Thread: Cannot get the program to write and display properly

OK, time to give the noob a hard time. I am writing a program that is supposed to use an algorithm to write all even integers from 1 to 100 to a file, close the file, then display the results. Then id is supposed to append the file with all of the odd integers from 1 to 100, close the file, reopen and display the results. Something like: 1st list - 2, 4, 6, 8, ......., 98, 100 2nd list - 2, 4, 6, 8, ......., 98, 100, 1 , 3, 5, ...., 97, 99

I get the even(1st) list fine. The 2nd list displays just the even numbers, I cannot get it to display the odd numbers. Sure it is something simple, usually is. My brain is mush right now and I am not seeing it. Thanks for any help!!

import java.io.*;
 
 
public class TextFileIO {
public static void main(String[] args) throws Exception {
 
    //Create newFile
    File newFile = new File("numbers.dat");
    newFile.createNewFile();
 
 
 
    int evenNum = 0;
    int oddNum = 0;
 
   try{
       BufferedWriter writer = new BufferedWriter(new FileWriter(newFile)); 
 
 
    //Loop from 1 to 100
    for (int i = 2; i <= 100; i+=2)
    { 
       evenNum += i + 1;
       writer.write("" + i + ", ");
    }   
 
    writer.newLine();
    writer.close();
 
    BufferedReader reader = new BufferedReader(new FileReader(newFile));
    System.out.println(reader.readLine());
 
    reader.close();
 
    BufferedWriter writer2 = new BufferedWriter(new FileWriter(newFile, true)); 
 
    for(int i = 1; i < 100; i +=2) {  
            oddNum += i;  
            writer2.write("" + i + ", ");  
        }  
    writer2.newLine();
    writer2.close();
 
    BufferedReader reader2 = new BufferedReader(new FileReader(newFile));
 
    System.out.printf(reader2.readLine());
 
   }
 
   catch (Exception e){
 
   }
 }
}

I thought that the code below was supposed to take care of that:

BufferedWriter writer2 = new BufferedWriter(new FileWriter(newFile, true));

The output is supposed to be:
2, 4, 6, 8, ........... 96, 98, 100
2, 4, 6, 8, ........... 96, 98, 100, 1, 3, 5, 7, ..........95, 97, 99

I get:
2, 4, 6, 8, ........... 96, 98, 100,
2, 4, 6, 8, ........... 96, 98, 100,

It is not writing and/or printing the odd numbers

Edit: Too Slow

Have you opened your numbers.dat file to see the contents? Is it there?
What happens if you read another line after the last print statement?

OK, the file contains the correct data, even numbers on the 1st line and odd on the 2nd line. And now it wants to work adding a second

System.out.printf(reader2.readLine());

Didn't like it before, it just printed the 1st line once. How about this question. How do I get the comma off of the last number on the list? Right now it displays:
2, 4, 6, ...........98, 100,
2, 4, 6, ...........98, 100, 1, 3, 5, ............97, 99,

I know its a cosmetic thing. Thanks for your help Norm and Kewish!!!