ReadWriteIO.java

/*
Rahim Siddiq
May 26 2023
Write/Read Data
*/

import java.io.*;
import java.util.*;

public class ReadWriteIO
{
	public static void main(String[] args) throws IOException
	{
        // Create a file object and check to see if it already exists
        File file = new File("Exercise12_15.txt");
        if (file.exists())
        {
        	System.out.println("File already exists");
            System.exit(1);
        }
        
        // Create PrintWriter object to write to file
        PrintWriter output = new PrintWriter(file);

        // New random object for generating random numbers
        Random random = new Random();
        
        // Loop uses both objects to write 100 random numbers to file
        for (int i = 0; i < 100; i++)
        {
            output.print(random.nextInt() + " ");
        }
        // Close the file
        output.close();

        // Scanner object for reading data from file
        Scanner scanner = new Scanner(file);
        // Integer array called numbers to hold the data read from file
        int[] numbers = new int[100];
        // Loop to read data from file assigns each element to the index for numbers array
        for (int i = 0; i < 100; i++)
        {
            numbers[i] = scanner.nextInt();
        }
        // Elements in array sorted using Arrays.sort() method
        Arrays.sort(numbers);
        // Loop to print sorted elements of the array
        for (int number : numbers)
        {
            System.out.println(number);
        }
        // Close the scanner to prevent resource leak
        scanner.close();
    }
}