OCP Question 50, Explanation

Which statement is true about java.util.stream.Stream?

A. A stream cannot be consumed more than once.
B. The execution mode of streams can be changed during processing.
C. Streams are intended to modify the source data.
D. A parallel stream is always faster than an equivalent sequential stream.

 

The correct answer is A.

 

From javadoc on java.util.stream package, Stream operations and pipelines section :

After the terminal operation is performed, the stream pipeline is considered consumed, and can no longer be used.

Another point – which has nothing to do with the current Problem but is hugely important for our exam in general – is that

Intermediate operations return a new stream (ibid.)

For example, peek() consumes elements by performing the specified action and then returns a new stream that consists of the exact same elements.

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