Java Program To Count Occurrences Of Each Character In String

Chapter: Interview Programs Last Updated: 26-08-2016 14:12:31 UTC

Program:

            /* ............... START ............... */
                
import java.util.HashMap;

public class JavaCountOccurrences {

	static void characterCount(String inputString) {

		HashMap<Character, Integer> charCountMap = new HashMap<Character, Integer>();

		char[] strArray = inputString.toCharArray();

		for (char c : strArray) {
			if (charCountMap.containsKey(c)) {

				charCountMap.put(c, charCountMap.get(c) + 1);
			} else {
				charCountMap.put(c, 1);
			}
		}
		System.out.println(charCountMap);
	}

	public static void main(String[] args) {
		characterCount("Java J2EE Java JSP J2EE");

		characterCount("All Is Well");

		characterCount("Done And Gone");
	}
}
                /* ............... END ............... */
        

Output

{ =4, P=1, a=4, 2=2, S=1, E=4, v=2, J=5}
{ =2, A=1, s=1, e=1, W=1, I=1, l=4}
{ =2, A=1, D=1, d=1, e=2, G=1, n=3, o=2}

Tags

Count Occurrences Of Each Character, Java, Interview Programs

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