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

Use google guava Multiset.

Multiset wordsMultiset = HashMultiset.create();
wordsMultiset.addAll(words);
for(Multiset.Entry entry:wordsMultiset.entrySet()){
     System.out.println(entry.getElement()+" - "+entry.getCount());
}