How to Count Occurrences of a Character in String - Java Programming Exercise Example

Write a program to count the number of occurrences of a character in String is one of the common programming interview questions not just in Java but also in other programming languages like C or C++.  As String in a very popular topic on programming interviews and there are lot of good programming exercise on String like "count number of vowels or consonants in String", "count number of characters in String" , How to reverse String in Java using recursion or without using StringBuffer etc, it becomes extremely important to have solid knowledge of String in Java or any other programming language. Though, this question is mostly used to test candidate's coding ability i.e. whether he can convert logic to code or not.

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