Java Program to Count each Characters in a String

public class CountEachChar {

           

 public static void main(String[] args) {

           

                        String str="Java is a fun language";

                       

                        //Creating a HashMap containing char as a key and occurrences as  a value

                        String str1=str.toLowerCase();

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

                       

                        //Converting given string to char array

                        char[] strArray = str1.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);

                                               

                                    }

                                   

                        }

                       

                       

                        System.out.println(charCountMap);

                        }

  }

 Output:  { =4, a=5, s=1, u=2, e=1, v=1, f=1, g=2, i=1, j=1, l=1, n=2}