Java 8 Streams - Count Frequency Of Words In a List
Example 1 import java.util.Arrays; import java.util.List; import java.util.Map; import java.util.function.Function; import java.util.stream.Collectors; public class Main { public static void main( String [] args) { List < String > words = Arrays .asList( "cat" , "rat" , "bat" , "cow" , "cat" , "bat" ); // For Long values Map < String , Long > result = words.stream() .collect(Collectors.groupingBy(Function.identity(), Collectors.counting())); System.out.println(result); } } The List interface in Java provides a way to store the ordered collection. It is a child interface of Collection. It is an ordered collection of objects in which duplicate values can be stored. The asList () method of java.util.Arrays class is used to return a fixed-size list backed by the specified array. This method acts as a bridg