Given the following class definition fragments and class instantiations, complet

Question

Given the following class definition fragments and class instantiations, complete the table below.
Assume that the methods shown here do not appear in any other classes. (E.g., the Restaurant class does not define a toString method.)

class Building { public Point getLocation() ... }
class Restaurant extends Building { public int getSeatCount() ... }
class Lab extends Building { public String toString() ... }
class Diner extends Restaurant { public boolean equals(Object other) ... }

Lab l = new Lab();
Restaurant r = new Diner();
Building b = l;
Object o = r;

In each blank cell, indicate what would happen if the method in each column is invoked with the object obj in each row. Choose (only one) from the following.

• compiler error
• runtime error (i.e., an exception is thrown)
• X, where X is the class from which the method is called

The first row has been done for you, as a example.

Explanation / Answer

obj obj.getLocation() obj.getSeatCount() obj.toString() obj.equals(obj)

b Building Compiler error Lab Object

l Building compiler error Object Object

o compiler error compiler error    Object    Object

r   Building   Restaurant   Object Object

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