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Brane uses a set of immutable, type-safe primitives to represent Ethereum data.

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Address

Represents a 20-byte Ethereum address. It automatically handles checksum validation. 
import io.brane.core.types.Address;

// From Hex String
Address addr = new Address("0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266");

// To String (Checksummed)
String hex = addr.toString();

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Wei

Represents a monetary value in Wei (10^-18 Ether). It wraps BigInteger to prevent unit confusion. 
import io.brane.core.types.Wei;

// From Ether (String or BigDecimal)
Wei value = Wei.fromEther("1.5");

// From Gwei
Wei gasPrice = Wei.gwei(20);

// From Raw Wei (BigInteger)
Wei raw = Wei.of(1000);

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HexData

Represents arbitrary hex-encoded data (bytes). It is immutable and efficient. 
import io.brane.core.types.HexData;

// From Hex String
HexData data = new HexData("0x1234");

// From Byte Array
HexData fromBytes = new HexData(new byte[]{0x12, 0x34});

// Empty
HexData empty = HexData.EMPTY;