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

Java 8 way:

"The quick brown fox jumped over the lazy dog."
        .chars()
        .mapToObj(i -> (char) i)
        .collect(Collectors.groupingBy(Object::toString, Collectors.counting()));