Java OCA OCP Practice Question 2713

Question

What is the result of the following code? 

Comparator<Integer> c = (o1, o2) -> o2-o1; 
List<Integer> list = Arrays.asList(5, 4, 7, 1); 
Collections.sort(list, c); 
System.out.println(Collections.binarySearch(list, 1));
  • A. 0
  • B. 1
  • C. 2
  • D. The result is undefined.
  • E. The code does not compile.
  • F. A runtime exception is thrown.


D.

Note

The list is sorted in descending order.

However, it is searched using the default order, which is sorted in ascending order.

binarySearch() requires both to use the same sort order.

Therefore, the precondition for binarySearch() is not met and the result is undefined.




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