Thread: Main.java expects Person.java behavior to work. How can I solve this?

Good afternoon, everybody. The Main class expects the Person class to have a specific behavior, so it will only work if I implement that behavior. What should I put in the Person.java file to make Main.java to run?

Main.java code:

package br.xxx.unitOne.exOne;
 
import br.xxx.unitOne.exOne.lib.Person;
 
public class Main{
    public static void main(String args[]){
        Person myName = new Person("My Name");
 
        System.out.println(myName.helloWorld());
 
    }
}

I would appreciate so much if someone could help me. Thanks.

What error messages are you getting with this code?
If there are no compiler errors, what happens when you execute the code?

Person cannot be resolved to a type

The compiler is looking for a class named Person. The Person class's class file must be on the class path so that the compiler can find it.
Do you have a Person class? Where is it located? Did you compile it so that there is a Person.class file somewhere?

The compiler needs to find the Person.class file when the Main.java file is compiled.

How are you compiling the java file? What command are you using?

Originally Posted by Norm

The compiler is looking for a class named Person. The Person class's class file must be on the class path so that the compiler can find it.
Do you have a Person class? Where is it located? Did you compile it so that there is a Person.class file somewhere?

The compiler needs to find the Person.class file when the Main.java file is compiled.

How are you compiling the java file? What command are you using?

I have created a Person.java file in the exact path (br.xxx.unitOne.exOne.lib.Person), the compiler finds it. But I don't know what to put inside Person.java to make Main.java work.

For exemple, when I write the code below inside Person.java

package br.xxx.unitOne.exOne.lib;
 
public class Person {
 
}

it returns

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
	The constructor Person(String) is undefined
	The method helloWorld() is undefined for the type Person
 
	at br.xxx.unitOne.hello_person/br.xxx.unitOne.exOne.Main.main(Main.java:7)

I think I should define the constructor Person(String) and the method helloWorld(). I don't have a clue how to do that. I have been reading about it but it seems impossible for me to do it.

Note: it is an exercise where I should be able to write the Person.java behavior just by looking to the Main.java code. It will make Main.java work after that. Can you give me some light? (The Main.java code is in the first message of the topic)

Thank you so much for your patience.

I should define the constructor Person(String) and the method helloWorld()

Yes that sounds right.
Look at the tutorial on how to create a constructor:
https://docs.oracle.com/javase/tutor...structors.html
and how to create methods:
https://docs.oracle.com/javase/tutor...O/methods.html

For more information on how to do different things see the items in the tutorial via the links on this page:
https://docs.oracle.com/javase/tutor...ybigindex.html
Save that last link for future reference.