item2:dataArray2)
       { 
          al2.add(item2);

       }
       dataRow2 = CSVFile2.readLine(); // Read next line of data.
   }
    CSVFile2.close();

    for(String bs:al2)
    {
        al1.remove(bs);``
    }

    int size=al1.size();
    System.out.println(size);`enter code here`
   }
}