Crowdly

Hollywood Principle

Program to an interface not an implementation

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 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.

Where can you best custody your cryptos?

Using an exchange

On a hot wallet

On a cold wallet

Using a friend's wallet

How

does the concept of “halving” impact Bitcoin’s economic model?

reduces the mining reward, decreasing the supply rate and potentially

increasing scarcity

100%

allows central banks to control Bitcoin

’s supply

eliminates the need for miners in the blockchain network

increases transaction fees for Bitcoin users

Si en nuestra Base de Datos tenemos 10 clientes, podemos afirmar que:

Habrá como mínimo 10 oficinas y 10 fechas

(Dejar pregunta sin responder)

Ninguna de las otras respuestas es válida

No se puede afirmar nada sobre la cantidad de empleados y fechas

Habrá como mínimo 1 oficina y ninguna fecha

Habrá como mínimo 10 oficinas y ninguna fecha

Why

was the introduction of Central Bank Digital Currencies (CBDCs) significant in

the financial system?

completely replaced commercial banking services

allowed individuals to mine their own central bank currencies

combined the advantages of fiat money with the efficiency of blockchain

technology

eliminated the need for traditional fiat currencies

the context of blockchain governance, what is a major risk of a 51% attack?

The

network is forced to switch to a new consensus mechanism immediately

The

blockchain permanently shuts down if an attacker gains majority control

Miners

are required to perform additional proof-of-stake validation

single entity gains control over transaction validation and can rewrite the

ledger

Why

did the European Union consider launching an e-Euro based on blockchain?

compete with decentralized cryptocurrencies while maintaining regulatory

control

100%

enable anonymous and untraceable transactions

remove commercial banks from the financial system

eliminate traditional fiat currencies across all EU nations