$show=/label

Java 8 Program To Boxed Stream Operations

SHARE:

A quick practical guide to Java 8 Boxed Stream Operations with examples. boxed() method converts from primitive to Wrapper objects.

1. Overview


In this tutorial, We'll learn how to convert primitives to wrapper objects in java 8. Java programs to convert a stream of int, long, double values into Collection using boxed() method.

This boxed() method is present in IntStream, LongStream, and DoubleStream primitive specialization streams.

boxed() method returns a Stream consisting of the elements of this stream, each boxed to a Wrapper.


Java 8 Program To Boxed Stream Operations




Stream of Strings:


Basically, converting String values into List works very well without any errors.

package com.javaprogramto.w3schools.programs.java8.boxed;

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

public class Java8Boxed {

    public static void main(String[] args) {

        // Creating String Stream
        Stream stringStream = Stream.of("java", "program", "to", ".com");

        // converting String's Stream to List
        List strList = stringStream.collect(Collectors.toList());

        // printing each value from list.
        System.out.println("List values are : ");
        strList.forEach(value -> System.out.println(value));

    }
}

Stream of int values into List:


        // Creating String Stream
        IntStream intStream = IntStream.of(1, 2, 3, 4, 5, 6, 7, 8, 9);

        // converting String's Stream to List
        intStream.collect(Collectors.toList());


This code will end up in a compile-time error.

The solution is boxed() method for the primitive streams.

2. IntStream.boxed() method Example


Converting primitive int to Wrapper Integer using boxed() method.

Example program to convert int stream to List of Integers:

package com.javaprogramto.w3schools.programs.java8.boxed;

import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

/**
 * Java Program To IntStream.boxed() method
 * 
 * @author JavaProgramTo.com
 *
 */
public class IntStreamBoxedExample {

    public static void main(String[] args) {

        // creating int stream
        IntStream intStream = IntStream.of(1, 2, 3, 4, 5);
        
        // using boxed() method for boxing primitive int.
        List intList = intStream.boxed().collect(Collectors.toList());

        // print list
        intList.forEach(value -> System.out.println(value));

    }

}

Output:

1
2
3
4
5


3. LongStream.boxed() method Example


Converting primitive long to Wrapper Long using boxed() method.

Example program to convert the long stream to List of Long values:

package com.javaprogramto.w3schools.programs.java8.boxed;

import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.LongStream;

/**
 * Java Program To LongStream.boxed() method
 * 
 * @author JavaProgramTo.com
 *
 */
public class LongStreamBoxedExample {

    public static void main(String[] args) {

        // creating long primitive stream
        LongStream longStream = LongStream.of(1l, 2l, 3l, 4l, 5l);

        // using boxed() method for boxing primitive long.
        List longList = longStream.boxed().collect(Collectors.toList());

        // print list
        longList.forEach(value -> System.out.println(value));

    }

}

Output:

1
2
3
4
5

4. DoubleStream.boxed() method Example


Converting primitive double to Wrapper Double using boxed() method.

Example program to convert the double stream to List of Double:

package com.javaprogramto.w3schools.programs.java8.boxed;

import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.DoubleStream;

/**
 * Java Program To DoubleStream.boxed() method
 * 
 * @author JavaProgramTo.com
 *
 */
public class DoubleStreamBoxedExample {

    public static void main(String[] args) {

        // creating double primitive stream
        DoubleStream doubleStream = DoubleStream.of(1d, 2d, 3d, 4d, 5d);

        // using boxed() method for boxing primitive long.
        List doubleList = doubleStream.boxed().collect(Collectors.toList());

        // print list
        doubleList.forEach(value -> System.out.println(value));

    }

}

Output:


1.0
2.0
3.0
4.0
5.0

5. Conclusion


In this article, We've seen how to convert primitive int, long and double streams to List of Integer, Double and Long wrapper values. Shown the examples using IntStream, DoubleStream and LongStream boxed() method.

