Table of Content

How to search element in Object Array using Index in Java?

Declaration :

Explanation :

Purpose The java.util.Arrays.binarySearch(Object[] a int fromIndex int toIndex Object key) method searches a range of the specified array for the specified object using the binary search algorithm.The range must be sorted into ascending order according to the natural ordering of its elements before making this call.If it is not sorted the results are undefined.
Parameters a ===> This is the array to be searched.
fromIndex ===> This is the index of the first element (inclusive) to be searched.
toIndex ===> This is the index of the last element (exclusive) to be searched.
key ===> This is the value to be searched for.
Return Value This method returns index of the search key if it is contained in the array else it returns (-(insertion point) – 1). The insertion point is the point at which the key would be inserted into the array; the index of the first element in the range greater than the key or toIndex if all elements in the range are less than the specified key.
Exception ClassCastException — if the search key is not comparable to the elements of the array within the specified range.
,IllegalArgumentException — if fromIndex > toIndex
,ArrayIndexOutOfBoundsException — if fromIndex < 0 or toIndex > a.length

Java Program : Example

Below example will explain java.util.Arrays.binarySearch() method.

Output of Program :