DoubleStream count() returns the count of elements in the stream. DoubleStream count() is present in java.util.stream.DoubleStream. This is a special case of a reduction i.e, it takes a sequence of input elements and combines them into a single summary result.
Syntax :
long count()
Note : This is a terminal operation i.e, it may traverse the stream to produce a result or a side-effect. After the terminal operation is performed, the stream pipeline is considered consumed, and can no longer be used.
Example 1 : Count the elements in DoubleStream.
// Java code for DoubleStream count()// to count the number of elements in// given streamimport java.util.*;import java.util.stream.DoubleStream; class GFG { // Driver code public static void main(String[] args) { // creating a DoubleStream DoubleStream stream = DoubleStream.of(2.3, 3.4, 4.5, 5.6, 6.7, 7.8, 8.9); // storing the count of elements // in a variable named total long total = stream.count(); // displaying the total number of elements System.out.println(total); }} |
Output:
7
Example 2 : Count distinct elements in DoubleStream.
// Java code for DoubleStream count()// to count the number of distinct// elements in given streamimport java.util.*;import java.util.stream.DoubleStream; class GFG { // Driver code public static void main(String[] args) { // creating a DoubleStream DoubleStream stream = DoubleStream.of(2.2, 3.3, 4.4, 4.4, 7.6, 7.6, 8.0); // storing the count of distinct elements // in a variable named total long total = stream.distinct().count(); // displaying the total number of elements System.out.println(total); }} |
Output:
5
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