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Showing content from http://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/stream/Stream.Builder.html below:

Stream.Builder (Java SE 15 & JDK 15)

Type Parameters:

T - the type of stream elements

All Superinterfaces:

Consumer<T>

Enclosing interface:

Stream<T>

public static interface Stream.Builder<T>
extends Consumer<T>

A mutable builder for a

. This allows the creation of a

by generating elements individually and adding them to the

(without the copying overhead that comes from using an

as a temporary buffer.)

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.

Since:

1.8

See Also:

Stream.builder()

• Method Summary Modifier and Type Method Description void accept​(T t)

  Adds an element to the stream being built.

  default Stream.Builder<T> add​(T t)

  Adds an element to the stream being built.

  Stream<T> build()

  Builds the stream, transitioning this builder to the built state.

• Method Details
  • accept

    Adds an element to the stream being built.

    Specified by:

    accept in interface Consumer<T>

    Parameters:

    t - the input argument

    Throws:

    IllegalStateException - if the builder has already transitioned to the built state

  • add

    Adds an element to the stream being built.

    Implementation Requirements:

    The default implementation behaves as if:

    
         accept(t)
         return this;
     

    Parameters:

    t - the element to add

    Returns:

    this builder

    Throws:

    IllegalStateException - if the builder has already transitioned to the built state

  • build

    Builds the stream, transitioning this builder to the built state. An IllegalStateException is thrown if there are further attempts to operate on the builder after it has entered the built state.

    Returns:

    the built stream

    Throws:

    IllegalStateException - if the builder has already transitioned to the built state

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