Specialized Types

​AccountId​
An AccountId is composed of a <shardNum>.<realmNum>.<accountNum> (eg. 0.0.10).
Shard number (shardNum) represents the shard number (shardId). It will default to 0 today, as Hedera only performs in one shard.
Realm number (realmNum) represents the realm number (realmId). It will default to 0 today, as realms are not yet supported.
Account represents either an account number or an account alias
Account number (accountNum) represents the account number (accountId)
Account alias (alias) represented by the public key bytes
The public key bytes are the result of serializing a protobuf Key message for any primitive key type
Currently, only primitive key bytes are supported as an alias
Threshold keys, key list, contract ID, and delegatable_contract_id are not supported
The alias can only be used in place of an account ID in transfer transactions in its current version
Together these values make up your AccountId. When an AccountId is specified, be sure all three values are included.
Constructor
Constructor
Type
Description
new AccountId(<shardNum>,<realmNum>,<accountNum>)
long, long, long
Constructs an AccountId with 0 for shardNum and realmNum (e.g., 0.0.<accountNum>)
Methods
Methods
Type
Description
AccountId.fromString(<account>)
String
Constructs an AccountId from a string formatted as <shardNum>.<realmNum>.<accountNum>
AccountId.fromSolidityAddress(<address>)
String
Constructs an AccountId from a solidity address in string format
AccountId.fromBytes(bytes)
byte[]
Constructs an AccountId from bytes
AccountId.toSolidityAddress()
String
Constructs a solidity address from AccountID
AccountId.toString()
String
Constructs an AccountID from string
AccountId.aliasKey
PublicKey
The alias key of the AccountID
AccountId.aliasEvmAddress
EVM address
The EVM address of the AccountID
AccountId.toBytes()
byte[]
Constructs an AccountID from bytes
Example
Java
JavaScript
Go
AccountId accountId = new AccountId(0 ,0 ,10);
System.out.println(accountId);
​
// Constructs an accountId from String
AccountId accountId = AccountId.fromString("0.0.10");
System.out.println(accountId);
const accountId = new AccountId(100);
console.log(`${accountId}`);
​
// Construct accountId from String
const accountId = AccountId.fromString(`100`);
console.log(`${accountId}`);
hedera.AccountIDFromString("0.0.3")
​FileId​
A FileId is composed of a <shardNum>.<realmNum>.<fileNum> (eg. 0.0.15).
shardNum represents the shard number (shardId). It will default to 0 today, as Hedera only performs in one shard.
realmNum represents the realm number (realmId). It will default to 0 today, as realms are not yet supported.
fileNum represents the file number
Together these values make up your accountId. When an FileId is requested, be sure all three values are included.
Constructor
Constructor
Type
Description
new FileId(<shardNum>,<realmNum>,<fileNum>)
long, long, long
Constructs a FileId with 0 for shardNum and realmNum (e.g., 0.0.<fileNum>)
Methods
Methods
Type
Description
FileId.fromString()
String
Constructs an FileId from a string formatted as
<shardNum>.<realmNum>.<fileNum>
FileId.fromSolidityAddress()
String
Constructs an FileId from a solidity address in string format
FileId.ADDRESS_BOOK
FileId
The public node address book for the current network
FileId.EXCHANGE_RATES
FileId
The current exchange rate of HBAR to USD
FileId.FEE_SCHEDULE
FileId
The current fee schedule for the network
Example
Java
JavaScript
Go
FileId fileId = new FileId(0,0,15);
System.out.println(fileId);
​
//Constructs a FileId from string
FileId fileId = FileId.fromString("0.0.15");
System.out.println(fileId);
const newFileId = new FileId(100);
console.log(`${newFileId}`);
​
//Construct a fileId from a String
const newFileIdFromString = FileId.fromString(`100`); 
console.log(`${newFileIdFromString}`);
hedera.FileIDFromString("0.0.3")
​ContractId​
A ContractId is composed of a <shardNum>.<realmNum>.<contractNum> (eg. 0.0.20).
shardNum represents the shard number (shardId). It will default to 0 today, as Hedera only performs in one shard.
realmNum represents the realm number (realmId). It will default to 0 today, as realms are not yet supported.
contractNum represents the contract number
Together these values make up your ContractId. When an ContractId is requested, be sure all three values are included. ContractId's are automatically assigned when you create a new smart contract.
Constructor
Constructor
Type
Description
new ContractId(<shardNum>,<realmNum>,<contractNum>)
long, long, long
Constructs a ContractId with 0 for shardNum and realmNum (e.g., 0.0.<contractNum>)
Methods
Methods
Type
Description
ContractId.fromString(<account>)
String
Constructs a ContractId from a string formatted as
<shardNum>.<realmNum>.<contractNum>
ContractId.fromSolidityAddress(<address>)[deprecated use ConractId.fromEvmAddress()]
String
Constructs a ContractId from a solidity address in string format [deprecated use ContractId.fromEvmAddres()]
ContractId.toSolidityAddress(<contractId>)
String
Contruct a Solidity address from a Hedera contract ID
ContractId.fromEvmAddress(<shard>, <realm>, <evmAddress>)
long, long, String
Constructs a ContractId from evm address
Example
Java
JavaScript
Go
ContractId contractId = new ContractId(0,0,20);
System.out.println(contractId);
​
// Constructs a ContractId from string
ContractId contractId = ContractId.fromString("0.0.20");
System.out.println(contractId);
const newContractId = new ContractId(100);
console.log(`${newContractId}`);
​
// Construct a contractId from a String
const newContractId = ContractId.fromString(`100`); 
console.log(`${newContractId}`);
hedera.ContractIDFromString("0.0.3")
​TopicId​
A topicId is composed of a <shardNum>.<realmNum>.<topicNum> (eg. 0.0.100).
shardNum represents the shard number (shardId). It will default to 0 today, as Hedera only performs in one shard.
realmNum represents the realm number (realmId). It will default to 0 today, as realms are not yet supported.
topicNum represents the topic number (topicId)
Constructor
Constructor
Type
Description
new ConsensusTopicId(<shardNum>,<realmNum>,<topicNum>)
long, long, long
Constructs a TopicId with 0 for shardNum and realmNum (e.g., 0.0.<topicNum>)
Methods
Type
Description
fromString(<topic>)
String
Constructs a topic ID from a String
ConsensusTopicId.toString()
​
Constructs a topic ID to String format
Example
Java
JavaScript
Go
ConsensusTopicId topicId = new ConsensusTopicId(0,0,100);
System.out.println(topicId)
const topicId = new ConsensusTopicId(0,0,100);
console.log(topicId)
hedera.TopicIDFromString("0.0.3")

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Pseudorandom Number Generator

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AccountId

Constructor

Methods

Example

FileId

Constructor

Methods

Example

ContractId

Constructor

Methods

Example

TopicId

Constructor

Example

​AccountId​

Constructor

Methods

Example

​FileId​

Constructor

Methods

Example

​ContractId​

Constructor

Methods

Example

​TopicId​

Constructor

Example

AccountId

FileId

ContractId

TopicId