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Java Program To Find Out Character Occurances In A String

 Java Program To Find Out Character Occurences In A String

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import java.util.HashMap;
import java.util.Map;

public class OccuranceOfCharInString {

    public static void main(String[] args) {
        // Java Program To Count the Occurnaces Of Character In A String.

        String str = "WelcomeToJava";

        // create HashMap Containing char as key and occurance as a value
        HashMap<Character, Integer> charMap = new HashMap<Character, Integer>();

        // converting given String to An Array
        char ch[] = str.toCharArray();

        // Loop for checking each character of str Array
        for (char c : ch) {
            if (charMap.containsKey(c)) {
                // If char is present in charMap,
                // incrementing it's count by 1

                charMap.put(c, charMap.get(c) + 1);
            } else {
                // If char is not present in charCountMap,
                // putting this char to charCountMap with 1 as it's value

                charMap.put(c, 1);

            }

        }

        // Printing the charMap
        for (Map.Entry entry : charMap.entrySet()) {
            System.out.println(entry.getKey() + " " + entry.getValue());
        }

    }

}

output:
=============


a 2 c 1 T 1 e 2 v 1 W 1 J 1 l 1 m 1 o 2
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