How do I strictly implement the given UML using Java?

I am trying to implement the UML below using Java:

I have successfully implemented every instruction except one which is:

Theater class:

• Override the showArea method and display the size multiply by 12.

I am new to UML and from my understanding, I am not allowed to create constructors in any of the classes. This is confusing since I don't know where I can define the size for showArea.

Below is the working code I have right now.

Place Class

public abstract class Place {      private String placeName;      private int capacity;      private String placeDescription;      private int workingHours;          public abstract void showEvents();  }  

Building Class

public abstract class Building extends Place{            public abstract void showArea();  }  

Theater Class

public class Theater extends Building{      @Override      public void showArea() {          System.out.println("Theater area : " );      }        @Override      public void showEvents() {          System.out.println("Events ready to be hosted !!");      }  }  

Main class

public class CodingtonDemo {      public static void main(String[] args) {          Theater theater = new Theater();          theater.showArea();          theater.showEvents();      }  }  

Expected result in console:

Theater area : 6000

Events ready to be hosted !!

My result so far:

Theater area : [No value yet]

Events ready to be hosted !!

https://stackoverflow.com/questions/65526838/how-do-i-strictly-implement-the-given-uml-using-java January 01, 2021 at 10:05AM