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Java is a high-level, general-purpose, and object-oriented programming language that was originally developed by Sun Microsystems in 1995. It has since become one of the most popular programming languages due to its platform independence, versatility, and widespread use in various domains.
Here are some key characteristics and features of Java:
Platform Independence:
Java follows the "Write Once, Run Anywhere" (WORA) principle. Code written in Java can run on any device or platform with a Java Virtual Machine (JVM), making it platform-independent.
Object-Oriented Programming (OOP):
Java is designed around the principles of object-oriented programming, including concepts like classes, objects, encapsulation, inheritance, and polymorphism.
Syntax:
Java syntax is similar to C and C++, making it familiar to many programmers. It also incorporates some features from other languages, which contribute to its readability and ease of use.
Automatic Memory Management:
Java uses automatic garbage collection to manage memory. This helps developers avoid memory leaks and makes memory management more straightforward.
Rich Standard Library:
Java comes with a vast standard library that provides a wide range of pre-built functionality, from data structures to networking, I/O, and graphical user interface development.
Multi-Threading:
Java supports multithreading, allowing developers to write programs that can perform multiple tasks simultaneously. This is useful for building scalable and responsive applications.
Security:
Java places a strong emphasis on security. It runs in a sandboxed environment, which helps protect against various security threats. Java applets, once a common feature for web-based applications, have been deprecated due to security concerns.
Community and Ecosystem:
Java has a large and active community of developers worldwide. The ecosystem includes a variety of tools, frameworks (e.g., Spring, Hibernate), and libraries that enhance Java's capabilities for different application domains.
Enterprise Adoption:
Java is widely used in enterprise environments for building large-scale, mission-critical applications. Its reliability, scalability, and maintainability have contributed to its popularity in business and industry.
Continued Evolution:
Java is regularly updated with new features and improvements. The introduction of the Java Platform, Standard Edition (Java SE) and Java Platform, Enterprise Edition (Java EE) has evolved into the more modular and streamlined Java Platform, Standard Edition (Java SE) and Jakarta EE.
Spring boot
public class printSong
{
public static void main (String[] args)
{
for (int i = 1; i <= 3; i++)
{
System.out.println("Row, row, row your boat, gently down the stream,");
System.out.println ("Merrily, merrily, merrily, merrily; life is but a dream");
System.out.println();
}
}
}
do while
public class testing_do_while_loop {
public static void main(String[] args){
int x=0;
do{
System.out.println("Value of x is " + x + ".");
x++;
}while (x<=6);
}
}
for loop
public class testing_for_loop {
public static void main(String[] args) {
for( int i = 1; i < 5; i++ ) {
// i++ means increase the value of i by 1 each time untill 1<5
System.out.println("Value of i is " + i + " now.");
}
}
}
if else
public class testing_if_else {
//This part is for string conditions
public static void main(String[] args){
String str="dengue";
if("covid".equals(str)){
System.out.println("You cannot go out");
}
else{
System.out.println("You can go out");
}
//This part is for int conditions
int i = 0;
if (i == 10){
System.out.println("i is 10");
}
else{
System.out.println("i is not 10");
}
}
}
if else if
public class testing_if_else_if {
public static void main(String[] args){
String str = "Covid";
if ("Covid".equals(str)){
System.out.println("You Have Covid");
}
else if ("Dengue".equals(str)){
System.out.println("You Have Dengue");
}
else{
System.out.println("You Are Healthy");
}
}
}
oop concepts
Encapsulation:
Encapsulation is the bundling of data (attributes) and methods that operate on the data into a single unit known as a class. It helps in hiding the internal implementation details of the class
public class BankAccount {
private double balance;
public void deposit(double amount) {
balance += amount;
}
public double getBalance() {
return balance;
}
}
Inheritance:
Inheritance allows a class to inherit properties and behaviors from another class. The class that is being inherited from is called the superclass or parent class, and the class that inherits is called the subclass or child class.
java
public class Animal {
void eat() {
System.out.println("This animal eats.");
}
}
public class Dog extends Animal {
void bark() {
System.out.println("The dog barks.");
}
}
Polymorphism:
Polymorphism allows objects to be treated as instances of their parent class rather than their actual class. This can be achieved through method overriding and interfaces.
java
public interface Shape {
void draw();
}
public class Circle implements Shape {
@Override
public void draw() {
System.out.println("Drawing a circle.");
}
}
public class Square implements Shape {
@Override
public void draw() {
System.out.println("Drawing a square.");
}
}
Abstraction:
Abstraction involves simplifying complex systems by modeling classes based on the essential properties and behaviors they share. Abstract classes and interfaces in Java are used to achieve abstraction.
