Computer Architecture and Software Design Patterns Quiz

Show-Page is the Pega method that displays a step page's complete structure in XML format, making it invaluable for debugging. It shows all properties and their values in the current clipboard context. Despite the name, it outputs XML, not HTML, and is specifically designed for page inspection.

Design patterns provide established solutions to recurring design problems. Option A is correct - patterns give developers a shared vocabulary for discussions. Options B and C describe actual benefits (solutions to real problems, communicating insight), so they ARE benefits. Option D states patterns solve novel problems, which is incorrect - patterns solve known, recurring problems, not new ones. The question asks what is NOT a benefit.

The Singleton pattern specifically restricts a class to a single instance. Option D is correct - Singleton ensures only one instance exists and provides global access. Options A, B, and C are incorrect because Command, Limiter (not a standard GoF pattern), and Strategy don't limit instance count - they're behavioral patterns focused on execution, encapsulation, and algorithm variation respectively.

Iterators provide a way to access elements of a collection sequentially without exposing its underlying representation. They are specifically designed for collection classes where you need to traverse elements uniformly regardless of the collection's internal structure.

Factory Method is known as Virtual Constructor because it defers object instantiation to subclasses, allowing the client code to work with product interfaces without knowing the concrete classes being instantiated. Abstract Factory creates families of related objects, not individual instances via virtual construction.

Adapter pattern is called Wrapper because it wraps an existing class with a new interface, allowing incompatible interfaces to work together. A Proxy controls access, Surrogate is another name for Proxy, and Token is unrelated to structural adaptation.

Bridge pattern is also known as Handle/Body because it separates abstraction (handle) from implementation (body), allowing them to vary independently. This decoupling prevents the permanent binding between abstraction and implementation that occurs with monolithic designs.

Decorator is known as Wrapper because it wraps an object to add new behavior dynamically without altering its structure, stacking multiple decorators for combined effects. Adapter also wraps but for interface compatibility, not behavior extension.

Command pattern is called Action (for the object representing the action) and Transaction (for database operations where commands represent transactions). Wrapper and Surrogate are names for other patterns (Decorator and Proxy respectively).

Command pattern encapsulates a request by binding a set of actions to a receiver, allowing parameterization and queuing of requests. It separates the requester from the executor but the key is encapsulation of the request itself.

Gang of Four format includes Intent (what the pattern does) and Consequences (trade-offs and results). Problem and Solution are not standard GoF sections - the pattern describes the solution, and the problem is implicit in the context.

java.util contains Iterator, ListIterator, and collections that use the Iterator pattern for uniform traversal. Java.enumeration is legacy, java.math is for big numbers, and java.text handles formatting and parsing.

ROM (Read-Only Memory) is permanent memory built into computers because it retains data without power and cannot be easily modified. RAM is volatile temporary memory that loses data when power is off, CPU is the processor, and CD-ROM is removable media. The 'permanent' and 'built into your computer' descriptions point directly to ROM chips containing firmware.

CPU (Central Processing Unit) is called the 'brain' of the computer because it processes all instructions and coordinates operations. ROM is permanent memory, RAM is temporary workspace, and Monitor is an output display. The CPU's role in executing programs, performing calculations, and managing data flow makes it the control center analogous to a brain.

Hard drive storage capacity is measured in Gigabytes (GB), which quantifies how much data the drive can store. MHz measures processor speed, 52X is CD-ROM drive rotation speed, and Mbps is data transfer rate. Gigabytes directly address storage capacity, making it the correct unit for hard drive size specifications.

Standard CDs store approximately 650MB of data, though newer capacities reach 700MB. 1.4MB is floppy disk capacity, 10MB is unrealistically low for optical media, and 150MB doesn't match standard CD specifications. The 650MB figure is the widely accepted standard capacity for traditional compact discs.

Keyboards are input devices that send data TO the computer, while speakers, monitors, and printers all output information FROM the computer. This question tests understanding of the fundamental difference between input and output peripherals. The keyboard is the only device listed that doesn't display or produce information for the user.

A modem (modulator-demodulator) enables computers to communicate over telephone lines and access the internet. RAM is temporary memory, CD-DRIVE is optical storage, and HARD-DRIVE is permanent storage - none of these facilitate network communication. The modem's specific purpose is converting digital signals to analog for telephone line transmission.

A monitor displays output from the computer to the user, making it an output device. Input devices like joysticks, microphones, and keyboards send data TO the computer.