NOTE: We are going to use the UInt256 class for all examples, but the same behaviors are possible with the UInt384, UInt64, UInt32 classes.

We refer to those classes as UInt.

Creating Uints


You can initialize a UInt with the static method valueOf, with an integer, a long, or a BigInteger object. This only accepts positive values.

// from an int
UInt256 value = UInt256.valueOf(42);
// from a long
UInt256 value = UInt256.valueOf(42L);
// from a BigInteger
UInt256 value = UInt256.valueOf(BigInteger.ONE);


You can initialize a UInt from a Bytes object, using the fromBytes method.

UInt256 value = UInt256.fromBytes(Bytes.wrap(new byte[] {0x01, 0x02, 0x03}));


You can initialize a UInt from a string representing a hexadecimal encoding of bytes, with an optional prefix of 0x.

UInt256 value = UInt256.fromHexString("0xdeadbeef");