Q: XRPL is decentralized, permissionless, and open-source
Answer: True
Q: What is the native digital asset on the XRP Ledger?
Answer: XRP
Q: On average, how long does a transaction confirmation on the XRP Ledger take?
Answer: 3 to 5 seconds
Q: What is the XRP Ledger’s validation mechanism?
Answer: Federated Consensus
Q: What can the XRP Ledger be used for today?
Answer: All the correct
Q: What is the average cost of transactions on XRPL?
Answer: Less than 1 cent
Q: Which of the following describes the XRPL?
Answer: All are correct
Q) The XRPL’s built-in DEX is based on an order book model.
Answer: True
Q: The XRP Ledger is useful for developers because.
Answer: They are able to code in Python, Java and JavaScript languages.
LSK️
Q: Which popular programming language does Lisk support?
Answer: JavaScript
Q: What consensus mechanism does Lisk currently utilize?
Answer: Delegated Proof of Stake
Q: Which token is used within the Lisk Network as a utility token?
Answer: LSK
Q: What is the current development goal for Lisk?
Answer: To enable interoperability within the Lisk ecosystem
Q: How will blockchain applications operate within the Lisk Ecosystem?
Answer: On separate sidechains
Q: What makes Lisk accessible to Web3 developers?
Answer: All are correct
Q: How can users benefit from Lisk’s accessibility?
Answer: All are correct
Q: What can LSK holders do with the token?
Answer: All are correct
[23/08, 15:58] +94 70 261 4779: BTTC️
Q: “Locked staking” refers to the process of locking your digital assets on a _ for a certain period of time.
A: Proof of Stake blockchain
Q: With Binance Locked Staking, redemption doesn’t require a certain unlocking period. True or false?
A: false
Q: What can you NOT do on Binance Earn?
A: Conduct leveraged trading to amply the returns
Q: Which of the following is a form of passive income?
A: Alice stakes her crypto holdings
Q: What can you do with Binance Earn?
A: Select different products to grow your crypto holdings
Q: What is NOT staking?
A: Generate returns by trading your coins
Q: Once you subscribe to the Locked Staking, interests will be calculated from the following day, and are distributed to your Spot Wallet every day. True or false?
A: true
Q: When the Locked Staking process is complete, the staked assets will be redeemed automatically and returned to your _.
A: spot wallet
Q: Binance Locked Staking’s locking period for different products is the same. True or false?
We want to click Add Network in the top-right corner to manually add the Binance Smart Chain one – it doesn’t come packaged with MetaMask. It’s important to note that there are two networks we can use here: the testnet or the mainnet. Below are the parameters to fill in for each.
Mainnet (This is the one you are probably looking for)
Network Name: Smart Chain
New RPC URL: https://bsc-dataseed.binance.org/
ChainID: 56
Symbol: BNB
Block Explorer URL: https://bscscan.com
Testnet
Network Name: Smart Chain - Testnet
New RPC URL: https://data-seed-prebsc-1-s1.binance.org:8545/
Rewards are limited and are available on a first-come, first-served basis. Users can only claim the reward for each course once after completing the quiz.
Rewards will be distributed within 48 hours to qualified learners who pass quiz. Users may check their rewards via Account > R Center.
Binance reserves the right to disqualify trades that are deemed to be wash trading or illegally bulk registered accounts, self-dealing or display attributes of market manipulation.
Binance reserves the right to terminate the activity at any time without prior notice.
Binance accounts can only be used by the account registrants. Binance reserves the right to suspend, freeze or cancel the use of Binance accounts by persons other than account registrants.
Binance reserves the right of final interpretation of the activity. Binance reserves the right to change or modify these terms at its discretion at any time.
Where any discrepancy arises between the translated versions and the original English version, the English version shall prevail.
Risk warning: Cryptocurrency trading is subject to high market risk. Please make your trades cautiously. You are advised that Binance is not responsible for your trading losses
ExpertOption is a popular online broker offering digital options and financial trading. This 2022 guide covers the deposit and withdrawal process, investing platform, account types, plus demo trading solution. In addition, we explore the Expert Option app in our mobile trading review
Leverage rates with Expert Option vary depending on the instrument and market.
