Take a file as input, get the value from file and insert it in a ArrayList after inserting write all the values of list in other file...

sample: 
Input file: input.txt

class Employee

{

     private String name;

     public Integer age;

     protected Date dob;

     public Address addr;

     private Date doj;

     public  String designation;

}

output file: output.txt(Empty file)

InputFile.java

package com.test;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.ObjectOutputStream;

import java.util.ArrayList;

public class InputFil

{

       public static void main(String[] args) throws IOException

       {        

           BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

           System.out.println("Enter File Name:");

           String fname=br.readLine();

        try

        {    

            @SuppressWarnings("unused")

            FileInputStream f=new FileInputStream(fname);

            System.out.println("*****************************************************");

             System.out.println("content of file are:");

             System.out.println("************************");

            FileReader file=new FileReader(fname);

            BufferedReader b=new BufferedReader(file);

            String s1=b.readLine();

            while(s1!=null)

            {

                    System.out.println(s1);

                    s1=b.readLine();        

            }

        }

        catch(FileNotFoundException e)

        {

            System.out.println("File not Found");

            return;

        }   

        System.out.println("*****************************************************");

        ArrayList<String>rows = new ArrayList<String>();

        try {

            System.out.println("*****************************************************");

            System.out.println("In Array List :");

            System.out.println("*******************");

            BufferedReader r = new BufferedReader(new FileReader(

                    fname));

            String line = null;

          

            while ((line = r.readLine()) != null)

            {

                String[] arr=line.split("\\s+");

              

                rows.add(line);

            }

            System.out.println(rows.toString());

        } catch (IOException e)

          {

            e.printStackTrace();

        }

            BufferedWriter writer=null;

            writer = new BufferedWriter(new FileWriter("output.txt"));

            //ObjectOutputStream out = new ObjectOutputStream((output));

            String listWord;

              

            for (int i = 0; i< rows.size(); i++)

            {

            listWord = rows.get(i);

            writer.write(listWord);

            writer.write("\n");

            }

            writer.close();   

        }

    }

output of program

Enter File Name:
input.txt
*****************************************************
content of file are:
************************
class Employee
{
     private String name;
     public Integer age;
     protected Date dob;
     public Address addr;
     private Date doj;
     public  String designation;

}
*****************************************************
*****************************************************
In Array List :
*******************
[class Employee, {,      private String name;,      public Integer age;,      protected Date dob;,      public Address addr;,      private Date doj;,      public  String designation;, , }]



open output.txt (we can see all data in input.txt now available in output.txt)

class Employee
{
     private String name;
     public Integer age;
     protected Date dob;
     public Address addr;
     private Date doj;
     public  String designation;

}