src/java.base/share/classes/java/util/stream/Collector.java

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  /*
!  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
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  /*
!  * Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
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  import java.util.function.BiConsumer;
  import java.util.function.BinaryOperator;
  import java.util.function.Function;
  import java.util.function.Supplier;
  
+ // A compilation test for the code snippets in this class-level javadoc can be found at:
+ // test/jdk/java/util/stream/test/org/openjdk/tests/java/util/stream/CollectorExample.java
+ // The test needs to be updated if the examples in this javadoc change or new examples are added.
+ 
  /**
   * A <a href="package-summary.html#Reduction">mutable reduction operation</a> that
   * accumulates input elements into a mutable result container, optionally transforming
   * the accumulated result into a final representation after all input elements
   * have been processed.  Reduction operations can be performed either sequentially
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   *
   * @apiNote
   * Performing a reduction operation with a {@code Collector} should produce a
   * result equivalent to:
   * <pre>{@code
!  *     R container = collector.supplier().get();
   *     for (T t : data)
   *         collector.accumulator().accept(container, t);
   *     return collector.finisher().apply(container);
   * }</pre>
   *
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   *
   * @apiNote
   * Performing a reduction operation with a {@code Collector} should produce a
   * result equivalent to:
   * <pre>{@code
!  *     A container = collector.supplier().get();
   *     for (T t : data)
   *         collector.accumulator().accept(container, t);
   *     return collector.finisher().apply(container);
   * }</pre>
   *