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

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

Syntax:

DoubleStream java.util.Arrays.stream(double[] array, int startInclusive, int endExclusive)

This method takes three arguments one of type double array and the rest two are of type int as its parameters. This method returns a sequential DoubleStream with the specified range of the specified array as its source.

Parameters: Three parameters are required for this method.

array: the array, assumed to be unmodified during use.

startInclusive: the first index to cover, inclusive.

endExclusive: index immediately past the last index to cover.

Returns: a DoubleStream for the array range.

Throws:

1. ArrayIndexOutOfBoundsException - if startInclusive is negative, endExclusive is less than startInclusive, or endExclusive is greater than the array size.

Approach 1: When no exceptions

Java

import java.util.Arrays;

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

        double array[] = { 1, 2, 10, 5, 7, 8, 9 };

        int startInclusive = 1, endExclusive = 4;

        System.out.println(Arrays.stream(array, 
          startInclusive, endExclusive).count());
    }
}

Output:

3

Approach 2: ArrayIndexOutOfBoundsException 

Java

import java.util.Arrays;

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

        double array[] = { 1, 2, 10, 5, 7, 8, 9 };

        int startInclusive = -1, endExclusive = 4;

        System.out.println(Arrays.stream(array, 
           startInclusive, endExclusive).count());
    }
}

Output:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Array index out of range: -1
	at java.base/java.util.Spliterators.checkFromToBounds(Spliterators.java:391)
	at java.base/java.util.Spliterators.spliterator(Spliterators.java:371)
	at java.base/java.util.Arrays.spliterator(Arrays.java:5413)
	at java.base/java.util.Arrays.stream(Arrays.java:5536)