For most forex pairs, such as the EUR/USD, leverage is set at 1:30. This level is imposed following rules and regulations set out of by the European Securities and Markets Authority (ESMA). Minor forex pairs like EUR/NOK, NZD/USD, AUD/CAD, USD/SGD, and EUR/PLN, offer leverage up to 1:20.
Mobile Apps
Expert Option has dedicated mobile apps for Android and iOS devices. These can be downloaded from the Google Play Store or Apple App Store. Alternatively, users can download the APK install file direct from the official website. Each mobile app is highly rated in their respective stores.
Deposits
Keeping the minimum deposit at $10 allows investors from all walks of life to join the platform and start their trading careers. Deals can be made for a minimum of $1 and you can deposit in any local currency. The maximum deposit amount is $5000 while the broker recommends that bigger sums are split into several transactions
Visa
Skrill
QIWI
RuPay
PayTM
Yandex
Neteller
Fasapay
Maestro
UnionPay
WebMoney
MasterCard
Wire Transfer
Withdrawals
ExpertOption has streamlined the payment process so that requests are fully processed within two business days (Monday – Friday). Depending on the method and account type, withdrawals can also be processed almost instantly, usually via cryptocurrency or e-wallets.
The minimum withdrawal amount is only $10; in most instances, account verification is required before any withdrawal is approved. The first withdrawal can only be processed through the same payment method as the deposit
The most popular choice. All the Basic features plus:
Free consultations $500 minimum deposit Personal account manager Daily market reviews and financial research
Gold
All the Silver features plus:
Priority withdrawals $2,500 minimum deposit Increased asset profit of up to 2%
Platinum
All the Gold features plus:
1 to 1 training Account management $5,000 minimum deposit Increased asset profit of up to 4% Trading signals from an analytical agency Unlimited number of simultaneously open deals
or Go to : https://academy.binance.com/en/learn-and-earn
- Login
- Start Course
🟢 BUSD
Q : I have noticed that....
A : False
Q : The main benefit of keeping ....
A : False
Q : Why KYC ?
A :
- Its part ...
- KYC improves ...
- KYC Check ...
- KYC proactively ...
Q : What is Cryptocurrency?
A : A Cryptocurrency is a form of digital cash that enable ....
🟢 SHIBA
Q : Using BNB to Pay...
A : True
Q : What are the essential...
A : Fill All
Q : Binance flexible savings not...
A : False
Q : A market order is a type...
A : False
Q : I don't need to complete...
A : False
Q : What is the trading fee...
A : 0
🟢 XTZ
Q : What is Tezos’ native coin?
A : tez (xtz)
Q : How does Tezos increase security in the network?
A : By being deeply decentralized
Q : What are some of the types of decentralized applications built on the Tezos blockchain?
A : All of the above
Q : What are some use cases of Tezos’ native coin?
A : 1. Voting rights
2. Becoming a validator
Q : Who can participate in securing the network?
A : 1. Users who delegate their Tez (XTZ) tokens to bakers
2. Validators called bakers
Q : What is the consensus mechanism model used by Tezos called?
A : Liquid Proof of Stake
Q : Which of the following are true? What Is Tezos (XTZ)?
A : 1. Tezos’ unique self-amending protocol prevents hard forks
2. Tezos’ code is open-source code
🟢 IMX
Q : Which blockchain is the Immutable X ecosystem built for?
A : Ethereum
Q : Users can trade NFTs on any of the marketplaces built on Immutable X.
A : TRUE
Q : What can token holders do with the IMX token?
A : Pay for fees on Immutable X, Vote for governance proposals, Stake to earn IMX rewards
Q : Who can build on IMX?
A : All are correct
Q : What can users do with the Immutable X APIs and SDKs?
A : All are correct
Q : Which scaling technology does Immutable X use?
A : ZK-Rollups
Q : Which statement best describes Immutable X?
A : A layer 2 scaling solution for NFTs on Ethereum.
Q : Which Immutable X feature can enhance the liquidity of NFT assets?
A : The Immutable X global order book
Q : What is Immutable X trying to achieve?
A : All are correct
Q : Which ZK proof does Immutable X use?
A : STARK proof
🟢 Multi
Q : What are the use cases of MULTI?
A : Governance and staking
Q : How many tokens are currently supported by Multichain?
