Java : Stream.Builder - API Examples

Stream.Builder (Java SE 18 & JDK 18) API Examples.
You will find code examples on most Stream.Builder methods.


Summary

A mutable builder for a Stream. This allows the creation of a Stream by generating elements individually and adding them to the Builder (without the copying overhead that comes from using an ArrayList as a temporary buffer.)

Class diagram

final var builder = Stream.<String>builder();

final var stream = builder.add("aaa").add("bbb").add("ccc").build();

System.out.println("-- forEach --");
stream.forEach(System.out::println);

// Result
// ↓
//-- forEach --
//aaa
//bbb
//ccc

Methods

void accept (T t)

Adds an element to the stream being built.

final var builder = Stream.<String>builder();

builder.accept("aaa");
builder.accept("bbb");
builder.accept("ccc");

final var stream = builder.build();

System.out.println("-- forEach --");
stream.forEach(System.out::println);

// Result
// ↓
//-- forEach --
//aaa
//bbb
//ccc

default Stream.Builder<T> add (T t)

Adds an element to the stream being built.

final var builder = Stream.<String>builder();

final var stream = builder.add("aaa").add("bbb").add("ccc").build();

System.out.println("-- forEach --");
stream.forEach(System.out::println);

// Result
// ↓
//-- forEach --
//aaa
//bbb
//ccc

Stream<T> build ()

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

Please see add(T t).

Methods declared in Consumer

andThen

Please see the link below.


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