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

Simply use Java 8 Stream collectors groupby function:

    import java.util.function.Function;
    import java.util.stream.Collectors;  

    static String[] COUNTRY_NAMES 
  = { "China", "Australia", "India", "USA", "USSR", "UK", "China", 
  "France", "Poland", "Austria", "India", "USA", "Egypt", "China" };

    Map result = Stream.of(COUNTRY_NAMES).collect(
            Collectors.groupingBy(Function.identity(), Collectors.counting()));