Your program must support switching among

several different email libraries, but each one has

a slightly different interface.

$1234567$

Components shall be extensible at run$-$time.

The client should be able to add behaviors at run$-$time.

$1234567$

The system shall create objects without exposing the creation logic to the client

$1234567$

The system shall support "lazy creation" $-$ a component is created only if$,$ and when, the client demonstrates an interest in it$.$

$1234567$

A single instance shall be created and shall be$$ initialized only if$,$ and when, it is accessed.

$1234567$

The system shall provide a simple interface to a complex subsystem.

$1234567$

The system shall be configured with one of multiple families of products.

$1.$

Singleton

$2.$

Facade

$3.$

Abstract Factory

$4.$

Factory Method

$5.$

Adapter

$6.$

Proxy

$7.$

Decorator

ching among

several different email libraries, but each one has

a slightly different interface.

$1234567$

Components shall be extensible at run$-$time.

The client should be able to add behaviors at run$-$time.

$1234567$

The system shall create objects without exposing the creation logic to the client

$1234567$

The system shall support "lazy creation" $-$ a component is created only if$,$ and when, the client demonstrates an interest in it$.$

$1234567$

A single instance shall be created and shall be$$ initialized only if$,$ and when, it is accessed.

$1234567$

The system shall provide a simple interface to a complex subsystem.

$1234567$

The system shall be configured with one of multiple families of products.

$1.$

Singleton

$2.$

Facade

$3.$

Abstract Factory

$4.$

Factory Method

$5.$

Adapter

$6.$

Proxy

$7.$

Decorator