Stream.anyMatch API is

boolean anyMatch(Predicate<? super T> predicate)

I create a Class as follow:

class ClassA  {    
    public boolean anyMethodName(Object o) {
        return o instanceof Integer;
    }
}

Then I can run following:

List<String> durunitList = Arrays.asList("h", "d", "w", "m", "y");
ClassA classA = new ClassA();
System.out.println(durunitList.stream().peek(System.out::println).anyMatch(classA::anyMethodName));

But in my ClassA, I haven’t implement interface Predicate and override its functional method

boolean test(T t)

Why classA::anyMethodName can still be passed to Stream.anyMatch(…)?