Computer Programming 2 (PRELIMS)

Behaviors

Actions that an object can take

Import statement

By placing this, you can use all the classes that are in a package within any program o class definition

Abstract classes

Consider using this if you expect that classes that extend your abstract have many common methods or fields or require access modifiers other than public.

interfaces

Consider using this if you expect that unrelated classes would implement your interface

Abstract classes

Consider using this if you want to declare non-static or non-final fields.

Abstract classes

Consider using this if you want to share code among several closely related classes

interfaces

Consider using this if you want to specify the behavior of a particular data type, but not concerned about who implement its behavior

interfaces

Consider using this if you want to take advantage of multiple inheritance of type

False - Constructors can be overloaded too

Constructors cannot be overloaded (true or false)

equals() method

Instead of using == for comparison, use the ____ method

Constructor

It does not have a return type

Encapsulation

It groups instance variables and methods into a class

Encapsulation

It hides implementation details

Absolute value

Name: abs Description: ______

Ceiling

Name: ceil Description: ______

floor

Name: floor Description: ______

Maximum

Name: max Description: ______

Minimum

Name: min Description: ______

power

Name: pow Description: _____

Random Number

Name: random Description: ______

Rounding

Name: round Description: ______

Square root

Name: sqrt Description: ______

Reference

The address of the object's memory location

Class

The data type of an object is the name of its _____

Package

The name of the folder is the name of the ______

State

The values of an object's attributes give the object a ________

Variable is public

There are no restriction on where you can use its name

Local variables

Variables that ate not accessible from the rest of the class

True - it does not inherit any constructors from the base class

a derived class has its own constructors (true or false)

Static method

a method that can be invoked without using any object. It is invoked by using the class name instead

Inheritance

a program component that contains the heading for a number of public methods

mutator

a public method that changes the data stored in one (1) or more private instance variables

Accessor

a public method that returns data from a private instance variable

Constructors

a special method that is used to create and initialize an object

Polymorphism

ability of an object to take on many forms

false - abstract class CANNOT be instantiated but CAN be subclassed.

abstract class can be instantiated but cannot be subclassed (true or false)

Dynamic binding

allows many meanings to be associated to one method name

Polymorphism

allows you to make changes in the method definition for the derived classes

base class

also called superclass, parent class, and ancestor class.

derived class

also known as subclass, child class, and descendent class

Implements

an interface is used by another class through the _____ keyword

Static variables and Methods

belong to a class as a whole and not an individual object

Reference Types

class types are ____ whose variables hold references or memory addresses.

Package

collection of related classes and interfaces that have been grouped together into a folder

Method

collection of statements that are grouped together to perform an operation

Derived class

defined by adding instance variables and methods to an existing class.

Class

defines a kind of object; it is a blueprint for defining objects

UML Class Diagram

describes the structure of a class by displaying the class name (first row), variables (second row), and methods (third row).

true

different classes can implement the same interface (true or false)

Method

each behavior is defined by a piece of Java code

Inheritance

enables the use of existing class to define a new class

Base class

existing class that the derived class is built upon.

Information Hiding

is a mechanism for restricting access to some of the object's components

Argument

is the actual value that is passes when the method is invoked

Static variable

it can be public or private

Constructor

it can call methods within its class

Object

it has characteristics or attributes.

Interface

it should include comments that describe the methods

Variable is private

its name cannot be used to access it outside of the class definition

Parameter

list of variables in a method declaration

Abstract method

method that is declared as abstract and does not have an implementation

Method's signature

method's name and the number and types of its parameters

overloading

occurs when multiple methods have the same name within the same class

Encapsulation

process of combining data and actions into a single item.

Object- Oriented Programming

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

Predefined Math class

provides a number of standard mathematical methods

Static variable

shared by all the objects of its class

Method definition is private

the method cannot be invoked within the definitions of methods in its class

Abstract method

this is written without braces, followed by a semicolon.

"new"

this keyword calls a constructor

Void

this keyword denotes that the method is not used to return a value

"this"

this keyword represents the object's name receiving the method call within a method definition.

Interface

used to specify methods that a class must implement. it contains headings for a number of public methods

Instance variables

variables declared outside the method, constructor, or any block.

Local Variables

variables declared within a method definition and are only visible to the methods n which they are declared.

Method is public

you can invoke it anywhere without restriction