A : 1000+
Q : What is the total supply of Multichain’s native token?
A : 100 M
Q : What are the solutions that Multichain offers for seamless transfer of assets?
A : Cross-Chain Bridges, Routers, and anyCall
Q : What is the native coin of Multichain?
A : MULTI
Q : How is consensus reached in Multichain?
A : Independent nodes that own part of a private key collectively sign transactions.
Q : Interoperability is the concept of independent blockchains being able to interact with each other.
A : true
Q : What benefits do users sending assets from one network to another enjoy?
A : All are correct.
Q : What’s the difference between Multichain’s bridges and routers?
A : Bridges enable interoperability between two chains while routers enable interoperability between any chain.
Quiz : I have noticed that....
Asnwer : False
Quiz : The main benefit of keeping ....
Answer : False
Quiz : Why KYC ?
Answer :
- Its part ...
- KYC improves ...
- KYC Check ...
- KYC proactively ...
Quiz : What is Cryptocurrency?
Answer : A Cryptocurrency is a form of digital cash that enable ....
‼️ Answer Harmony ‼️‼️
1. Why should tokens have a finite supply?
To avoid inflation and incentivize token appreciation
2. What consencys mechanism does harmony use?
Effective proff of stake
3. Which technologies does harmony implemet to achieve scalability without sacrificing security?
Sharding and effective proff of stake
4. What is harmonys yearly network reward to validators?
441 million tokens
5. Which of these DAOs have been funded by Harmony?
All are correct
6. What's makes up the yearly reward at harmony?
Issuance + transaction fees
7. Harmony has created bridges for which chains?
All are correct
8. How much Grant Will harmony provide to new projects through the harmony Ecosystem fund?
$300 Million
9. How many DAOs does Harmony aim to find in the future?
10,000
‼️ Answer QTUM.........‼️‼️
1. You can purchase QTUM on binance by:
All of the above
2. Holding QTUM allows you to vote on proposal. True or false?
False
3. When did the QTUM mainnet launch?
September 2017
4. Block rewards are split betweet:
Ten Super Staker
5. QTUM holders can delegate their UTXOs behind Staker Stakers thrugh
Offline staking
6. Qtum's account abstaction layer ia designed to:
Combine UTXO accounting with smart contract capabilities
7. When delegate QTUM behind a super Staker, a user must:
Provide their wallet address to a super Staker
8. QTUM combines
UTXO accounting
Smart Contract capabilities (select 2 answer)
‼️ Answer COTI..........
1. Select is the network(s) in which COTI operates:
All are correct
2. How does COTI keep ITS transaction fees low?
All are correct
3. What does COTI MultiDAG enable?
The ussuance of tokens on top of the trustchain protocol
4. The treasure distrubutes reward to COTI holders based on fees collected from:
All of COTI's product, including treasury, COTI pay bussines, Djed, and more
5. Which type of consensus algorithm is used on the COTI network?
PoT (proff of trust)
6. How can i earn rewards from the COTI ecosystem?
Deposit native COTI into the Treasury
7. COTI ia powering Djed, which is___ first algorithmic stablecoin
Cardano's
8. What is COTI?
A layer-1 blockchain Ecosystem designed for payments
New User must kyc
‼️ REEF........
Q:What consensus mechanism does the Reef ecosystem use?
A: Nominated Proof of Stake
Q:What does Reef stand for?
A:Reliable, Extensible, Efficient, Fast
Q:How much does the average transaction cost on Reef?
A: $0.17
Q:What does REEF-20 mean?
A:The native utility token that powers the Reef blockchain
Q:How many types of REEF tokens exist on the market?
A: 3
Q:What is Reef Finance?
A:A layer 1 blockchain for DeFi, NFTs, and gaming
Q:What is Reef's current max token supply?
A: There is no max supply
Q:What are the types of REEF tokens?
A:All of the options
Q:How many transactions per second (TPS) is Reef able to process?
A:Over 460 TPS
‼️ T.....
Q: Proxy Re-encryption allows the sharing of encrypted data without decryption of data or the sharing of private keys. True or False?
A: true
Q: tBTCv2 is a bridge between Bitcoin and ____?
A: Ethereum
Q: tBTCv2 is the only bridge bringing your Bitcoin to Ethereum that preserves open access and doesn't require you to trust a third party. True or False?
A: true
Q: What is NOT a feature of threshold cryptography?
