JAVA EE: How to filter a Map and return a filtered Map using Java 8 streams

Thursday 31 August 2017

Click here to watch in Youtube :
https://www.youtube.com/watch?v=y4dlPsXk3AQ&list=UUhwKlOVR041tngjerWxVccw

StreamDemo.java

import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;

/**
 *
 * Example to filter a Map and return a map.
 */
public class StreamDemo
{
    public static void main(String[] args)
    {

        Map<Integer, String> fruitsMap = new HashMap<>();
        fruitsMap.put(1, "Apple");
        fruitsMap.put(2, "Orange");
        fruitsMap.put(3, "Banana");

         //Map -> Stream -> Filter -> Map
        Map<Integer, String> filteredMap = fruitsMap.entrySet().stream()
                .filter(map -> map.getKey() == 2)
                .collect(Collectors.toMap(p -> p.getKey(), p -> p.getValue()));

        System.out.println(filteredMap);

    }

}