Opgaver om typestøbning

There are ordinary buildings, and there are school buildings. Make one inherit the other, and think about the type of object the getSchool and getBuilding methods should return. Change null to a Building or School object.

Create an application for a cat census. First, ask the user to enter cat names. Then the program should create Cat objects with the appropriate names and display the result of cat.toString().

We will create a menu framework for restaurants, more precisely—a function for selecting food. First, we implement the Selectable interface in the Food class, and the onSelect() method, which should display "The food was selected". Think about which methods can be called with the variable food and which with the variable selectable.

In this task, once again something is wrong. So you need to fix something. Specifically, set obj equal to an object that allows the main method to run error-free.

On Planet Terra, practically every dancer or player is a human. The same is true in this incomplete program you have in front of you. Take a look at what it does already, and then change the haveFun method so that it calls the play method for players and the dance method for dancers.