Crowdly

Which of the following statements are true about the state pattern?

Makes each

state its own class.

Delegates behavior to state objects.

Uses inheritance instead of composition.

Requires multiple if-then-else.

Defines a common State interface.

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

The iterator of component is not pushed.

The iterator must be returned instead of the component.

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

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

Nothing is wrong.

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

Which of these statements are true?

The MacroCommand class is abstract.

A macro command can only execute commands on one receiver.

A MacroCommand class implements the 'Command' Interface.

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

In what ways

are the Strategy and Template Method patterns different?

Template Method allows to vary an algorithm at runtime.

Template Method varies an algorithm.

Strategy allows to vary an algorithm at runtime.

Strategy uses delegation to vary the entire algorithm.

Template

Method uses inheritance to vary part of an algorithm.

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

Single Responsibility Principle

Liskov Substitution Principle

Hollywood Principle

Program to an interface not an implementation

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

Implements the Iterable interface.

Implements the Component interface.

The hasNext() method always returns True.

The hasNext() method always returns False.

Implements the Iterator interface.

Job queues and thread pools.

Which of these are example uses of the Command Pattern:

Progress bars.

Macro recording.

Multilevel “undo/redo”.

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

Which of these statements about the Facade Pattern are true?

The Facade Pattern applies the Principle of Least Knowledge

The Facade Pattern encapsulates a complex subsystem.

The Facade Pattern decouple

clients and subsystem classes.

The Facade Pattern increases the complexity of subsystem.

Which is considered a good and

desirable design?

High cohesion and low coupling.

High

cohesion and high coupling.

Low

cohesion and high coupling.

Low

cohesion and low coupling.