Java OCA OCP Practice Question 2767

Question

What changes need to be made for this code to print the string 12345? (Choose all that apply.) 

Stream.iterate(1, x -> x++).limit(5).map(x -> x).collect(Collectors.joining());
  • A. Change Collectors.joining() to Collectors.joining("").
  • B. Change map(x -> x) to map(x -> "" + x) .
  • C. Change x -> x++ to x -> ++x.
  • D. Add forEach(System.out::print) after the call to collect().
  • E. Wrap the entire line in a System.out.print statement.
  • F. None of the above. The code already prints 12345.


B, C, E.

Note

As written, the code doesn't compile because the collector expects to get a String immediately before it in the chain.

Option B fixes this, at which point nothing is output because the collector creates a String.

Option E fixes this and causes the output to be 11111.

Since the post-increment operator is used, the stream contains an infinite number of 1s.

Option C fixes this and causes the stream to contain increasing numbers.




PreviousNext

Related