COMMENTS

BLOGGER

About Us

Author: Venkatesh - I love to learn and share the technical stuff.
Name

accumulo,1,ActiveMQ,2,Adsense,1,API,37,ArrayList,16,Arrays,7,Bean Creation,3,Bean Scopes,1,BiConsumer,1,Blogger Tips,1,Books,1,C Programming,1,Collection,5,Collections,22,Collector,1,Command Line,1,Compile Errors,1,Configurations,7,Constants,1,Control Statements,8,Conversions,6,Core Java,81,Corona India,1,Create,2,CSS,1,Date,3,Date Time API,4,Dictionary,1,Difference,1,Download,1,Eclipse,2,Efficiently,1,Error,1,Errors,1,Exception,1,Exceptions,3,Fast,1,Files,9,Float,1,Font,1,Form,1,Freshers,1,Function,3,Functional Interface,2,Garbage Collector,1,Generics,4,Git,4,Grant,1,Grep,1,HashMap,1,HomeBrew,2,HTML,2,HttpClient,2,Immutable,1,Installation,1,Interview Questions,5,Iterate,2,Jackson API,3,Java,29,Java 10,1,Java 11,5,Java 12,5,Java 13,2,Java 14,2,Java 8,66,Java 8 Difference,2,Java 8 Stream Conversions,2,java 8 Stream Examples,3,Java 9,1,Java Conversions,11,Java Design Patterns,1,Java Files,1,Java Program,2,Java Programs,65,java.lang,5,java.util. function,1,jQuery,1,Kotlin,10,Kotlin Conversions,3,Kotlin Programs,6,Lambda,1,lang,29,Leap Year,1,live updates,1,Logging,1,Mac OS,2,Math,1,Maven,1,Method References,1,Mockito,1,MongoDB,3,New Features,1,Operations,1,Optional,6,Oracle,5,Oracle 18C,1,Partition,1,Patterns,1,Programs,1,Property,1,Python,2,Quarkus,1,Read,1,Real Time,1,Recursion,2,Remove,2,Rest API,1,Schedules,1,Serialization,1,Servlet,1,Sort,1,Sorting Techniques,8,Spring,2,Spring Boot,23,Spring Email,1,Spring MVC,1,Streams,21,String,58,String Programs,9,String Revese,1,Swing,1,System,1,Tags,1,Threads,10,Tomcat,1,Tomcat 8,1,Troubleshoot,16,Unix,2,Updates,3,util,5,While Loop,1,
ltr
item
JavaProgramTo.com: Java 8 Program To Boxed Stream Operations
Java 8 Program To Boxed Stream Operations
A quick practical guide to Java 8 Boxed Stream Operations with examples. boxed() method converts from primitive to Wrapper objects.
https://1.bp.blogspot.com/-Ix2-oyEVNt0/XffCRzyJ5XI/AAAAAAAACDQ/DQiRFuzZG8APbYlymqDed1EKhrEqo9h2QCLcBGAsYHQ/s640/Java%2B8%2BProgram%2BTo%2BBoxed%2BStream%2BOperations.png
https://1.bp.blogspot.com/-Ix2-oyEVNt0/XffCRzyJ5XI/AAAAAAAACDQ/DQiRFuzZG8APbYlymqDed1EKhrEqo9h2QCLcBGAsYHQ/s72-c/Java%2B8%2BProgram%2BTo%2BBoxed%2BStream%2BOperations.png
JavaProgramTo.com
https://www.javaprogramto.com/2019/12/java-8-boxed-stream-operations.html
https://www.javaprogramto.com/
https://www.javaprogramto.com/
https://www.javaprogramto.com/2019/12/java-8-boxed-stream-operations.html
true
3124782013468838591
UTF-8
Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS PREMIUM CONTENT IS LOCKED STEP 1: Share to a social network STEP 2: Click the link on your social network Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy Table of Content