Java Program to count occurrences of a char in a String.

There are following ways to count the number of occurrences of a char in a String in Java.

  • First we create a noOfOcurrenceCharInString method.
  • Pass this method a char and string value parameter.
  • Initialize a variable count to read all duplicate character.
  • Now convert the string to char array.
  • Traverse the all char array value.
  • Inside if condition we compare the given character with char array index value character.
  • If it is equal then increment the count.
  • Now print the count value means the number of occurrences of a character.
				
					public class NoOfGivenDuplicateChar {
	public static void main(String[] args) {

		int m = NoOfGivenDuplicateChar.noOfOcurrenceCharInString('a', "java is a language");
		System.out.println("number of occurance character 'a' is :- " + m);
	}
	public static int noOfOcurrenceCharInString(char c, String str) {
		// TODO Auto-generated method stub
		int count = 0;
		char[] ch = str.toCharArray();
		for (int i = 0; i < ch.length; i++) {
			if (c == ch[i]) {
				count++;
			}
		}
		return count;
	}
}

Output :-
number of occurance character ‘a’ is :- 5