Thread: Exchanging between classes and methods

Hey! So, I'm in serious need of help. It should be simple, but I'm over thinking this and need help. It's a program due tonight. I need to create a Dog class that represents a dog. Then, there are 2 different methods that in the end will each represent one dog each. Each printout will show the Name, Breed, Age, and Age in Human Years. Right now I'm having trouble trying to move methods in between each class. Here's the first class.

import java.util.Scanner;
 
public class Dog { //no main method
		static Scanner input = new Scanner(System.in);
 
	//writeObject method
	public static void writeObject(String name, String breed, int age) {
		System.out.println("Enter the dog's name, breed, and age: ");
		name = input.toString();
		breed = input.toString();
		age = input.nextInt();
	}
	//getAgeInHumanYears method
	public static void getAgeInHumanYears(String name, String breed, int age) {
		System.out.println("Enter the dog's name, breed, and age: ");
		name = input.toString();
		breed = input.toString();
		age = input.nextInt();	
	}
}

And this is the second class code

public class Dog_Demo {
 
	public static void main(String[] args) {
		String name;
		String breed;
		int age;
		int humanAge;
	}
	//writeObject method
	public static String writeObject() {
		String name, breed;
		int age;
 
		System.out.println("Name: ", Dog.writeObject(name, breed, age));
		return null;
 
	}
	//getAgeInHumanYears method
	public static String getAgeInHumanYears() {
		System.out.println();
		return null;
	}
}

The assignment says to have both methods in both classes, but I'm confused on how to assign variables to each of the methods. There's no compiler messages yet because I'm getting stuck on how to compile the code, so it can go through because in Dog.Java, the first code in block #1, it has all the inputs and I want to run those methods in the Dog_Demo.java. I have one problem in this code:

public static String writeObject() {
		String name, breed;
		int age;
 
		System.out.println("Name: ", Dog.writeObject(name, breed, age));
		return null;
	}

It says: The method println(String) in the type PrintStream is not applicable for the arguments (String, void). So, I change it to:

System.out.printf("Name: ", Dog.writeObject(name, breed, age));
		return null;

But then it says: The method printf(String, Object...) in the type PrintStream is not applicable for the arguments (String, void)
Change return type of writeObject(...) to Object[]