OnJava8-Examples/reflection/Staff.java

// reflection/Staff.java
// (c)2021 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.util.*;

public class Staff extends ArrayList<Position> {
  public void add(String title, Person person) {
    add(new Position(title, person));
  }
  public void add(String... titles) {
    for(String title : titles)
      add(new Position(title));
  }
  public Staff(String... titles) { add(titles); }
  public boolean positionAvailable(String title) {
    for(Position position : this)
      if(position.getTitle().equals(title) &&
         position.getPerson().empty)
        return true;
    return false;
  }
  public void fillPosition(String title, Person hire) {
    for(Position position : this)
      if(position.getTitle().equals(title) &&
         position.getPerson().empty) {
        position.setPerson(hire);
        return;
      }
    throw new RuntimeException(
      "Position " + title + " not available");
  }
  public static void main(String[] args) {
    Staff staff = new Staff("President", "CTO",
      "Marketing Manager", "Product Manager",
      "Project Lead", "Software Engineer",
      "Software Engineer", "Software Engineer",
      "Software Engineer", "Test Engineer",
      "Technical Writer");
    staff.fillPosition("President",
      new Person("Me", "Last", "The Top, Lonely At"));
    staff.fillPosition("Project Lead",
      new Person("Janet", "Planner", "The Burbs"));
    if(staff.positionAvailable("Software Engineer"))
      staff.fillPosition("Software Engineer",
        new Person(
          "Bob", "Coder", "Bright Light City"));
    System.out.println(staff);
  }
}
/* Output:
[Position: President, Employee: Me Last The Top, Lonely
At, Position: CTO, Employee: <Empty>, Position:
Marketing Manager, Employee: <Empty>, Position: Product
Manager, Employee: <Empty>, Position: Project Lead,
Employee: Janet Planner The Burbs, Position: Software
Engineer, Employee: Bob Coder Bright Light City,
Position: Software Engineer, Employee: <Empty>,
Position: Software Engineer, Employee: <Empty>,
Position: Software Engineer, Employee: <Empty>,
Position: Test Engineer, Employee: <Empty>, Position:
Technical Writer, Employee: <Empty>]
*/