Ethereum | Ethereum develops HelloWorld for Java | Cryptocurrency library

by zhangbincheng1997 Java Version: Current License: No License

X-Ray Key Features Code Snippets(1)Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | Ethereum Summary

Ethereum is a Java library typically used in Blockchain, Cryptocurrency, Ethereum applications. Ethereum has no bugs, it has no vulnerabilities and it has low support. However Ethereum build file is not available. You can download it from GitHub.

Ethereum develops HelloWorld for Java

Support

Quality

Security

License

Reuse

Support

Ethereum has a low active ecosystem.

It has 219 star(s) with 94 fork(s). There are 18 watchers for this library.

It had no major release in the last 6 months.

There are 0 open issues and 10 have been closed. On average issues are closed in 238 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of Ethereum is current.

Quality

Ethereum has no bugs reported.

Security

Ethereum has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

Ethereum does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

Reuse

Ethereum releases are not available. You will need to build from source code and install.

Ethereum has no build file. You will be need to create the build yourself to build the component from source.

Installation instructions are not available. Examples and code snippets are available.

Top functions reviewed by kandi - BETA

kandi has reviewed Ethereum and discovered the below as its top functions. This is intended to give you an instant insight into Ethereum implemented functionality, and help decide if they suit your requirements.

Entry point to the client
Executes a GET command
Executes a set of values
Creates a new HelloWorld
Main entry point
Creates a remote world call

Get all kandi verified functions for this library.

Ethereum Key Features

No Key Features are available at this moment for Ethereum.

Ethereum Examples and Code Snippets

Get Ethereum balance

java

Lines of Code : 9

License : Permissive (MIT License)

Copy

public EthGetBalance getEthBalance() {
        EthGetBalance result = new EthGetBalance();
        try {
            result = this.web3j.ethGetBalance(DEFAULT_ADDRESS, DefaultBlockParameter.valueOf("latest")).sendAsync().get();
        } catch (Excep

Community Discussions

Trending Discussions on Ethereum

Making sense of injected components wrapped in an if statement

Must all nodes on the blockchain execute every smart contract function cal?

I have an error when reading a method with web3 (call)

I am trying to execute a swap on Pancakeswap using web3, but I get an error when calculating transaction cost

How to change names of scraped images with Python?

Tron Network with OpenZeppelin Contracts

Can Smart Contract access Data of other Blockchains?

Extract all the JSON data using Kotlin Android Studio

Coinbase API getBalance ignoring ETC currency

Solidity - TypeError: Overriding function is missing "override" specifier

QUESTION

Making sense of injected components wrapped in an if statement

Asked 2021-Jun-11 at 21:36

I have the following return statement in an App.jsx

...

ANSWER

Answered 2021-Jun-11 at 21:36

result is by default undefined since no initial state is provided:

Source https://stackoverflow.com/questions/67943647

QUESTION

Must all nodes on the blockchain execute every smart contract function cal?

Asked 2021-Jun-11 at 08:41

I understand why it's important that all nodes on the Ethereum mainnet must execute any smart contract function call which changes the internal state of the contract or the chain. (For example, transfers from one account to another ec.)

What I'm wondering is, if its true that every node must execute every function called on any smart contract, even if the function doesn't result in a state change.

For example, if an ERC721 smart contract has a function "getName()" which just returns the name of the artwork the NFT represents which is stored in the NFt. Let's say joe connects to the network, and wants executes getName() on a contract. Does that mean that all 9,000 nodes end up spinning cycles executing getName(), even though Joe only needs it to be executed once? Does the gas cost of running "getName()" compensate each of the nodes for the overhead of running "getName()"? If that is true (that every node gets paid) will gas get even more expensive as more nodes join the pool?

Is one of the reasons gas prices are high is because of the inefficiency of every node having to execute every function called on a smart contract, even those that have no effect on state?

If so it would seem to be a very (and perhaps unnecessarily) expensive proposition to execute a computationally intensive but "pure" (no side effects) function on Ethereum, right?

Thanks. apologies for the possibly naive question!

...

ANSWER

Answered 2021-Jun-11 at 08:41

There's a difference between a transaction (can make state changes - but doesn't need to), and a call (read-only, cannot make state changes).

I'll start with the call simply because it's easier.

When a node performs a call, it executes the contract function that most likely reads from storage, stores to memory, and returns from memory.

Example:

Source https://stackoverflow.com/questions/67930178

QUESTION

I have an error when reading a method with web3 (call)

Asked 2021-Jun-11 at 07:16

I am trying to learn how to integrate with web3 but I am having some problems. (normal I just started)

But there is a problem that I can't solve.

Uncaught TypeError: Cannot read property 'retrieve' of undefined

I try to call a function but it does not work and I do not know how to solve it.

Here is the code:

...

ANSWER

Answered 2021-Jun-11 at 07:16

You need to instantiate the web3js.eth.Contract class with the new keyword.

