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Functional Java is an open source library that supports closures for the Java programming language

There is a newer version: 4.8.1

package fj.data;

import java.util.stream.Collector;

public final class Collectors {

  private Collectors() {
  }

  public static  Collector, List> toList() {
    return Collector.of(
        List.Buffer::new,
        List.Buffer::snoc,
        (acc1, acc2) -> acc1.append(acc2.toList()),
        List.Buffer::toList
    );
  }

  public static  Collector, Array> toArray() {
    return Collector.of(
        List.Buffer::new,
        List.Buffer::snoc,
        (acc1, acc2) -> acc1.append(acc2.toList()),
        (buf) -> Array.iterableArray(buf.toList())
    );
  }

  public static  Collector, Stream> toStream() {
    return Collector.of(
        List.Buffer::new,
        List.Buffer::snoc,
        (acc1, acc2) -> acc1.append(acc2.toList()),
        (buf) -> Stream.iterableStream(buf.toList())
    );
  }
}

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