OOP practice

Restaurant.java

public class Restaurant {
  public static void main(String args[]) throws InterruptedException {
    Kitchen kitchen = new Kitchen();
    while (true) {
      Order meal = kitchen.checkForFinished();
      System.out.println("Finished: " + meal);

      // Maybe send a new order to the kitchen.
      double rand = Math.random();
      if (rand < .1) {
        kitchen.placeOrder(new Pasta());
      } else if (rand < .2) {
        kitchen.placeOrder(new Burger());
      } else if (rand < .3) {
        kitchen.placeOrder(new Pizza());
      } else if (rand < .4) {
        kitchen.placeOrder(new Sushi());
      }

      kitchen.timePasses();
    }
  }
}

/**
 * ----------------------------------------------
 * Only modify code between the line above and the matching line below.
 *
 * Step 1: Fill in the TODOs below.  What happens when there are more orders than Frank can handle?
 * Step 2: Create a SushiChef that is a subclasses of chef and can make sushi 2x faster than a Chef.
 * Step 3: Make "chef" an array of chefs instead of a single one.
 */
class Kitchen {
  Chef chef;
  int time;

  public Kitchen() {
    chef = new Chef("Frank");
    time = 0;
  }

  /**
   * Returns a finished Order, or null.
   */
  public Order checkForFinished() {
    // TODO
    System.out.println("Checking with " + chef + " if any orders are up.");

    return null;
  }

  /**
   * Sets the chef's current order, if they're not already busy.
   */
  public void placeOrder(Order order) {
    // TODO
    System.out.println("Placing a new order [" + order + "] with " + chef);
  }

  /**
   * Modifies timeLeft for any order(s) in progress.
   */
  public void timePasses() throws InterruptedException {
    // TODO
    System.out.println("Current time: " + time++);

    Thread.sleep(2000);
  }
}

/**
 * Do not modify anything below this line!
 * ----------------------------------------
 */

class Chef {
  String name;
  Order currentOrder;

  public Chef(String name) {
    this.name = name;
  }

  public String toString() {
    return name;
  }
}

class Order {
  String description;
  int timeLeft;

  public boolean isDone() {
    return timeLeft == 0;
  }

  public String toString() {
    return description + " (" + timeLeft + ")";
  }
}

class Pasta extends Order {
  public Pasta() {
    description = "Pasta";
    timeLeft = 2;
  }
}

class Burger extends Order {
  public Burger() {
    description = "Burger";
    timeLeft = 1;
  }
}

class Pizza extends Order {
  public Pizza() {
    description = "Pizza";
    timeLeft = 3;
  }
}

class Sushi extends Order {
  public Sushi() {
    description = "Sushi";
    timeLeft = 6;
  }
}