JAVA CERTIFICATION QUESTION: Stream data filter

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JAVA CERTIFICATION QUESTION: Stream data filter

=>Filtering a stream returns a stream consisting of the elements of this stream that match the given predicate.

· java

Given

1. import java.util.stream.DoubleStream;
2.
3. public class TestDoubleSTream{
4. 
5.   public static void main(String[] args){
6.
7.      DoubleStream doubles = DoubleStream.of(0.45,0.42,0.49);
8.      System.out.print(doubles.filter(e->e>0.45).count());
9.   }
10.}

 What is the output?

A) 1
B) 2
C) Compilation fails since we haven't imported predicate.
D) Compilation fails due to error at line 7.
E) Compilation fails due to error at line 8.

#java #certificationquestion #ocp

JavaDoc

 At line 7, we have created a DoubleStream with three doubles.

At line 8 we have used the filter method which lets pass only the values matching values strictly greater than 0.45.

So when count invoked, filter will result a stream with single value.

Hence the number of elements in the stream which count invoked is 1.

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