ReadWrite program advise

Hi all...I have this program that I wrote that creates a random number, writes it to a file and scans it back to the system. That part alone took me forever to hash out. Now I stuck. I would like to create 100 random integers and sort them in both the file and the printout.

Here is the code

Code java:

---

   import java.util.Random;
   import java.util.Scanner;
   public class ReadWriteData {
 
    // Main method
      public static void main (String[] args)throws Exception {
 
       //Create a file instance
         java.io.File file = new java.io.File("100 random  sorted numbers txt.");
 
         if (file.exists()) {
            System.out.println("File Already Exists");
            System.exit(0);
 
         }
 
         //Create a file
         java.io.PrintWriter output = new java.io.PrintWriter(file);
 
      	//Create ramdom number to be sorted
         Random randomGenerator = new Random();
 
         //Write formatted output to the file
         output.println(randomGenerator.nextInt(100));
 
         //close the output file
         output.close();
 
         //Create a Scanner for the file
         Scanner input = new Scanner(file); 
 
         //Read data from a file
         while (input.hasNext()) {
 
            int score = input.nextInt();
            System.out.println(
                  score);
         }
 
         //Close the input file
         input.close();    
      }
   }

---

Could someone advise me on the logic and code placement needed to pull this off?

Well I corrected my code to print and write 100 integers. On the other hand I'm completely stumped about how to sort it. Help me please!

Do I need an array? Where should that code go if I do? If not, then what?

Code java:

---

   import java.util.Random;
   import java.util.Scanner;
   public class ReadWriteData {
 
    // Main method
      public static void main (String[] args)throws Exception {
 
       //Create a file instance
         java.io.File file = new java.io.File("100 random  sorted numbers txt.");
 
         if (file.exists()) {
            System.out.println("File Already Exists");
            System.exit(0);
 
         }
 
         //Create a file
         java.io.PrintWriter output = new java.io.PrintWriter(file);
 
      	//Create ramdom number to be sorted
         Random randomGenerator = new Random();
 
         for (int i = 0; i < 100; i++) {
 
         //Write formatted output to the file
            output.println(randomGenerator.nextInt(100));
         }
 
         //close the output file
         output.close();
 
         //Create a Scanner for the file
         Scanner input = new Scanner(file); 
 
         //Read data from a file
         while (input.hasNext()) {
 
            int score = input.nextInt();
            System.out.println(
                  score);
         }
 
         //Close the input file
         input.close();    
      }
   }

---

I'm almost there. I decided to use my own class to sort but it's not working. It might be the placement.

Take a look...

Code java:

---

   import java.util.Random;
   import java.io.*;
 
   public class ReadWriteSort {
 
    //Creates an exception
      public static void main (String [] args)throws IOException { 
 
       //Assigns the variable digit as a random number
         Random digit = new Random();
 
       //Array with 100 numbers
         int list[] = new int[100];
         File file = new File("Exercise9_19.txt");
 
         if (file.exists()){
            System.out.println("The file " + file.getName() + " already exists.");
            System.out.println();
 
 
         }//ends if statement
 
         else {
 
            System.out.println("Your file has been written to " + (file.getName()+ "."));
            System.out.println();
         }
 
         try {
 
            Writer output = null;
 
          //Name of txt file
            File x = new File("Exercise9_19.txt");
            output = new BufferedWriter(new FileWriter(x));
 
          //for loop to create 100 random numbers
            for (int i = 0; i < list.length; i++) {
 
             //Set an array of random numbers with a range of 0 - 100 
               list[i] = (digit.nextInt(100));       
 
             //output is the array of random numbers  
               output.write(list[i]+" "); 
 
            }//ends for loop
 
            SelectionSort.selectionSort(list);//THIS MY BE MY PROBLEM!
 
          //ends output
            output.close();
 
            FileInputStream fstream = new FileInputStream("Exercise9_19.txt");
 
         // Get the object of DataInputStream
            DataInputStream input = new DataInputStream(fstream);
            BufferedReader br = new BufferedReader(new InputStreamReader(input));
            String strLine;
 
          //Read File Line By Line
            while ((strLine = br.readLine()) != null) {
 
            // Print the content on the console
               System.out.println (strLine);
            }
         //Close the input stream
            input.close();
 
         }//ends try
 
            //If there is no file
            catch (IOException e) {
               System.err.println("The file was not saved.");
               e.printStackTrace();
 
            }//ends catch
 
      }
 
    //Selction sort method
      public static class SelectionSort {
 
         static void selectionSort(int list[]) {
 
            for (int i = 0; i < list.length - 1; i++) {
               int currentMin = list[i];
               int currentMinIndex = i;
 
               for( int j = i + 1; j < list.length - 1; j++) {
                  if (currentMin > list[j]){
                     currentMin = list[j];
                     currentMinIndex = j;
                  }
               }
               if (currentMinIndex != i ){
                  list[currentMinIndex] = list[i];
                  list[i] = currentMin;
 
               }
            }
         }    
      }
   }//ends class

---

Please show me the way of my error!

Define 'its not working'... you've got a lot of code there that does several things so it can fail at any number of places. Break the problem down into its individual components and focus on what fails...if its the sort, then remove all else but the sort and some sample test input and go from there - post that code if you are having problems (this in other words, is the process of writing an SSCCE)

You don't have to create a separate class for sorting an array of ints. Just write a separate method for it.

1. Use list instead of array and use it's built in sort.
2. I mean to say, first put all random numbers in the list, sort them and place them in the file.