Java Program To Find Frequency Of Character In String

Chapter: Interview Programs Last Updated: 28-09-2017 16:01:57 UTC

Program:

            /* ............... START ............... */
                
public class JavaFindFrequencyOfCharacter {

	public static void main(String[] args) {
		String str = "welcome to the world of programming.";
		char ch = 'e';
		int frequency = 0;

		for (int i = 0; i < str.length(); i++) {
			if (ch == str.charAt(i)) {
				++frequency;
			}
		}

		System.out.println("Frequency of " + ch + " = " + frequency);
	}

}

                /* ............... END ............... */
        

Output

Frequency of e = 3

Notes:

  • First we initialize the string str with value "welcome to the world of programming."
  • Next step loop each character in the string, using charAt() function which takes the index and returns the character in the given index.
  • We compare each character to the given character ch. If it's a match, we increase the value of frequency by 1.
  • Last we will print the frequency using System.out.println.

Tags

Find Frequency Of Character In String, Java, Interview

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