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Stream anyMatch() in Java with examples

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  • Difficulty Level : Easy
  • Last Updated : 06 Dec, 2018
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Stream anyMatch(Predicate predicate) returns whether any 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 anyMatch(Predicate<? super T> predicate)

Where, T is the type of the input to the predicate
and the function returns true if any elements of
the stream match the provided predicate, 
otherwise false.

Note : If the stream is empty then false is returned and the predicate is not evaluated.
Below given are some examples to understand the implementation of the function in a better way.

Example 1 : anyMatch() function to check whether any element in list satisfy given condition.




// Java code for Stream anyMatch
// (Predicate predicate) to check whether 
// any element of this stream match 
// the provided predicate.
import java.util.*;
  
class GFG {
      
    // Driver code
    public static void main(String[] args) {
          
    // Creating a list of Integers
    List<Integer> list = Arrays.asList(3, 4, 6, 12, 20);
   
    // Stream anyMatch(Predicate predicate) 
    boolean answer = list.stream().anyMatch(n
                     -> (n * (n + 1)) / 4 == 5);
      
    // Displaying the result
    System.out.println(answer);
}
}

Output :

true

Example 2 : anyMatch() function to check whether any element in list having UpperCase at 1st index.




// Java code for  Stream anyMatch
// (Predicate predicate) to check whether
// any element of this stream match
// the provided predicate.
import java.util.stream.Stream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
  
        // Creating a Stream of Strings
        Stream<String> stream = Stream.of("Geeks", "fOr",
                                          "GEEKSQUIZ", "GeeksforGeeks");
  
        // Check if Character at 1st index is
        // UpperCase in any string or not using
        // Stream anyMatch(Predicate predicate)
        boolean answer = stream.anyMatch(str -> Character.isUpperCase(str.charAt(1)));
  
        // Displaying the result
        System.out.println(answer);
    }
}

Output :

true

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