Thread: Create 100 integers?

Hi all.

This program is meant to do the following:

1: create a new txt file
2: write 100 random integers to it
3: read it back into an array
4: sort the array
5: print contents of array

I have everything working apart from part 2. I can't get it to create 100 numbers. Sometimes it does 50, other times 62, 25, 99 etc.
Not sure on how to fix this. Any help much appreciated.

My code below.

 
import java.io.*;
import java.util.*;
 
public class Q3
{
	public static void main(String[] args)
	//Throw any exceptions
	throws Exception
	{
		// Create file called Q3.txt
		FileWriter newFileWriter = new FileWriter("Q3.txt");
		BufferedWriter newFileOut = new BufferedWriter(newFileWriter);
 
		//Random Number Generator
		Random numberGenerator = new Random();
 
		//Write 100 random numbers to Q3.txt
		for (int i = 0; i < 100; i++)
		{
			//while number of numbers is less than 100, increment the counter
			//and enter a random number to the file followed by a space
			int randomNumber = numberGenerator.nextInt(100);
			newFileOut.write(randomNumber + " ");
		}
		//Close the file writer
		newFileOut.close();
 
		//crate file scanner to read file
		Scanner input = new Scanner(new File("Q3.txt"));
		//create array with contents of the file
		int[] array = new int[input.nextInt()];
		//every next number is sent to next position on the array
		for (int i = 0; i < array.length; i++)
		    array[i] = input.nextInt();
		//sort the array in ascending order
		Arrays.sort(array);
		//parse the array contents to a string and print the string
		System.out.println(Arrays.toString(array));
		//close the file reader
		input.close();
	}
}

How are you determining that the correct number of integers is NOT being written to the file? Try inspecting the file, paying particular attention to the first number in the file.

Then, consider the reason you're seeing variable results is because of this line:

int[] array = new int[input.nextInt()];

Put the two findings together to determine the root cause and design a fix.

That helped, solved and working.

Thank you sir.