Design Patterns Quiz II

Classes with built-in interface adaptation is known as

• Two way adapter

• Pluggable adapter

• Interface adapter

• Parametrized adapter

Choose the wrong statement (s)

i)  Character code of an alphabet  is an example for intrinsic state

ii)  Style of an alphabet is an example for extrinsic state

iii)    Extrinsic state is stored in flyweight pool

iv)   Intrinsic state is specified by client

• iv only

• i and ii only

• iii and iv only

• iii only

Choose the wrong statement

• Flyweight pattern is related to composite pattern

• Adapter pattern is also known as wrapper

• Decorators provide a flexible alternative to delegation for extending functionality

• There is an aggregation relationship available between decorator and component

Match the Pattern and their other names

Pattern Other names

a.       Adapter i.  Surrogate

b.      proxy ii.  Wrapper

c.       Bridge iii. Handle

d.      Decorator iv. Wrapper

• (A) a-ii, b-i, c-iii, d-iv

• (B) a-iii, b-iv, c-i, d-ii

• (C) a-ii, b-iii, c-iv, d-i

• (D) a-iv, b-iii, c-ii, d-i

In composite pattern the client reaches at the

• (A) abstract

• (B) component

• (C) composite

• (D) leaf

Which of the following describes the Bridge pattern correctly?

• (A) This pattern builds a complex object using simple objects and using a step by step approach

• (B) This pattern refers to creating duplicate object while keeping performance in mind

• (C) This pattern is used when creation of object directly is costly

• (D) This pattern is used when we need to decouple an abstraction from its implementation so that the two can vary independently

Which of the following pattern can be considered, when extension by sub classing is impractical?

• a) composite

• b) flyweight

• c) proxy

• d) decorator

Match the Proxy and their description

• (A) a-iv, b-iii, c-ii, d-i

• (B) a-ii, b-iii, c-iv, d-i

• (C) a-ii, b-iv, c-i, d-iii

• (D) a-ii, b-i, c-iii, d-iv

Choose the wrong statement

• Chain of responsibility pattern is used when a set of objects that can handle a request should be specified dynamically

• Handler initiates request to a Concrete Handler in the chain

• Potential drawback of the chain of responsibility pattern is that the Client can't explicitly specify who handles a request

• Chain of Responsibility is often applied in conjunction with Composite

Choose the wrong statement

• Fly weight pattern uses sharing to support large number of finegrained objects efficiently

• Adapter simplifies an interface and façade converts one interface to another.

• Housekeeping proxy is also known as synchronization proxy.

• Shared object that can be used in multiple contexts concurrently is known as flyweight