Counts the number of occurances for all numbers 1-10 from user input.

NumCount.java

/*
  Class: CountNum
  Author: Andrew J Kerr <me@andrewjkerr.com>
  Summary: Counts the number of occurances for all numbers 1-10 from user input.
*/

import java.util.*;
public class CountNum
{

  /// Summary:
  /// Main method
  public static void main(String[] args)
  {
    ArrayList<Integer> numbers = getInput();
    countNumbers(numbers);
  }

  /// Summary:
  /// Creates an ArrayList of numbers based on the input of a user
  public static ArrayList<Integer> getInput()
  {
    // Tell user how program operates
    System.out.println("Enter integers between 1 and 10 on a newline. Enter a 0 to signal the end of your input");

    // Create a new ArrayList; will be returned later
    ArrayList<Integer> numbers = new ArrayList<Integer>();

    // Set up the scanner
    Scanner input = new Scanner(System.in);

    // Set flag
    boolean flag = true;

    // Declare number for use in loop
    int number = 0;

    // Loop through user input
    while(flag)
    {
      // Get user input
      number = input.nextInt();

      // Check if user input == 0
      if(number != 0)
      {
        // Check to see whether number is valid or not
        if(number > 0 && number <= 10)
        {
          // Add number to ArrayList
          numbers.add(number);
        }
        else
        {
          // If not valid, print out error to user
          System.out.println("Sorry, but you did not enter a number between 1 and 10!");
        }
      }
      else
      {
        flag = false;
      }
    }

    return numbers;

  }


  /// Summary:
  /// Counts the number of occurances of a number in an ArrayList

  /// Params:
  /// ArrayList<int> numbers: an ArrayList containing numbers obtained by user input
  /// int numToCount: the number to check for number of occurances
  public static void countNumbers(ArrayList<Integer> numbers)
  {

    // Default numOccurances to 0
    int numOccurances = 0;

    // Iterate through possible numbers
    for(int i = 1; i <= 10; i++)
    {
      // Call countOccurancesOfNumber
      numOccurances = countOccurancesOfNumber(numbers, i);

      // Print it out! :)
      System.out.println(i + " occurs " + numOccurances + " times.");
    }
  }

  /// Summary:
  /// Counts the number of occurances of a number in an ArrayList

  /// Params:
  /// ArrayList<int> numbers: an ArrayList containing numbers obtained by user input
  /// int numToCount: the number to check for number of occurances
  public static int countOccurancesOfNumber(ArrayList<Integer> numbers, int numToCount)
  {

    // Default numOccurances to 0
    int numOccurances = 0;

    // Iterate through ArrayList... linear search, lol.
    for(Integer i : numbers)
    {

      // If the numbers match up, iterate the count.
      if(i == numToCount)
      {
        numOccurances++;
      }
    }

    return numOccurances;
  }
}