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import java.util.function.*;
 
class Ideone {
	public static void main (String[] args) {
		"foo".chars()
        .mapToObj(c -> (char) c)
        .filter(Predicate.not(Character::isAlphabetic))
        .toList();
	}
}

Main.java:7: error: incompatible types: inference variable T has incompatible bounds
        .filter(Predicate.not(Character::isAlphabetic))
        ^
    lower bounds: Integer,Object
    lower bounds: Character
  where T is a type-variable:
    T extends Object declared in method <T>not(Predicate<? super T>)
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
1 error

Standard output is empty