Question about lesson 1-7, slide 2: Iterable.forEach () and parallel execution

As stated in the previous parts of this lesson, the library can choose to run lambda expressions in parallel.

In the example: the final execution using Iterable.forEach () result will be same as using a traditional loop?

Using a traditional loop that you are sure that the items in the list are printed in the order they are in the list.

This is not always true using Iterable.forEach (), since the items could be printed by different threads?

"... the library can choose to perform lambda expressions in parallel."

I wanted to clarify a little.

The general rule is that parallel execution can occur if the particular library used API allows him, and it is usually under the control of the programmer. For example, lambdas in parallel flow (which will be addressed later in the MOOC) can be run in parallel, but the programmer must explicitly request parallelism. If the API says nothing about parallel (or asynchronous) execution, then those that don't occur.

If Iterable.forEach runs sequentially, and the underlying class specified an order, the execution will take place in this order.

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