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DoubleStream noneMatch() in Java with examples
  • Last Updated : 06 Dec, 2018

DoubleStream noneMatch(DoublePredicate predicate) returns whether no elements of this stream match the provided predicate. It may not evaluate the predicate on all elements if not necessary for determining the result. This is a short-circuiting terminal operation. A terminal operation is short-circuiting if, when presented with infinite input, it may terminate in finite time.
Syntax :

boolean noneMatch(DoublePredicate predicate)

Where, DoublePredicate represents a predicate 
(boolean-valued function) of one double-valued argument.

Return Value : The function returns true if either all elements of the stream match the provided predicate or the stream is empty, otherwise false.

Note : If the stream is empty then true is returned and the predicate is not evaluated.

Example 1 : noneMatch() function to check whether no element of DoubleStream is divisible by 5.




// Java code for DoubleStream noneMatch
// (DoublePredicate predicate) to check whether
// no element of this stream match
// the provided predicate.
import java.util.*;
import java.util.stream.DoubleStream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
        // Creating an DoubleStream
        DoubleStream stream =
              DoubleStream.of(3.2, 5.0, 9.3, 12.4, 14.7);
  
        // Check if no element of stream
        // is divisible by 5 using
        // DoubleStream noneMatch(DoublePredicate predicate)
        boolean answer =
             stream.noneMatch(num -> num % 5 == 0);
  
        // Displaying the result
        System.out.println(answer);
    }
}
Output:



false

Example 2 : noneMatch() function to check whether no element in the DoubleStream obtained after concatenating two DoubleStreams is less than 2.




// Java code for DoubleStream noneMatch
// (DoublePredicate predicate) to check whether
// no element of this stream match
// the provided predicate.
import java.util.*;
import java.util.stream.DoubleStream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
        // Creating an DoubleStream after
        // concatenating two DoubleStreams
        DoubleStream stream = DoubleStream.concat(
            DoubleStream.of(3.3, 4.2, 5.1, 6.6),
            DoubleStream.of(7.2, 8.3, 9.1, 10.5));
  
        // Check if no element of stream
        // is less than 2 using
        // DoubleStream noneMatch(DoublePredicate predicate)
        boolean answer = stream.noneMatch(num -> num < 2);
  
        // Displaying the result
        System.out.println(answer);
    }
}
Output:
true

Example 3 : noneMatch() function to show if the stream is empty then true is returned.




// Java code for DoubleStream noneMatch
// (DoublePredicate predicate) to check whether
// no element of this stream match
// the provided predicate.
import java.util.*;
import java.util.stream.DoubleStream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
        // Creating an empty DoubleStream
        DoubleStream stream = DoubleStream.empty();
  
        // Using DoubleStream noneMatch() on empty stream
        boolean answer = stream.noneMatch(num -> true);
  
        // Displaying the result
        System.out.println(answer);
    }
}
Output:
true

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