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Primitive type Stream example.


In java collection framework works with objects, not with primitive types. In order to use primitive with collections, we need to depend on wrapper classes. In Java 8 Stream, we don't need to worry about handling primitive data. Java 8 Stream API provides below Interfaces to support primitive type in Stream.

IntStream is a sequence of primitive int-valued elements supporting sequential and parallel aggregate operations. This is the int primitive specialization of Stream.

LongStream is a sequence of primitive long-valued elements supporting sequential and parallel aggregate operations. This is the long primitive specialization of Stream.

DoubleStream is a sequence of primitive double-valued elements supporting sequential and parallel aggregate operations. This is the double primitive specialization of Stream.

package com.java2novice.streams;

import java.util.Arrays;
import java.util.stream.DoubleStream;
import java.util.stream.IntStream;

public class PrimitiveStreamEx {

	public static void main(String a[]) {

		IntStream inStrm = IntStream.of(10, 20, 30, 40);
		System.out.println("----- IntStream -----");
		inStrm.forEach(System.out::println);

		double[] results = {98.12, 72.17, 75.20, 68.6};
		DoubleStream resultStream = Arrays.stream(results);
		System.out.println("----- DoubleStream -----");
		resultStream.forEach(System.out::println);
	}
}

Output:
----- IntStream -----
10
20
30
40
----- DoubleStream -----
98.12
72.17
75.2
68.6
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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.
Knowledge Centre
Procedural Vs Object-oriented Programs
In procedural program, programming logic follows certain procedures and the instructions are executed one after another. In OOP program, unit of program is object, which is nothing but combination of data and code.

In procedural program, data is exposed to the whole program whereas in OOPs program, it is accessible with in the object and which in turn assures the security of the code.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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