How to use range and reduce method of IntStream | Java 8 streams | Streams in Java 8

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StreamDemo.java

import java.util.OptionalInt;
import java.util.stream.IntStream;

public class StreamDemo
{
    public static void main(String[] args)
    {
        /*
         * sum = 6 (1 + 2 + 3)
         */
        OptionalInt optionalInt = IntStream.range(1, 4).reduce((a, b) -> a + b);
        
        System.out.println(optionalInt.getAsInt());
        
        /*
         * sum = 16 (10 + 1 + 2 + 3)
         */
        int sum = IntStream.range(1, 4).reduce(10, (a, b) -> a + b);
        
        System.out.println(sum);
    }

}

Output

6
16

Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/StreamDemo_range_reduce.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StreamDemo_range_reduce

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/adf72ea7a150b1a34af5820c19f2232b522614b9/BasicJava/StreamDemo_range_reduce/?at=master

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