A: Reliance on central authority (X)
Q: Proxy re-encryption is designed to ____?
A: Protect user data and enforce access controls
Q: Which are features of the Threshold Network?
A: All are correct.
Q: Threshold was created from the first-ever decentralized merger of the NuCypher and ___ Networks?
A: keep
Q: Threshold cryptography empowers users to no longer have to make a trade-off between usability and ____.
A: Privacy
‼️ Answer Harmony ‼️‼️
1. Why should tokens have a finite supply?
To avoid inflation and incentivize token appreciation
2. What consencys mechanism does harmony use?
Effective proff of stake
3. Which technologies does harmony implemet to achieve scalability without sacrificing security?
Sharding and effective proff of stake
4. What is harmonys yearly network reward to validators?
441 million tokens
5. Which of these DAOs have been funded by Harmony?
All are correct
6. What's makes up the yearly reward at harmony?
Issuance + transaction fees
7. Harmony has created bridges for which chains?
All are correct
8. How much Grant Will harmony provide to new projects through the harmony Ecosystem fund?
$300 Million
9. How many DAOs does Harmony aim to find in the future?
10,000
‼️ Answer QTUM.........‼️‼️
1. You can purchase QTUM on binance by:
All of the above
2. Holding QTUM allows you to vote on proposal. True or false?
False
3. When did the QTUM mainnet launch?
September 2017
4. Block rewards are split betweet:
Ten Super Staker
5. QTUM holders can delegate their UTXOs behind Staker Stakers thrugh
Offline staking
6. Qtum's account abstaction layer ia designed to:
Combine UTXO accounting with smart contract capabilities
7. When delegate QTUM behind a super Staker, a user must:
Provide their wallet address to a super Staker
8. QTUM combines
UTXO accounting
Smart Contract capabilities (select 2 answer)
‼️ Answer COTI..........
1. Select is the network(s) in which COTI operates:
All are correct
2. How does COTI keep ITS transaction fees low?
All are correct
3. What does COTI MultiDAG enable?
The ussuance of tokens on top of the trustchain protocol
4. The treasure distrubutes reward to COTI holders based on fees collected from:
All of COTI's product, including treasury, COTI pay bussines, Djed, and more
5. Which type of consensus algorithm is used on the COTI network?
PoT (proff of trust)
6. How can i earn rewards from the COTI ecosystem?
Deposit native COTI into the Treasury
7. COTI ia powering Djed, which is___ first algorithmic stablecoin
Cardano's
8. What is COTI?
A layer-1 blockchain Ecosystem designed for payments
New User must kyc
‼️ REEF........
Q:What consensus mechanism does the Reef ecosystem use?
A: Nominated Proof of Stake
Q:What does Reef stand for?
A:Reliable, Extensible, Efficient, Fast
Q:How much does the average transaction cost on Reef?
A: $0.17
Q:What does REEF-20 mean?
A:The native utility token that powers the Reef blockchain
Q:How many types of REEF tokens exist on the market?
A: 3
Q:What is Reef Finance?
A:A layer 1 blockchain for DeFi, NFTs, and gaming
Q:What is Reef's current max token supply?
A: There is no max supply
Q:What are the types of REEF tokens?
A:All of the options
Q:How many transactions per second (TPS) is Reef able to process?
A:Over 460 TPS
‼️ T.....
Q: Proxy Re-encryption allows the sharing of encrypted data without decryption of data or the sharing of private keys. True or False?
A: true
Q: tBTCv2 is a bridge between Bitcoin and ____?
A: Ethereum
Q: tBTCv2 is the only bridge bringing your Bitcoin to Ethereum that preserves open access and doesn't require you to trust a third party. True or False?
A: true
Q: What is NOT a feature of threshold cryptography?
A: Reliance on central authority (X)
Q: Proxy re-encryption is designed to ____?
A: Protect user data and enforce access controls
Q: Which are features of the Threshold Network?
A: All are correct.
Q: Threshold was created from the first-ever decentralized merger of the NuCypher and ___ Networks?
A: keep
Q: Threshold cryptography empowers users to no longer have to make a trade-off between usability and ____.
A: Privacy
RUNE
Q1) What is the native coin of THORChain?
Answer: RUNE
Q2) How many types of users are there in THORChain?
Answer: 4
Q3) What is the total supply of THORChain’s native coin?
Answer: 500 million
Q4) What are the use cases of THORChain’s native coin?
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