01 Prelim CP2

Question 1

a programming methodology that
defines objects whose behaviors and
interactions accomplish a given task

Answer 1

Object-Oriented Programming

Question 2

> represents either a REAL-WORD OBJECT or
an ABSTRACTION

> has CHARACTERISTICS or ATTRIBUTES
- Attributes are what objects POSSESS or HAVE

> has STATES

> has BEHAVIOR (METHODS)

> Example: Car

Answer 2

Object

Question 3

> defines a KIND of object

> a BLUEPRINT for DEFINING the objects

Answer 3

Class

Question 4

> enables NEW objects to take on the
PROPERTIES of existing objects

> used to AVOID REPETITIION of programming instructions for each class

> makes use of the EXTENDS keyword

Answer 4

Inheritance

Question 5

Under Inheritance:

> (1)______ is used as the basis of
inheritance.
(2)_______ inherits from a superclass.

Usage:
public class Car extends Vehicle

Superclass: Vehicle
Subclass: Car

Answer 5

1. Superclass
2. Subclass

Question 6

What sample of code syntax is this:

/**An _______ for methods that return the
parameter and area of an object **/

public interface Measurable
{

 //Returns the perimeter
 public double getPerimeter();

 //Returns the area
 public double getArea();

}

Answer 6

Interface sample syntax

Question 7

> contains the HEADINGS for a NUMBER of PUBLIC METHODS

> can also define PUBLIC NAMED CONSTANTS

> uses the keyword IMPLEMENTS

SYNTAX:
public interface Interface_Name

USAGE:
public class Rectangle implements Measurable

Interface: Measurable

Answer 7

Interface

Question 8

Syntax for Interface:

Answer 8

public interface Interface_Name

Question 9

Sample usage of Interface:

Answer 9

public class Rectangle implements Measurable

Question 10

> a COLLECTION of related classes and
interfaces that have been GROUPED
together into a FOLDER

> used with the IMPORT keyword

Answer 10

Package

Question 11

Syntax for package:

Answer 11

package package _name;

Question 12

PACKAGE

Note: It typically consists of all (1)______
letters, often punctuated with the (2)_____
symbol.

Sample:
package java.util;

Answer 12

1. lowercase
2. Dot

Question 13

Package

Syntax for the import statement:

Answer 13

import package_name.class_name_or_asterisk;

Question 14

Package sample usage:

Answer 14

import java.util.Scanner;
import java.util.*;

Question 15

What keyword should you use for Inheritance?

Answer 15

extends

Question 16

What keyword should you use for Interface?

Answer 16

implements

Question 17

What keyword should you use for the package?

Answer 17

import

Question 18

The data type of an object is the name of its ________.

Example Object: Car
Example Object of the same kind: Motorcycle, Truck and
Bus

Answer 18

Class

Question 19

Objects of the same kind are said to have the same (1)_____ ____ and belong to the same (2)_____.

Answer 19

1. Data type
2. Class

Question 20

Example Object: Car
Example Object of the same kind: Motorcycle, Truck and Bus

What is the name of its class?

Answer 20

Vehicle

Question 21

You can use all the classes that are in a package within any program or class definition by placing an _______ statement.

Answer 21

Import

Question 22

For the package/import statement:

Is it a requirement to have the class in the same folder with the classes in the package?

Answer 22

NO. The class DOES NOT NEED to be in the same folder with the classes in the package.