Help with input output .txt files!

Question

Hi i'm a student and totally new to programming. I need the program to read a .txt file and then output it:
import java.io.*;
import java.util.*;
public class Reading{
     public static void main(String[] args)throws Exception{
          Scanner scanner = new Scanner(new File(args[0]));
          while(scanner.hasNext()){
               System.out.println(scanner.next());
          scanner.close();
and
import java.io.*;
public class Writing{
     public static void main(String[] args)throws Exception{
          String outputFile = args[0];
          PrintWriter writer = new PrintWriter(new BufferedWriter(new FileWriter(outputFile)));
          for(int i = 0; i < 100; i++){
               writer.println(i * i);
          writer.close();
How would i merge these together? I also changed the command line to java Reading Input.txt but it wont run on DrJava on my computer or laptop and i get an error? How do i then store the strings into an arraylist and iterate throught the arraylist to reverse the strings?
Please help.

Answer 1

You could do this...
import java.io.*;
import java.util.*;
public class FileIO2
     public static void main(String argsp[])
          String readfile="ajr.txt";
          String writefile="ajr2.txt";
          try{
          read(readfile);
          write(writefile);
          catch(Exception e)
          {e.printStackTrace();}
     public static void read(String filename) throws Exception
          Scanner scanner = new Scanner(new File(filename));
          while(scanner.hasNext()){
               System.out.println(scanner.next());
          scanner.close();
     public static void write(String filename) throws Exception
          String outputFile = filename;
          PrintWriter writer = new PrintWriter(new BufferedWriter(new FileWriter(outputFile)));
          for(int i = 0; i < 100; i++){
               writer.println(i * i);
          writer.close();
}