NewExam java Try 1st Time

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.BufferedReader;
import java.util.Scanner;
public class NewExam
{
    static String txtw="";
    public static void main (String[] args)
    {

        String input ="";
        //String input = new Scanner(System.in).nextLine();
        String path = "D:\\Study\\Java\\NewMain\\src\\input.txt";
        File file = new File(path);
        try
        {
            BufferedReader br = new BufferedReader (new FileReader(file));
            String line="";
            while ((line = br.readLine()) != null)
            {
                input = line;

                check(input);
            }

            br.close();
        }
        catch(IOException e)
        {
            e.printStackTrace();
        }
    }
    static void check (String inputname)
    {

        char[] lower = "abcdefghijklmnopqrstuvwxyz" .toCharArray();
        char[] higher = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" .toCharArray();
        char[] lowerdecode = "ZYXWVUTSRQPONMLKJIHGFEDCBA" .toCharArray();
        char[] higherdecode = "zyxwvutsrqponmlkjihgfedcba" .toCharArray();
        String sumtext="";
        int inputlong = inputname.length();
        char[] cinput = inputname.toCharArray();
        for (int a=0;a<inputlong;a++)
        {
            if(Character.isLetter(cinput[a]))
            {

                for (int i = 0 ; i < 26 ; i++)
                {
                    if(cinput[a] == lower[i])
                    {
                        String tmp = Character.toString(lowerdecode[i]);
                        sumtext += tmp;
                    }
                    else if (cinput[a] == higher[i])
                    {
                        String tmp2 = Character.toString(higherdecode[i]);
                        sumtext += tmp2;
                    }
                }
            }
            else
            {
                String tmp3 = Character.toString(cinput[a]);
                sumtext += tmp3;
            }

        }

        txtw = sumtext+"\n";
        System.out.print(txtw);
        writefile();
    }
    static void writefile ()
    {
        try
        {
            FileWriter writer = new FileWriter("D:\\Study\\Java\\NewMain\\src\\output.txt",true);
            writer.write(txtw);
             writer.write(System.getProperty( "line.separator" ));
            writer.close();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }
}