Java 8 Stream peek method example.

The Stream.peek() method is mainly to support debugging, where you want to see the elements as they flow past a certain point in a pipeline.

The Stream.peek() method returns a stream consisting of the elements of this stream, additionally performing the provided action on each element as elements are consumed from the resulting stream.

For parallel stream pipelines, the action may be called at whatever time and in whatever thread the element is made available by the upstream operation. If the action modifies shared state, it is responsible for providing the required synchronization.

package com.java2novice.streams;

import java.util.stream.Collectors;
import java.util.stream.Stream;

public class StreamPeekEx {

	public static void main(String a[]) {

		Stream.of("bus", "car", "bycle", "flight", "train")
		        .filter(e -> e.length() > 3)
		        .peek(e -> System.out.println("Filtered value: " + e))
		        .map(String::toUpperCase)
		        .peek(e -> System.out.println("Mapped value: " + e))
		        .collect(Collectors.toList());
	}
}

Java 8 Streams Examples

1. How Java 8 Streams work?
2. Java 8 Streams parallelism introduction.
3. Explain non-interference behavior of Java 8 Streams.
4. Create Java 8 Stream using Stream.of() method example.
5. Create Java 8 Stream using List example.
6. Create Java 8 Stream using Stream.generate() method.
7. Java 8 Stream.filter() example.
8. Java 8 Stream.map() example.
9. Java 8 Stream flatmap method example.
10. Java 8 Stream peek method example.
11. Java 8 Stream distinct method example.
12. Java 8 Stream sorted method example.
13. Java 8 Stream limit method example.
14. Java 8 Stream forEach method example.
15. Java 8 Stream toArray method example.
16. Java 8 Stream reduce method example.
17. Java 8 Stream collect method example.
18. Java 8 Stream concat method example.
19. Java 8 Stream anyMatch(), allMatch() and noneMatch() example.
20. Java 8 Stream findFirst(), findAny() example.
21. Primitive type Stream example.