Stream anyMatch() in Java with examples

The anyMatch() method of the Stream interface checks whether any element of the stream matches the given condition (predicate). It is a short-circuiting terminal operation, meaning it stops processing as soon as a matching element is found.

Example:

true

Explanation: stream().anyMatch(n -> n > 2) checks if any element in the list is greater than 2.

Syntax

boolean anyMatch(Predicate<? super T> predicate)

• Parameters: 'predicate' a condition to test elements of the stream.
• Return Value: Returns true if any element matches the predicate; otherwise, returns false, including when the stream is empty.

Example 1: This example checks whether any number in the list satisfies the given mathematical condition.

true

Explanation:

• anyMatch() checks if any element satisfies (n * (n + 1)) / 4 == 5.
• The lambda n -> (n * (n + 1)) / 4 == 5 defines the condition.
• Returns true if at least one element matches, otherwise false.

Example 2: This example checks whether any string has an uppercase character at index 1.

true

Explanation:

• anyMatch() checks if any string has an uppercase character at index 1.
• The lambda str -> Character.isUpperCase(str.charAt(1)) is used as the predicate.
• The result is true if at least one string satisfies the condition, otherwise false.

Note: It returns false for empty streams.