Optional "map" maps String to Boolean object instead of primitive boolean when using &quot-CodePudding

I have following problem, I'm not sure if it is IntelliJ Bug or something else.

I have static function which maps string to boolean. When I use this function in Optional.map() it maps every time to Boolean instead of boolean. Is this standard behavior of type inference?

public class MyClass {

    public void myMethod() {
        Optional<String> myAttribute = Optional.of("1");
    
        final var myBoolean = myAttribute
          .map(MyClass::mapStringToBoolean) //it maps to Optional<Boolean>, why not to boolean when function gives primitive back?
          .orElse(false);

        // "myBoolean" is Boolean instead of boolean
    }

    public static boolean mapStringToBoolean(String myString) {
        return "1".equals(myString) || "true".equals(myString);
    }
}

CodePudding user response：

Optional<T>#orElse returns T, which cannot be a primitive. Try replacing var with boolean to force unboxing.

CodePudding user response：

Primitives cannot be used as generics in Java so you are getting autoboxed. Try to declare eg List<int> to see what will happen.