create object class inside Main class in java

I want to create an object class (PERSON) inside the main class in java for some reasons (as far as I know such an action is possible without need to use a further file)

public class Main {
  public static void main(String[] args) {
    Person myObj = new Person();
    myObj.setName("John");
    System.out.println(myObj.getName());
  }
}

public class Person {
   private String name;

   public String getName() {
     return name;
   }

   public void setName(String newName) {
     this.name = newName;
   }
}

but I’m getting the following error

Main.java:9: error: class Person is public, should be declared in a file named Person.java
public class Person {
       ^
1 error

>Solution :

If you want to do this without creating another file, you can create Person as an inner class: https://docs.oracle.com/javase/tutorial/java/javaOO/innerclasses.html.