Crowdly

Uses inheritance instead of composition.

Requires multiple if-then-else.

Makes each

state its own class.

Delegates behavior to state objects.

What is wrong with this implementation of the next() in the CompositeIterator class.

The else statement should return component.next() instead of null.

The pop() method should be used instead of peek().

The iterator must be returned instead of the component.

The iterator of component is not pushed.

Nothing is wrong.

Which of the following design principles are applied in the Iterator Pattern?

Program to an interface not an implementation

Hollywood Principle

Single Responsibility Principle

Liskov Substitution Principle

Which of the following statements are true about the Null Iterator?

The hasNext() method always returns False.

The hasNext() method always returns True.

Implements the Component interface.

Implements the Iterable interface.

Implements the Iterator interface.

Strategy uses delegation to vary the entire algorithm.

In what ways

are the Strategy and Template Method patterns different?

Strategy allows to vary an algorithm at runtime.

Template

Method uses inheritance to vary part of an algorithm.

Template Method allows to vary an algorithm at runtime.

Template Method varies an algorithm.

Which of these statements are true?

A macro command is formed by an array of single commands.

The MacroCommand class is abstract.

A MacroCommand class implements the 'Command' Interface.

A macro command can only execute commands on one receiver.

A macro is a bunch of commands packaged together and executed in sequence.

Which of these are example uses of the Command Pattern:

Macro recording.

Job queues and thread pools.

Progress bars.

Multilevel “undo/redo”.

Which of these statements about the Facade Pattern are true?

The Facade Pattern applies the Principle of Least Knowledge

The Facade Pattern decouple

clients and subsystem classes.

The Facade Pattern encapsulates a complex subsystem.

The Facade Pattern provides a simple interface to a complex subsystem.

The Facade Pattern increases the complexity of subsystem.

Which is considered a good and

desirable design?

High

cohesion and high coupling.

Low

cohesion and high coupling.

High cohesion and low coupling.

Low

cohesion and low coupling.