Map: forEach example: Java 8 !!!

Below example will show the demonstration of how to use forEach; new Java 8 feature with List and Map.

        Looping Map with forEach

General way to loop a Map:

 -----------Test.java------------

import java.util.HashMap;

import java.util.Map;

import java.util.Map.Entry;

public class Test {

       public static void main(String[] args) {

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

              items.put(1, "One");

              items.put(2, "Two");

              items.put(3, "Three");

              items.put(4, "four");

              items.put(5, "five");

              for (Entry<Integer, String> entry : items.entrySet()) {

System.out.println("Item : " + entry.getKey() + " Count : " + entry.getValue());

              }

       }

}

Output:

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

Item : 1 Count : One

Item : 2 Count : Two

Item : 3 Count : Three

Item : 4 Count : four

Item : 5 Count : five

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

Looping Map with forEach, 

 

Actually in Java 8, we can loop by using lambda expression

 

 Code:

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

import java.util.HashMap;

import java.util.Map;

public class Test {

       public static void main(String[] args) {

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

              items.put(1, "One");

              items.put(2, "Two");

              items.put(3, "Three");

              items.put(4, "four");

              items.put(5, "five");

              items.forEach((k,v)->System.out.println("Item : " + k + " Count : " + v));

             

       }

}

Output:

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

Item : 1 Count : One

Item : 2 Count : Two

Item : 3 Count : Three

Item : 4 Count : four

Item : 5 Count : five

Also check: List example with forEach