java8Examples/Java8Examples/src/streams/GroupByCountSort.java at master · suatoz/java8Examples · GitHub

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package streams;

import java.util.ArrayList;

import java.util.LinkedHashMap;

import java.util.List;

import java.util.Map;

import java.util.function.Function;

import java.util.stream.Collectors;

public class GroupByCountSort {

public static List<String> items = new ArrayList<String>();

static {

items.add("apple");

items.add("banana");

items.add("orance");

items.add("papaya");

items.add("pinapple");

}

public static void main(String[] args) {

countEx();

System.out.println("<------------------------------------------->");

sorting();

}

private static void countEx() {

Map<String,Long> result = items.stream().collect(Collectors.groupingBy(

Function.identity(),Collectors.counting()));

result.forEach((k,v)->{

System.out.println(k + " " + v);

});

}

private static void sorting() {

Map<String, Long> result = items.stream().collect(

Collectors.groupingBy(Function.identity(),Collectors.counting())

);

Map<String, Long> finalMap = new LinkedHashMap<>();

result.entrySet().stream().sorted(

Map.Entry.<String, Long>comparingByValue().reversed()).forEachOrdered(e->finalMap.put(e.getKey(), e.getValue()));

finalMap.forEach((k,v)->{

System.out.println(k + " " + v);

});

}

java8Examples/Java8Examples/src/streams/GroupByCountSort.java at master · suatoz/java8Examples · GitHub

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