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The ObjectInputStream
and ObjectOutputStream
classes in Java are part of the Java Input/Output (I/O) system and are used for reading and writing objects, respectively. These classes are primarily designed for object serialization, which is the process of converting an object's state into a byte stream and reconstructing the object from that byte stream. Serialization is essential for scenarios like storing objects in files, sending objects over a network, or saving object states between different program executions.
ObjectOutputStream:
writeObject(Object obj)
, which writes the specified object to the underlying stream.ObjectInputStream:
readObject()
, which reads the next object from the input stream and returns it as a generic Object
. The caller must cast the returned object to its appropriate type.It's important to note that for an object to be serializable, its class must implement the Serializable
interface. This interface acts as a marker, indicating that the class can be serialized. If a class does not implement Serializable
, an exception (NotSerializableException
) will be thrown at runtime.
Here's a simple example of a serializable class:
These classes are powerful tools for handling object persistence and communication in Java, allowing objects to be easily saved, transmitted, and reconstructed.
Vivek Joglekar
Wroking in IT industry from last 15 years and and trained more than 5000+ Students. Conact ME
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