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forEach Example Java 8

dissertation statistical services in uk in ct - Let us help with your Master thesis. Essays & researches written by top quality writers. Entrust your papers to the most In this post, we will show you how to use forEach with List and a Map using the new Java 8 forEach statement.

The old pros may appreciate this http://ksi-nuevo.com/?essay-subject, but it's really for new writers between assignments. The key to a successful writing career is Prior to Java 8, here are the normal ways to iterate over a Map and java.util.List:

1. for-loop and Map example:

online essay critique multi step equations with fractions and decimals homework help Binding essay crime doesnt pay bonamy dobree english essayists import java.util.HashMap; import java.util.Map; public class IterateExample { public static void main(String[] args) { Map<String, Integer> animals = new HashMap<>(); animals.put("lion", 10); animals.put("tiger", 20); animals.put("zebra", 30); animals.put("monkey", 40); animals.put("panda", 50); animals.put("Giraffe", 60); for (Map.Entry<String, Integer> entry : animals.entrySet()) { System.out.println("Animal : " + entry.getKey() + " Count : " + entry.getValue()); } } }

OUTPUT:

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2. for-loop and List example:

The Smart Writers is one of the most renowned online site in UK. Besides being cheap in price, we maintain 100% confidentiality and a import java.util.ArrayList; import java.util.List; public class IterateListExample { public static void main(String[] args) { List<String> animals = new ArrayList<>(); animals.add("lion"); animals.add("tiger"); animals.add("zebra"); animals.add("monkey"); animals.add("panda"); animals.add("Giraffe"); for(String animal : animals){ System.out.println(animal); } } }

OUTPUT:

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Using forEach in Java 8

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As a new feature in Java 8, the forEach loop provides programmers with a simple and interesting way for iterating over a collection. Here are the examples on how to iterate over a Map and List using forEach:

1. Map with forEach + lambda expression.

import java.util.HashMap;
import java.util.Map;

public class IterateForEachMapExample {
	public static void main(String[] args) {
		Map<String, Integer> animals = new HashMap<>();
		animals.put("lion", 10);
		animals.put("tiger", 20);
		animals.put("zebra", 30);
		animals.put("monkey", 40);
		animals.put("panda", 50);
		animals.put("Giraffe", 60);
	
		System.out.println("// Iterating over a Map using Map’s forEach");
		animals.forEach((key, value) -> System.out.println("animal : " + key + " count : " + value));
		
		System.out.println("// Iterating over a Map by iterating entrySet");
		animals.entrySet().forEach(entry -> System.out.println(entry.getKey() + " " + entry.getValue()));

	}
}

OUTPUT:


// Iterating over a Map using Map’s forEach
animal : zebra count : 30
animal : panda count : 50
animal : monkey count : 40
animal : tiger count : 20
animal : lion count : 10
animal : Giraffe count : 60
// Iterating over a Map by iterating entrySet
zebra 30
panda 50
monkey 40
tiger 20
lion 10
Giraffe 60

2. List with forEach + Lambda Expression or Method Reference.

import java.util.ArrayList;
import java.util.List;

public class IterateForEachListExample {
	public static void main(String[] args) {
		List<String> animals = new ArrayList<>();
		animals.add("lion");
		animals.add("tiger");
		animals.add("zebra");
		animals.add("monkey");
		animals.add("panda");
		animals.add("Giraffe");
		
		System.out.println("// Using Lambda expression");
		animals.forEach(animal->System.out.println(animal));
		
		System.out.println("// Using method reference");
		animals.forEach(System.out::println);
		
	}
}

OUTPUT:


// Using Lambda expression
lion
tiger
zebra
monkey
panda
Giraffe
// Using method reference
lion
tiger
zebra
monkey
panda
Giraffe

That”s all folks! Hope it helps! Happy Learning!

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33 Comments

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