Java 8 forEach

by Online Tutorials Library July 14, 2022

Java forEach loop

Java provides a new method forEach() to iterate the elements. It is defined in Iterable and Stream interface. It is a default method defined in the Iterable interface. Collection classes which extends Iterable interface can use forEach loop to iterate elements.

This method takes a single parameter which is a functional interface. So, you can pass lambda expression as an argument.

forEach() Signature in Iterable Interface

Java 8 forEach() example 1

 import java.util.ArrayList; import java.util.List; public class ForEachExample { public static void main(String[] args) { List<String> gamesList = new ArrayList<String>(); gamesList.add(“Football”); gamesList.add(“Cricket”); gamesList.add(“Chess”); gamesList.add(“Hocky”); System.out.println(“————Iterating by passing lambda expression————–“); gamesList.forEach(games -> System.out.println(games));  } } 

Output:

------------Iterating by passing lambda expression-------------- Football Cricket Chess Hocky

Java 8 forEach() example 2

 import java.util.ArrayList; import java.util.List; public class ForEachExample { public static void main(String[] args) { List<String> gamesList = new ArrayList<String>(); gamesList.add(“Football”); gamesList.add(“Cricket”); gamesList.add(“Chess”); gamesList.add(“Hocky”); System.out.println(“————Iterating by passing method reference—————“); gamesList.forEach(System.out::println); } } 

Output:

------------Iterating by passing method reference--------------- Football Cricket Chess Hocky

Java Stream forEachOrdered() Method

Along with forEach() method, Java provides one more method forEachOrdered(). It is used to iterate elements in the order specified by the stream.

Singnature:

Java Stream forEachOrdered() Method Example

 import java.util.ArrayList; import java.util.List; public class ForEachOrderedExample { public static void main(String[] args) { List<String> gamesList = new ArrayList<String>(); gamesList.add(“Football”); gamesList.add(“Cricket”); gamesList.add(“Chess”); gamesList.add(“Hocky”); System.out.println(“————Iterating by passing lambda expression—————“); gamesList.stream().forEachOrdered(games -> System.out.println(games)); System.out.println(“————Iterating by passing method reference—————“); gamesList.stream().forEachOrdered(System.out::println); }  } 

Output:

------------Iterating by passing lambda expression--------------- Football Cricket Chess Hocky ------------Iterating by passing method reference--------------- Football Cricket Chess Hocky

Next TopicJava 8 Collectors

Java 8 forEach

Java forEach loop

forEach() Signature in Iterable Interface

Java 8 forEach() example 1

Java 8 forEach() example 2

Java Stream forEachOrdered() Method

Singnature:

Java Stream forEachOrdered() Method Example

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