How Can I Serialize and Deserialize Java Objects to Byte Arrays?

Serializing and Deserializing Java Objects to Byte Arrays

In typical scenarios involving the transmission of data over networks, the need often arises to convert objects into byte arrays for efficient transfer. Understanding how to serialize and deserialize Java objects allows developers to effectively manage this data exchange, ensuring the integrity and functionality of transmitted objects.

Serialization

To serialize an object, there are tried and tested methods:

static byte[] serialize(final Object obj) {
    ByteArrayOutputStream bos = new ByteArrayOutputStream();

    try (ObjectOutputStream out = new ObjectOutputStream(bos)) {
        out.writeObject(obj);
        out.flush();
        return bos.toByteArray();
    } catch (Exception ex) {
        throw new RuntimeException(ex);
    }
}

Deserialization

Once the object has been serialized and transmitted, the receiving end can reconstruct it using the following approach:

static Object deserialize(byte[] bytes) {
    ByteArrayInputStream bis = new ByteArrayInputStream(bytes);

    try (ObjectInput in = new ObjectInputStream(bis)) {
        return in.readObject();
    } catch (Exception ex) {
        throw new RuntimeException(ex);
    }
}

By implementing these methods, developers can seamlessly convert their Java objects to byte arrays, transmit them over networks, and then deserialize them on the receiving end, preserving the object's state and enabling further processing.

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