Arrays.binarySearch(double[], int, int,double) in Java

Arrays.binarySearch(double[], int, int,double): This method is available in java.util.Arrays class of Java.

Syntax:

int java.util.Arrays.binarySearch(double[] a, int fromIndex, int toIndex, double key)

This method takes four arguments, one of type double array, two are of type int and the one is of type double as its parameters. This method searches a range of the specified array of doubles for the specified value

Note: The range must be sorted

Parameters: Four parameters are required for this method.

a: the array to be searched.

fromIndex: the index of the first element (inclusive) to be searched.

toIndex: the index of the last element (exclusive) to be searched.

key: the value to be searched for.

Returns: index of the search key, if it is contained in the array within the specified range; otherwise,(-(insertion point) - 1).

Note: The insertion point is defined as 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.

Throws:

1. IllegalArgumentException - if fromIndex > toIndex.

2. ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length

Approach 1: When no exceptions

Java

Output:

2

Approach 2: IllegalArgumentException 

Java

import java.util.Arrays;

public class ArraysbinarySearchdoubleRange {
    public static void main(String[] args) {

        // for type double
        double doubleArray[] = { 13.45, 45.67, 234.89, 2727.90, 
                                   8919.90 };
        double doubleKey = 234.89;

        int fromIndex = 6, toIndex = 4;

        // to ensure array is sorted
        Arrays.sort(doubleArray);
        System.out.println(Arrays.binarySearch(doubleArray, 
                             fromIndex, toIndex, doubleKey));
    }
}

Output:

Exception in thread "main" java.lang.IllegalArgumentException: fromIndex(6) > toIndex(4)
	at java.base/java.util.Arrays.rangeCheck(Arrays.java:718)
	at java.base/java.util.Arrays.binarySearch(Arrays.java:2021)
	

Approach 3: ArrayIndexOutOfBoundsException

Java

import java.util.Arrays;

public class ArraysbinarySearchdoubleRange {
    public static void main(String[] args) {

        // for type double
        double doubleArray[] = { 13.45, 45.67, 234.89, 
                               2727.90, 8919.90 };
        double doubleKey = 234.89;

        int fromIndex = 2, toIndex = 7;

        // to ensure array is sorted
        Arrays.sort(doubleArray);
        System.out.println(Arrays.binarySearch(doubleArray,
                  fromIndex, toIndex, doubleKey));
    }
}

Output:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 7
	at java.base/java.util.Arrays.rangeCheck(Arrays.java:725)
	at java.base/java.util.Arrays.binarySearch(Arrays.java:2021)