Java 8 Streams: allMatch(), anyMatch(), noneMatch()

the anyMatch(), allMatch(), and noneMatch() methods are used to check if any, all, or none of the elements in a stream match a certain condition.

AnyMatch Example Code

anyMatch(Predicate<T> predicate) returns true if any element in the stream matches the given predicate.

List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
boolean evenNumber= numbers.stream().anyMatch(n -> n % 2 == 0);

AllMatch Example Code

allMatch(Predicate<T> predicate) returns true if all elements in the stream match the given predicate.

List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
boolean allEven = numbers.stream().allMatch(n -> n % 2 == 0);

noneMatch Example Code

noneMatch(Predicate<T> predicate) returns true if no element in the stream matches the given predicate.

List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
boolean noEven = numbers.stream().noneMatch(n -> n % 2 == 0);

It’s important to note that these methods are short-circuiting, meaning that as soon as a match is found (or not found, in the case of noneMatch()), the stream processing is stopped and the result is returned.

Java Code

public class AllMatch {

	public static void main(String[] args) {

		List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
		boolean evenNumber= numbers.stream().anyMatch(n -> n % 2 == 0);
		
		boolean allEven = numbers.stream().allMatch(n -> n % 2 == 0);
		
		boolean noEven = numbers.stream().noneMatch(n -> n % 2 == 0);
		
		System.out.println("evenNumber:"+evenNumber);
		
		System.out.println("allEven:"+allEven);
		
		System.out.println("noEven:"+noEven);

	}

}
Output:
evenNumber:true
allEven:false
noEven:false

Thanks for Reading…