Java OCA OCP Practice Question 2779

Question

What is the result of the following? 

DoubleStream s = DoubleStream.of(1.2, 2.4); 
s.peek(System.out::println).filter(x -> x > 2).count();
  • A. 1
  • B. 2
  • C. 2.4
  • D. 1.2 and 2.4
  • E. There is no output.
  • F. The code does not compile.
  • G. An exception is thrown.


D.

Note

The terminal operation is count().

Since there is a terminal operation, the intermediate operations run.

The peek() operation comes before the filter, so both numbers are printed.

The count happens to be 1 since the other number is filtered.

However, the result of the stream pipeline isn't stored in a variable, and that result is ignored.




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