Exam 10: Introduction to Inheritance

A class diagram consists of a rectangle divided into three sections.

What does polymorphism mean in Java programming?

If a ____ method has the same name as a parent class method and you use the name with a child class object, the child method hides the original.

It is useful to override the parent class members when the superclass data fields and methods are not completely appropriate for the subclass objects.

Write the statement to create a class header with a superclass-subclass relationship, with Vehicle as the superclass and Subaru as the subclass.

class InstanceofDemo {     public static void main(String[] args)    {         Parent object1 = new Parent();         Parent object2 = new Child();         System.out.println("object1 instanceof Parent: "             + (obj1 instanceof Parent));         System.out.println("object1 instanceof Child: "             + (obj1 instanceof Child));         System.out.println("object1 instanceof MyInterface: "             + (obj1 instanceof MyInterface));         System.out.println("object2 instanceof Parent: "             + (obj2 instanceof Parent));         System.out.println("object2 instanceof Child: "             + (obj2 instanceof Child));         System.out.println("object2 instanceof MyInterface: "             + (obj2 instanceof MyInterface));      } } The above code defines a parent class (named Parent ), a simple interface (named MyInterface ), and a child class (named Child ) that inherits from the parent and implements the interface. Following program execution, what will be the output of the six println statements?

Which of the following statements depicts the valid format to call a superclass constructor from a subclass constructor?

The ability to use inheritance in Java makes programs easier to write, ____, and more quickly understood.

The UML diagram above derives a subclass called EmployeeWithTerritory from the superclass Employee . Describe what variables and methods the class EmployeeWithTerritory  inherits from the superclass Employee .  Also, describe any variables and public methods defined by the subclass EmployeeWithTerritory .

Arrows used in a ____ to show inheritance relationships extend from the descendant class and point to the original class.

What is the difference between derived classes and base classes when considering two classes that inherit from each other?

The class used as a basis for inheritance is the ____ class.

Create a class named Employee with a name and a salary . Make a class named Manager that inherits from Employee with an instance field named department . Supply a toString() method that prints the manager's name, department, and salary. Make another class named Director that inherits from Manager with an instance field named stipendAmount . Supply the toString() method for Director that prints all of its instance variables. Also, write a program named myOutput that instantiates an object of each of the classes and invokes the toString() method of each of the objects.

Usually, the subclass constructor only needs to initialize the ____ that are specific to the subclass.

When you instantiate an object that is a member of a subclass, how many constructors are called?

A nonstatic method cannot  override a static member  of a parent class.

____ is a mechanism that enables one class to acquire all the behaviors and attributes of another class.

Which statement correctly declares a sedan object of the Car class?

How is the keyword protected used?

In a UML diagram, an inheritance relationship is indicated with an arrow that points from the original class  to the descendant class  .