RetroSearch Browse

Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://www.geeksforgeeks.org/java/doublestream-builder-build-in-java/ below:

DoubleStream.Builder build() in Java - GeeksforGeeks

DoubleStream.Builder build() in Java

Last Updated : 06 Dec, 2018

DoubleStream.Builder build() builds the stream, transitioning this builder to the

built state

Syntax :

DoubleStream build()

Return Value:

This method returns the built stream.

Note:

A stream builder has a lifecycle, which starts in a

building phase

, during which elements can be added, and then transitions to a

built phase

, after which elements may not be added. The built phase begins when the build() method is called, which creates an ordered stream whose elements are the elements that were added to the stream builder, in the order they were added. Below are the examples to illustrate build() method:

Example 1: Java


 // Java code to show the implementation
// of DoubleStream.Builder build()

import java.util.stream.DoubleStream;

class GFG {

    // Driver code
    public static void main(String[] args)
    {

        // Creating a Stream in building phase
        DoubleStream.Builder b = DoubleStream.builder();

        // Adding elements into the stream
        b.add(1.2);
        b.add(2.4);
        b.add(3.87);
        b.add(4.78);

        // Constructing the built stream using build()
        // This will enter the stream in built phase
        b.build().forEach(System.out::println);
    }
}

Output:

1.2
2.4
3.87
4.78

Example 2:

Trying to add element in after calling build() method (when stream is in built phase).

Java


 // Java code to show the implementation
// of DoubleStream.Builder build()

import java.util.stream.DoubleStream;

class GFG {

    // Driver code
    public static void main(String[] args)
    {
        // Creating a Stream in building phase
        DoubleStream.Builder b = DoubleStream.builder();

        // Adding elements into the stream
        b.add(1.2);
        b.add(2.4);
        b.add(3.87);
        b.add(4.78);

        // Constructing the built stream using build()
        // This will enter the stream in built phase
        // Now no more elements can be added to this stream
        b.build().forEach(System.out::println);

        // Trying to add more elements in built phase
        // This will cause exception
        try {
            b.add(50.547);
        }
        catch (Exception e) {
            System.out.println("\nException: " + e);
        }
    }
}

Output:

1.2
2.4
3.87
4.78

Exception: java.lang.IllegalStateException

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4