Stream forEach() method in Java with examples

The Stream.forEach(Consumer action) method performs a given action on each element of the stream. It is a terminal operation, which may traverse the stream to produce a result or a side effect.

Example:

12345

Explanation:

• numbers.stream() creates a stream from the list.
• forEach(System.out::println) prints each number.

Syntax

void forEach(Consumer<? super T> action)

• Parameters: "action" a Consumer functional interface defining the operation to perform on each element.
• Return Value: None (void) - this is a terminal operation.

Example 1: Print Each Element of a Reversely Sorted Integer Stream

10
8
6
4
2

Explanation:

• sorted(Comparator.reverseOrder()) sorts the elements in descending order.
• forEach(System.out::println) prints each element of the stream.

Example 2: Print Each Element of a String Stream

GFG
Geeks
for
GeeksforGeeks

Explanation: forEach(System.out::println) applies the print operation to each element.

Example 3: Print Character at Index 1 from Reversely Sorted String Stream

o
e
e
F

Explanation:

• sorted(Comparator.reverseOrder()) sorts the strings in descending order.
• flatMap(str -> Stream.of(str.charAt(1))) extracts the character at index 1 from each string.
• forEach(System.out::println) prints each extracted character.