package javaidetest;

import java.io.File;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.FileWriter;

import javax.swing.*;
import java.awt.*;

public class Main
{
   
    public Main() {}
   
    public static void main(String[] args) throws IOException
    {
        //String Reader
        BufferedReader InStream = new BufferedReader (new InputStreamReader (System.in));
        //File Writer
        BufferedWriter OuStream = new BufferedWriter (new FileWriter ("Full List.txt"));

        //[Input] Destined Directory
        String DirName;
        DirName = InStream.readLine ();
        File DIR = new File (DirName);

        //[List] Full Folder List
        String[] SortingList = DIR.list ();
        int MArrSize = -1;
        int Check = 0;

        for (int indx = 1 ; indx < SortingList.length ; indx++)
        {
            if (indx >= 1000)
            {
                MArrSize = 0;
            }
            else
            {
                if (indx >= 100)
                {
                    MArrSize = 1;
                }
                else
                {
                    if (indx >= 10)
                    {
                    MArrSize = 2;
                    }
                    else
                    {
                    MArrSize = 3;
                    }
                }
            }

            for (int indy = 1 ; indy <= MArrSize ; indy++)
            {
                OuStream.write ("0");
            }

            String ListNo = "" + indx;

            OuStream.write (ListNo);
            OuStream.write (".");
            OuStream.write (" " + SortingList [indx - 1]);
            OuStream.newLine ();
        }
        System.out.println (SortingList.length);
    }   
}

package javaidetest;

import java.io.File;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.FileWriter;

import javax.swing.*;
import java.awt.*;

public class Main {
   public static void main(String[] args) throws IOException {
      //String Reader
      BufferedReader inStream = new BufferedReader(
         new InputStreamReader(System.in));
                  
      //File Writer
      BufferedWriter outStream = new BufferedWriter(
         new FileWriter("Full List.txt"));

      //[Input] Destined Directory
      String dirName = inStream.readLine();
      File dir = new File(dirName);

      //[List] Full Folder List
      String[] sortingList = dir.list();
      int mArrSize = -1;
      int check = 0;

      for (int indx = 1 ; indx < sortingList.length ; indx++) {
         if (indx >= 1000) {
            mArrSize = 0;
         }
         else if (indx >= 100) {
            mArrSize = 1;
         }
         else if (indx >= 10) {
            mArrSize = 2;
         }
         else {
            mArrSize = 3;
         }

         for (int indy = 1 ; indy <= mArrSize ; indy++) {
            outStream.write("0");
         }

         String listNo = "" + indx;

         outStream.write(listNo);
         outStream.write(".");
         outStream.write(" " + sortingList[indx - 1]);
         outStream.newLine();
      }
               
      System.out.println(sortingList.length);
   }   
}

for (int indx = 1; indx <= sortingList.length; indx++) {
   ...
}

int[] someArray = {9, 2, 4, 5, 6, 10, -1};

for (int i = 0; i < someArray.length; i++) {
  someArray[i] = someValue //whatever you want to do
}