Source https://stackoverflow.com/questions/67931962

QUESTION

I am trying to execute a swap on Pancakeswap using web3, but I get an error when calculating transaction cost

Asked 2021-Jun-10 at 12:19

I am new at ethereum development and I am working on a simple script to execute swaps using Pancakeswap. Everything seems to be working well up to the point where I am building my transaction and calculate the tx-cost. I am using the UniswapRouterV02 abi create my Pancakeswap contract. The code:

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ANSWER

Answered 2021-May-06 at 13:26

In turns out that with web3 it is not possible to interact with the Pancakeswap contract. I found a solution using ethers.js. Following code worked for me to execute a swap on Pancake on mainnet. Before executing the first transaction Pancakeswap needs to be allowed, this code is commented out. I had to play around with the gasprice and gasLimit a bit to make it work.

Source https://stackoverflow.com/questions/67341080

QUESTION

How to change names of scraped images with Python?

Asked 2021-Jun-10 at 12:08

So I need to download the images of every coin on the list on CoinGecko, so I wrote the following code:

...

ANSWER

Answered 2021-Jun-10 at 11:05

I believe you could achieve this very easily using string slicing:

Source https://stackoverflow.com/questions/67919710

QUESTION

Tron Network with OpenZeppelin Contracts

Asked 2021-Jun-07 at 13:33

The Tron Network uses Solidity and has a lot of similarities to Ethereum.

I'm trying to use the OpenZeppelin contracts designed for Ethereum to run on the Tron Network.

I've chosen Solidity version 0.6.x which is supported by the tronbox compiler.

Is it possible to run OpenZeppelin contracts on the Tron Network?

...

ANSWER

Answered 2021-Jun-07 at 13:33

Is it possible to run OpenZeppelin contracts on the Tron Network?

Yes. For example this token uses an OpenZeppelin implementation of ERC20.

Source https://stackoverflow.com/questions/67872536

QUESTION

Can Smart Contract access Data of other Blockchains?

Asked 2021-Jun-06 at 21:42

Lets say i created an erc20 token. Now i want to make a smart contract that sends 1 coin to a user if they have X coins on another blockchain like bitcoin. Would that work? Can i read data from other blockchains using a cardano/ethereum/any other smart contract?

...

ANSWER

Answered 2021-Jun-06 at 21:42

There are some bridge applications that allow you to perform cross-chain operations (mostly run by exchanges). But these are operated on a different layer, unrelated to smart contracts.

What you're asking is not possible if you want to stick strictly to smart contracts.

However, you can use the oracle pattern. Create an off-chain app (the oracle) that listens to transactions from your contract to a specific address. Each transaction (from your contract to the target address) will trigger an action in the off-chain app - e.g. reading Bitcoin data. The oracle then sends another transaction to your smart contract, passing it the off-chain data.

Source https://stackoverflow.com/questions/67863614

QUESTION

Extract all the JSON data using Kotlin Android Studio

Asked 2021-Jun-06 at 12:00

I'm using Volley library to communicate with my API. I'm pretty new to Android and Kotlin and I'm really confused about extracting keys from the following JSON data

...

ANSWER

Answered 2021-Jun-06 at 12:00

I found it, I just used the getJSONObject() method to make it work

Source https://stackoverflow.com/questions/67858782

QUESTION

Coinbase API getBalance ignoring ETC currency

Asked 2021-Jun-05 at 14:21

The PHP uses the Coinbase API to get the current balance and list what currencies the account has money in. It has been used for a few weeks now, but since swapping one currency into ETC (Ethereum Classic), the balance ignores this currency. It works for all other currencies I have tried, so what is special about ETC that Coinbase is not returing anything via the API. The coinbase website portfolio does report the ETC balance correctly, so it's definitely a API issue.

...

ANSWER

Answered 2021-Jun-05 at 14:21

The issue came down to pagination:

The fix therefore was to set the pagination limit to 100 (max allowed).

The default is 24, hence why the returned list was incomplete.

$accounts = $client->getAccounts(['limit' => 100]);

Source https://stackoverflow.com/questions/67138479

QUESTION

Solidity - TypeError: Overriding function is missing "override" specifier

Asked 2021-Jun-03 at 08:50

I am creating a Smart Contract (BEP20 token) based on the BEP20Token template (https://github.com/binance-chain/bsc-genesis-contract/blob/master/contracts/bep20_template/BEP20Token.template). The public contructor was modified to add some token details. However all of the standard functions are giving compile time issues like Overriding function is missing.

** here is the source code **

...

ANSWER

Answered 2021-May-11 at 13:28

Constructor public () - Warning: Visibility for constructor is ignored. If you want the contract to be non-deployable, making it "abstract" is sufficient.

The warning message says it all. You can safely remove the public visibility modifier because it's ignored anyway.

If you marked the BEP20Token contract abstract, you would need to have a child contract inheriting from it, could not deploy the BEP20Token itself, but would have to deploy the child contract. Which is not what you want in this case.

Source https://stackoverflow.com/questions/67485324

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install Ethereum

You can download it from GitHub.
You can use Ethereum like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the Ethereum component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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