Calculating frequency of each word in a sentence in java

Question

I am writing a very basic java program that calculates frequency of each word in a sentence so far i managed to do this much

import java.io.*;

class Linked         


        

Answer 1

Created a simple easy to understand solution for this problem covers all test cases-

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

/*
 * Problem Statement - Count Frequency of each word in a given string, ignoring special characters and space 
 * Input 1 - "To be or Not to be"
 * Output 1 - to(2 times), be(2 times), or(1 time), not(1 time)
 * 
 * Input 2 -"Star 123 ### 123 star"
 * Output - Star(2 times), 123(2 times)
 */

public class FrequencyofWords {

    public static void main(String[] args) {
        String s1="To be or not **** to be! is all i ask for";
        fnFrequencyofWords(s1);
        
    }
    
    //-------Supporting Function-----------------
    static void fnFrequencyofWords(String s1) {
        //------- Convert String to proper format----
        s1=s1.replaceAll("[^A-Za-z0-9\\s]","");
        s1=s1.replaceAll(" +"," ");
        s1=s1.toLowerCase();
        
        //-------Create String to an array with words------
        String[] s2=s1.split(" ");
        System.out.println(s1);
            
        //-------- Create a HashMap to store each word and its count--
        Map  map=new HashMap();
        for(int i=0;i