8- Stream using List and Map(Code)

 Write a code that uses List and Map using concepts of stream in java 8

package com.java.stream.demo;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

public class ForEachDemo {

    // filter----> conditional check

    public static void main(String[] args) {

        List<String> list = new ArrayList<>();

        list.add("Murrit");

        list.add("john");

        list.add("piter");

        list.add("marek");

        list.add("mac");

                 // For each loop that prints list of names that starts with m(small m case sensitive)

        for (String s : list) {

            if (s.startsWith("m")) {

                System.out.println(s);

            }

        }

       

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

             

                 // Stream and filter that prints list of names that starts with m(small m case sensitive)

        list.stream().filter(t -> t.startsWith("m")).forEach(t -> System.out.println(t));

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

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

        map.put(1, "a");

        map.put(2, "b");

        map.put(3, "c");

        map.put(4, "d");

        map.entrySet().stream().filter(k -> k.getKey() % 2 == 0).forEach(obj -> System.out.println(obj));

    }

}

CONSOLE

marek

mac

----------------------------------

marek

mac

----------------------------------

2=b

4=d

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