1.
Prototype:Specify
the kinds of objects to create using a prototypical instance, and create new
objects by copying this prototype.
2.
Proxy: Provide a
surrogate or placeholder for another object to control access to it.
3.
Singleton: Ensure
a class has only one instance, and provide a point of access to it.
4.
State: Allow an
object to alter its behavior when its internal state changes. the object will appear
to change its class.
5.
Strategy:Define a
family of algorithms, encapsulate each one, and make them interchangeable.
Strategy lets the algorithm vary independently from clients that use it.
6.
Template Method:Define
the Skelton of an operation, deferring some steps to subclasses. Template
method subclasses redefine certain steps of an algorithm without changing the
algorithms structure.
7.
Visitor:
Represent an operation to be performed on the elements of an object structure.
Visitor lets you define a new operation without changing the classes of the
elements on which it operates.
8.
What is a purpose of
Creational patterns?
concern the process of object creation
9.
What is a purpose of
Structural patterns?
the composition of classes or objects
10.
What is a purpose of
Behavioral patterns?
characterize the ways in which classes or
objects interact and distribute responsibility
11.
Define class inheritance ?
class inheritance defines
an object’s implementation in terms of another object’s implementation (code
and representation sharing
12.
Define interface
inheritance ?
interface inheritance (or
subtyping) describes when an object can be used in place of another
13.
Expand MVC:____________________________________________
MVC consists of three kinds of
objects.
M->>MODEL is the Application
object.
V->>View is the screen
presentation.
C->>Controller is the way
the user interface reacts to user input.
14.
Explain White-box reuse
Reuse by subclassing (class
inheritance)
Internals of parent classes are
often visible to subclasses
works statically, compile-time
approach
Inheritance breaks encapsulation
15.
Explain Black-box reuse
Reuse by object composition
Requires objects to have
well-defined interfaces
No internal details of objects
are visible
16.
What is delegation ?
Two objects are involved in
handling a request: a receiving object delegates operations to its delegate
17.
What is Framework?
A framework is a
set of cooperating classes that make up a reusable design for a specific class
of software
18.
Document Structure:
The choice of internal representation for the document affects nearly every aspect
of Lexis's design. All editing , formatting, displaying, and textual analysis
will require traversing the representation.
19.
Formatting:
How does Lexi actually arrange
text and graphics into lines and columns?
What objects are responsible for
carrying out different formatting policies?
20.
How do these policies interact with the
document’s internal representation?
Embellishing the user interface:
Lexis user interface include
scroll bar, borders and drop shadows that embellish the WYSIWYG document interface. Such
embellishments are likely to change as Lexis user interface evolves.
