Find duplicate characters in a String and count the number of occurances using Java

Question

How can I find the number of occurrences of a character in a string?

For example: The quick brown fox jumped over the lazy dog.

Some example

Answer 1

public static void main(String args[]) {
    char Char;
    int count;
    String a = "Hi my name is Rahul";
    a = a.toLowerCase();
    for (Char = 'a'; Char <= 'z'; Char++) {
        count = 0;
        for (int i = 0; i < a.length(); i++) {
            if (a.charAt(i) == Char) {
                count++;
            }
        }
        System.out.println("Number of occurences of " + Char + " is " + count);
    }
}