传递类实例参数以便于实例化

public class Person {
    private String name;
    private int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public void displayInfo() {
        System.out.println("Name: " + name + ", Age: " + age);
    }
}

public class PersonService {
    public void printPersonInfo(Person person) {
        person.displayInfo();
    }
}

public class Main {
    public static void main(String[] args) {
        Person person = new Person("Alice", 30);
        PersonService service = new PersonService();
        service.printPersonInfo(person);
    }
}

public void printPersonInfo(Person person) {
    if (person != null) {
        person.displayInfo();
    } else {
        System.out.println("Person instance is null");
    }
}

public <T extends Person> void printPersonInfo(T person) {
    person.displayInfo();
}