IntStream.Builder (Java SE 12 & JDK 12 )
Keywords: java.util.stream.IntStream.Builder interface

Module java.base
Package java.util.stream

## Interface IntStream.Builder

- All Superinterfaces:
    `IntConsumer`
  Enclosing interface:
    IntStream

      public static interface IntStream.Builder
      extends IntConsumer

  A mutable builder for an `IntStream`.

  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:
    `IntStream.builder()`

- - ### Method Summary

    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | `accept​(int t)` | Adds an element to the stream being built.
    `default IntStream.Builder` | `add​(int t)` | Adds an element to the stream being built.
    `IntStream` | `build()` | Builds the stream, transitioning this builder to the built state.

    - ### Methods declared in interface java.util.function.IntConsumer

      `andThen`

- - ### Method Detail

    - #### accept

          void accept​(int t)

      Adds an element to the stream being built.
      Specified by:
        `accept` in interface `IntConsumer`
      Parameters:
        `t` - the input argument
      Throws:
        `IllegalStateException` - if the builder has already transitioned to the built state

    - #### add

          default IntStream.Builder add​(int t)

      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

          IntStream 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