Varargs

Question 1

Give the signature of the Arrays.binarySearch() method !

Answer 1

the Arrays.binarySearch method in Java does not support varargs (variable arguments) for its parameters. The binarySearch methods in the java.util.Arrays class are designed to operate on arrays with a fixed number of parameters. Specifically, binarySearch requires:

The array to search: An array of the appropriate type (int[], long[], double[], float[], short[], byte[], char[], boolean[], or T[] for objects).

The key to search for: A single value to search within the array (e.g., int key, long key, double key, etc.).

Question 2

Give the a characteristic of Arrays.binarySearch method !

Answer 2

Sorted Array Requirement: The Arrays.binarySearch method requires that the array be sorted in ascending order to function correctly

Why It Matters: Binary search is an efficient algorithm that works by repeatedly dividing the search interval in half. This method assumes that the array is sorted because it relies on the ordering of elements to determine which half of the array to search next. If the array is not sorted, the method will not provide correct results and may not even find the element if it is present.

Question 3

What is the difference between an array parameter and a vararg parameter ?

Answer 3

Declaration Syntax:
Array Parameter: type[] name
Vararg Parameter: type… name

Argument Passing:

 Array Parameter: Requires an explicit 
 array to be passed.

 Vararg Parameter: Can take a list of 
 individual arguments or an array.

Usage Flexibility:

  Array Parameter: Must be created and 
  passed as an array.

   Vararg Parameter: More flexible; can 
   handle a varying number of 
   arguments.