Count number of appearance of a digit in a string.

Exercise9_5.java

public class Exercise9_5 {
  public static void main(String[] args) {
		java.util.Scanner input = new java.util.Scanner(System.in);
		System.out.println("Please enter a string: ");
		String s1 = input.nextLine();
		int [] counts = countDigits(s1);
		
		// Display results.
		for (int i = 0; i < counts.length; i++) {
			if (counts [i] > 0) {
				System.out.println((char)(1 + i) + " appears " + counts[i] + ((counts[i] == 1) ? " time." : " times."));
			}
		}
	}

	public static int[] countDigits(String s1) {
		// TODO Auto-generated method stub
		int [] counts = new int [10];
		for (int i = 0; i < counts.length; i++) {
			if (Character.isDigit(s1.charAt(i))) {
				counts [s1.charAt(i) - 1]++;
			}
		}
		return counts;
	}