Java 8 | forEach with examples

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In this tutorial let us learn about Java 8 forEach with examples.

The main use of forEach is to iterate over a collection. There are multiple ways to iterate a collection but in Java 8, the new forEach statement has made it look so simple and legible.

Please refer How to use forEach for more information.

Iterate a list – Example

Prior to Java 8,below is the way to iterate a list of objects.

List<String> list = new ArrayList<String>();
list.add("Item 1");
list.add("Item 2");
list.add("Item 3");
list.add("Item 4");

for (String str : list) {

But now, forEach can be used to iterate a list.

list.forEach(item -> System.out.println(item));

In the above code ,we have used lambda expression with forEach to iterate and print the elements of list.We can further shorten the code by using method reference.


Please refer Iterate a list using forEach for more examples.

Iterate a map – Example

Prior to Java 8,below is the way to iterate a map

Map<Integer, String> map = new HashMap<>();
map.put(1, "Text 1");
map.put(2, "Text 2");
map.put(3, "Text 3");

for (Entry<Integer, String> entry : map.entrySet()) {
	System.out.println("Key :" + entry.getKey() + " value : " + entry.getValue());

By using forEach,

map.forEach((key, value) -> System.out.println("Key :" + key + " value : " + value));

Please refer Iterate a map using forEach for more examples.

Please refer External iterator vs internal iterators to know how forEach controls iteration.

Java 8 forEach official documentation.

Thanks for reading.Please provide your valuable comments.

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