checks how many times a character appears in a string.

Exercise9_4.java

import java.util.Scanner;

public class Exercise9_4 {
  public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.println("Please enter a string: ");
		String s1 = input.nextLine();
		System.out.println("Please enter a character: ");
		char s2 = input.nextLine().charAt(0);
		int counts = counts(s1, s2);
		System.out.println(counts);
	}

	public static int counts(String s1, char s2) {
		// TODO Auto-generated method stub
		int counts = 0;
		for (int i = 0; i < s1.length(); i++) {
			if (s1.charAt(i) == s2) {
				counts++;
			}
		}
		return counts;
	}
}