java code: Problem 1: Create a class called Elevator that can be moved between floors in...

java code:

Problem 1:

Create a class called Elevator that can be moved between floors in an N-storey building. Elevator uses a constructor to initialize the number of floors (N) in the building when the object is instantiated.

Elevator also has a default constructor that creates a five storey building.

The Elevator class has a termination condition that requires the elevator to be moved to the main (i.e., first) floor when the object is cleaned up. Write a finalize() method that satisfies this termination condition and verifies the condition by printing a message to the output, Elevator ending: elevator returned to the first floor.

In main(), test at least five (5) possible scenarios that can occur when Elevator is used in a building with many floors (e.g., create, move from one floor to another, etc.).

Tip: Termination occurs when the instance is set to null. You may wish to investigate “garbage collection” for this exercise.

Solutions

Expert Solution

public class Elevator extends Thread{

   int floor;

   public Elevator() {
       // TODO Auto-generated constructor stub
       floor = 5;
   }


   public Elevator(int floor) {
       super();
       this.floor = floor;
   }

   public void move() {
       try {
           for(int i=1;i<=floor;i++) {
               System.out.println("Elevator is at floor "+i);
               sleep(1000);
           }
       }catch (Exception e) {
           // TODO: handle exception
       }
   }

   public void move(int a,int b) {
       System.out.println("Elevator is at floor "+a+" and moving to floor "+b);
   }

   @Override
   protected void finalize() throws Throwable {
       // TODO Auto-generated method stub

       System.out.println("Elevator ending: elevator returned to the first floor.");
   }

   public static void main(String[] args) throws Throwable {
       // TODO Auto-generated method stub
       Elevator e = new Elevator();
       e.move();
       e.move(5, 3);
       e.finalize();

       Elevator e1 = new Elevator(10);
       e1.move();
       e1.move(10, 4);
       e1.finalize();
   }

}

Elevator is at floor 1 Elevator is at floor 2 Elevator is at floor 3 Elevator is at floor 4 Elevator is at floor 5 Elevator is at floor 5 and moving to floor 3 Elevator ending: elevator returned to the first floor. Elevator is at floor 1 Elevator is at floor 2 Elevator is at floor 3 Elevator is at floor 4 Elevator is at floor 5 Elevator is at floor 6 Elevator is at floor 7 Elevator is at floor 8 Elevator is at floor 9 Elevator is at floor 10 Elevator is at floor 10 and moving to floor 4 Elevator ending: elevator returned to the first floor.

venereology answered 1 year ago

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