Comparison of two files in java

public class FileCompare {
 /**
  * @param args
  */
 static String lineReader1 = "";
 static String lineReader2 = "";
 static LinkedList<String> fileList1 = new LinkedList<String>();
 static LinkedList<String> fileList2 = new LinkedList<String>();

 public static void main(String[] args) throws IOException {
  // TODO Auto-generated method stub
  JFrame f=new JFrame("File Comparator: Beta Version");//creating instance of JFrame 
  f.setResizable(false);

  //Text Filed for CSS file
  final JTextField textfield1 = new JTextField(""); 
  textfield1.setBounds(20,50,120, 25);//x axis, y axis, width, height 
  // Label1
  final JLabel label1 = new JLabel(" FILE1 PATH");
  label1.setBounds(20,25,120, 25);
  label1.setVisible(true);
  f.add(label1);
  //Label2
  final JLabel label2 = new JLabel(" FILE2 PATH");
  label2.setBounds(160,25,120, 25);
  label2.setVisible(true);
  f.add(label2);
  //Text Filed for ODI file
  final JTextField textfield2 = new JTextField(""); 
  textfield2.setBounds(160,50,120, 25);//x axis, y axis, width, height
  JButton b=new JButton("Compare");//creating instance of JButton 
  b.setBounds(80,100,150, 20);//x axis, y axis, width, height 
  b.addActionListener(new ActionListener() {
   @Override
   public void actionPerformed(ActionEvent e) {
    // TODO Auto-generated method stub
    if(textfield1.getText()==null || textfield1.getText().isEmpty()
      && textfield2.getText()==null||textfield2.getText().isEmpty()){
     JOptionPane.showMessageDialog(null, "Provide the file names ");
    }
    else
    {
     StringBuffer sb = new StringBuffer();
     try {
      //READING CSS FILE
      FileReader expectedFileReader = new FileReader(textfield1.getText());
      BufferedReader brExpected = new BufferedReader(expectedFileReader);
      while ((lineReader1 = brExpected.readLine()) != null) {
       fileList1.add(lineReader1);}
      //READING ODI FILE
      FileReader generatedFileReader = new FileReader(textfield2.getText());
      BufferedReader brGenerated = new BufferedReader(generatedFileReader);
      while ((lineReader2 = brGenerated.readLine()) != null) {
       fileList2.add(lineReader2);}

      if(fileList1.size()==fileList2.size())
      {
       for ( int lineNum =1;lineNum<fileList2.size();lineNum++)
       {
        String sstr1 =fileList1.get(lineNum);
        String sstr2 =fileList2.get(lineNum);
        System.out.println("st11---"+sstr1);
        System.out.println("st22-------------"+sstr2);
 
 
        if(fileList1.get(lineNum).toString().equals(fileList2.get(lineNum).toString()))
        {
         System.out.println("Two files have same content.");
        }
        else if(! fileList1.get(lineNum).equals(fileList2.get(lineNum)))
        {
         String str1 ="FILE1 Line No:"+lineNum +"--"+fileList1.get(lineNum);
         String str2= "FILE2 Line No:"+lineNum +"--"+fileList2.get(lineNum);
         sb.append(str1);
         sb.append(System.lineSeparator());
         sb.append(str2);
         sb.append(System.lineSeparator());
        }
       }
      
      
       File f = new File("C:\\FILESS\\differnce.txt");
       if(f.exists() && !f.isDirectory()) {
        f.delete();
       }
                                     
      
       new File("C:\\FILESS").mkdir();
       FileWriter writer;
       writer = new FileWriter("C:\\FILESS\\differnce.txt");
       writer.write(sb.toString());
       writer.flush();
       writer.close();
       JOptionPane.showMessageDialog(null, "File created at C:\\FILESS\\differnce.txt");
      }
      else{
       System.out.println("No of lines in Both files are  not equal");
       JOptionPane.showMessageDialog(null, "No of lines in Both files are  not equal");
      }
     }
     catch (FileNotFoundException e2) {
      // TODO Auto-generated catch block
      e2.printStackTrace();
     }
     catch (IOException e1 )
     {
      // TODO Auto-generated catch block
      e1.printStackTrace();
     }
     catch (Exception e1 )
     {
      // TODO Auto-generated catch block
      e1.printStackTrace();
     }
    }
   }
  }
    );
  f.add(textfield1);//adding button in JFrame 
  f.add(textfield2);//adding button in JFrame 
  f.add(b);//adding button in JFrame 
  f.setSize(400,200);//400 width and 500 height 
  f.setLayout(null);//using no layout managers 
  f.setVisible(true);//making the frame visible 

 }
}