Create OccurenceOfCharInString.java

Java program to count the occurrence of each character in a string using Hashmap

Java/OccurenceOfCharInString.java

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+// Java program to count frequencies of
+// characters in string using Hashmap
+
+class OccurenceOfCharInString {
+ static void characterCount(String inputString)
+ {
+ // Creating a HashMap containing char
+ // as a key and occurrences as a value
+ HashMap<Character, Integer> charCountMap
+ = new HashMap<Character, Integer>();
+
+ // Converting given string to char array
+
+ char[] strArray = inputString.toCharArray();
+
+ // checking each char of strArray
+ for (char c : strArray) {
+ if (charCountMap.containsKey(c)) {
+
+ // If char is present in charCountMap,
+ // incrementing it's count by 1
+ charCountMap.put(c, charCountMap.get(c) + 1);
+ }
+ else {
+
+ // If char is not present in charCountMap,
+ // putting this char to charCountMap with 1 as it's value
+ charCountMap.put(c, 1);
+ }
+ }
+
+ // Printing the charCountMap
+ for (Map.Entry entry : charCountMap.entrySet()) {
+ System.out.println(entry.getKey() + " " + entry.getValue());
+ }
+ }
+
+ // Driver Code
+ public static void main(String[] args)
+ {
+ String str = "Ajit";
+ characterCount(str);
+ }
+}