How do I program this in java I have got as far as drawing the pseudo code

import java.awt.List;
import java.util.ArrayList;
 
public interface Person{ // make it a public. Is an interface demanded?
  public String getName();
}
 

public class Course{ // also public 
  private ArrayList students = new ArrayList(); // this is private!

  public addStudent(student: Student){

  }

  public void getNumberOfStudents(){ // public method

  }
}