Ch 1

Question 0

Chain of responsibility

Answer 0

Avoid coupling a sender of a request to a receiver create a chain of receiving objects.

Question 1

Multitron

Answer 1

Class has named instances with global access. Use map for one instance per name.

Question 2

Scheduler

Answer 2

Explicitly control when threads execute single threaded code.

Question 3

Flyweight

Answer 3

Share a large number of fine grained objects using tables.

Question 4

Bridge

Answer 4

Decouple abstraction from implementation

Question 5

Active object

Answer 5

Decouple method execution from method invocation (asynchronous)

Question 6

Reactor

Answer 6

Asynchronous interface for resourceS that must be handled synchronously.

Question 7

Composite

Answer 7

Tree structure

Question 8

Adapter

Answer 8

Convert one interface into another

Question 9

Thread pool

Answer 9

Special case of object pool

Question 10

Abstract factory

Answer 10

Interface for creating family of related objects without concrete classes.

Create a specific factory, use interface to access it

Question 11

Builder

Answer 11

Separate construction of an object from its representation. Avoid telescoping constructors.

Question 12

Thread local storage

Answer 12

Static or global data specific to a thread

Question 13

Command

Answer 13

Encapsulate a request in an object. The command pattern forwards the request to a specific object for execution.

Question 14

Observer

Answer 14

State change in an object results in notification to all dependencies.

Question 15

Factory method

Answer 15

. Interface for creating an object, subclasses determine the instance type.