Find out count of all characters in string using HashMap (including special characters) in java


In this core java programming tutorial we will write a program to Find out count of all characters in string using HashMap (including special characters) in java.


Write a program to find out Find out count of all characters in string using hashMap, special characters also must be counted.

Example>
inputString is : This is it
Output is : T=1 h=1 i=3 s=2  =2 t=1

Must read: Fibonacci series using recursion in java.


Full Program/SourceCode/ Example to Find out count of all characters in string using HashMap (including special characters) in java >
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
/** Copyright (c), AnkitMittal www.JavaMadeSoEasy.com */
public class  CharacterCountInStringUsingHashMapExample {
  
   public static void main(String[] args) {
      String inputString="This is it";
       System.out.println("inputString is : "+inputString);
       System.out.print("Output is : ");
       characterCount(inputString);
   }
  
   /**
    * Method calculates count of all characters in inputString.
    */
   public static void characterCount(String inputString){
      Map<Character, Integer> map=new LinkedHashMap<Character, Integer>(); //LinkedHashMap used so that we could maintain insertion order.
      char[] inputAr=inputString.toCharArray();
     
      for(int i=0;i<inputAr.length;i++){
          char ch=inputAr[i];
          if(map.containsKey(ch))
                 map.put(ch, map.get(ch) +1);
          else
                 map.put(ch, 1);
                
      }
      /*
     * Till this point of program, we have stored all unique characters in map as key & corresponding value representing count of character.
     */  
      
      Iterator<Character> charIterator=map.keySet().iterator();
      while(charIterator.hasNext()){
          char ch=charIterator.next();
          System.out.print(ch+"="+map.get(ch)+" ");
      }
     
   }
  
}
/*OUTPUT
inputString is : This is it
Output is :T=1 h=1 i=3 s=2  =2 t=1
*/


So in this core java programming tutorial we learned how to write a program to Find out count of all characters in string using HashMap (including special characters) in java.

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