Passing arguments to method

What is the output in this example?

public class PassArgumentsDemo {
    public static void main(String[] args) {
        ProgrammingLanguage java = new ProgrammingLanguage(1995);

        referenceDemo(java);

        System.out.println(java.getReleaseYear());
    }

    public static void referenceDemo(ProgrammingLanguage language) {
        language = null;
    }
}