Assume that bands is an ArrayList of String objects, which contains a number of elements in ascending order.Select a statement to complete the code segment below, which invokes the Java library binarySearch method to search for the string "Beatles".If the list does not already contain the string, it should be inserted in an appropriate location so that the list remains sorted.
A)bands.add(-1 * index, "Beatles");
B)bands.add(-1 - index, "Beatles");
C)bands.add(-1 * index + 1, "Beatles");
D)bands.add(index + 1, "Beatles");

Question

Assume that bands is an ArrayList of String objects, which contains a number of elements in ascending order.Select a statement to complete the code segment below, which invokes the Java library binarySearch method to search for the string "Beatles".If the list does not already contain the string, it should be inserted in an appropriate location so that the list remains sorted.  
A)bands.add(-1 * index, "Beatles"); 
B)bands.add(-1 - index, "Beatles"); 
C)bands.add(-1 * index + 1, "Beatles"); 
D)bands.add(index + 1, "Beatles");

Quizplus · Accepted Answer

According to the documentation of binarySearch method, if the target element is not in the list, the method returns the "insertion point" - the index at which the target element should be inserted to maintain sorted order. So, in order to insert "Beatles" at the correct location, we need to add it at the index that is the negation of the insertion point minus 1, which can be expressed as -1 - index. Therefore, the correct choice is B.

Assume That Bands Is an ArrayList of String Objects, Which