package string;

import java.util.HashMap;

import java.util.Map;

import java.util.stream.Stream;

import static java.util.function.Function.identity;

import static java.util.stream.Collectors.*;

public class Question26 {

public static void main(String[] args) {

String word = "HelloWorld";

System.out.println(wordFrequencyLambda(word));

System.out.println(wordFrequencyCollectGroupBy(word));

}

private static Map<String, Integer> wordFrequencyLambda(String word) {

Map<String, Integer> wordMap = new HashMap<>();

Stream.of(word.split("")).forEach(letter->

wordMap.compute(letter, (key, value) -> wordMap.get(key) == null ? 1 : value + 1));

return wordMap;

}

private static Map<String, Long> wordFrequencyCollectGroupBy(String word) {

return Stream.of(word.split("")).collect(groupingBy(identity(), counting()));

}

/*private static Map<String, Integer> wordFrequencyCollectToMap(String word) {

return Stream.of(word.split(""))

.collect(toMap(identity(),1,(value1,value2)->(value1)));

String mutiLine = "hellohow";

}*/

}