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Java Program to get frequency of words with Lambda Expression
Let’s say the following is the List −
List<String> list = Arrays.asList("Welcome", "to","the","club", "club", "the");No, let us create a Map to get the frequency of words. Here, we are using Lambda Expression as well −
Map<String, Integer> map = list
.parallelStream()
.flatMap(a -> Arrays.asList(a.split(" ")).stream())
.collect(
Collectors.toConcurrentMap(c ->c.toLowerCase(), c -> 1,
Integer::sum));Example
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
public class Demo {
public static void main(String[] args) {
List<String> list = Arrays.asList("Welcome", "to","the","club", "club", "the");
Map<String, Integer> map = list
.parallelStream()
.flatMap(a -> Arrays.asList(a.split(" ")).stream())
.collect(
Collectors.toConcurrentMap(c ->c.toLowerCase(), c -> 1,
Integer::sum));
System.out.println("Word Frequency = "+map);
}
}Output
Word Frequency = {the=2, club=2, to=1, welcome=1}
Updated on: 30-Jul-2019
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