openJDK之lambda——List的forEach如何实现的

@Test
public void test1() {
    List<Integer> integers = Arrays.asList(1, 4, 7, 9, 20, 3, 5, -1, -7, 10);
    integers.forEach(i->{
        System.out.println(i);
    });
}

/**
    * Performs the given action for each element of the {@code Iterable}
    * until all elements have been processed or the action throws an
    * exception.  Unless otherwise specified by the implementing class,
    * actions are performed in the order of iteration (if an iteration order
    * is specified).  Exceptions thrown by the action are relayed to the
    * caller.
    *
    * @implSpec
    * <p>The default implementation behaves as if:
    * <pre>{@code
    *     for (T t : this)
    *         action.accept(t);
    * }</pre>
    *
    * @param action The action to be performed for each element
    * @throws NullPointerException if the specified action is null
    * @since 1.8
    */
default void forEach(Consumer<? super T> action) {
    Objects.requireNonNull(action);
    for (T t : this) {
        action.accept(t);
    }
}

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