Collections - Beginning Java 8 Language Features - page 526

Using the forEach() Method
The Iterable interface contains a new forEach(Consumer<? super T> action) method that you can use in all
collection types that inherit from the Collection interface. The method iterates over all elements and applies the action.
It works similar to the forEachRemaining(Consumer<? super E> action) method of the Iterator interface with a
difference that the Iterable.forEach() method iterates over all elements whereas the Iterator.forEachRemaining()
method iterates over the elements in the collections that have not yet been retrieved by the Iterator .
The forEach() method is available in all collection types that inherit from the Collection interface. Listing 12-4
shows how to use the forEach() method to print all elements of a list of strings. Notice that using the forEach()
method is the most compact way of iterating over elements of a collection.

■ the Iterator is the fundamental (and a little cumbersome) way of iterating over elements of a collection. it has
existed since the beginning. all other ways, such as the for-each loop, the forEach() method, and the forEachRemaining()
method, are syntactic sugar for the Iterator . internally, they all use an Iterator .

Tip

Listing 12-4. Using the forEach() Method of the Iterable Interface to Iterate Over Elements of a List

// ForEachMethod.java
package com.jdojo.collections;

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

public class ForEachMethod {
public static void main(String[] args) {
// Create a list of strings
List<String> names = new ArrayList<>();
// Add some names to the list
names.add("Ken");
names.add("Lee");
names.add("Joe");
// Print all elements of the names list
names.forEach(System.out::println);
}
}

Ken
Lee
Joe