In connection to self test question no. 9 at the end of chapter 7 in the SCJP 1.5 book by K&B.
Please Elucidate the following answer:-
Given a properly prepared String array containing five elements, which range of results could a proper invocation of Arrays.binarySearch() produce? A. 0 through 4 B. 0 through 5 C. -1 through 4 D. -1 through 5 E. -5 through 4 F. -5 through 5 G. -6 through 4 H. -6 through 5
Answer: G is correct. If a match is found, binarySearch()will return the index of the element that was matched. If no match is found, binarySearch() will return a negative number that,if inverted and then decremented, gives you the insertion point (array index) at which the value searched on should be inserted into the array to maintain a proper sort.
If we are having 5 elements in the list means the index starts from 0 and ends with 4 ok And these are strings means they are sorted properly ok now you are searching an element,and that element was not there. then what you will get an insertinon as -6,invert and then decremented -1 that gives us index,where that element would be there.