Java - ObjectStreamClass

Last Updated : 17 Mar 2025

ObjectStreamClass act as a Serialization descriptor for class. This class contains the name and serialVersionUID of the class.

Fields

Modifier and Type	Field	Description
static ObjectStreamField[]	NO_FIELDS	serialPersistentFields value indicating no serializable fields

Methods

Modifier and Type	Method	Description
Class<?>	forClass()	It returns the class in the local VM that this version is mapped to.
ObjectStreamField	getField(String name)	It gets the field of this class by name.
ObjectStreamField[]	getFields()	It returns an array of the fields of this serialization class.
String	getName()	It returns the name of the class described by this descriptor.
long	getSerialVersionUID()	It returns the serialVersionUID for this class.
Static ObjectStreamClass	lookup(Class<?> cl)	It finds the descriptor for a class that can be serialized.
Static ObjectStreamClass	lookupAny(Class<?> cl)	It returns the descriptor for any class, regardless of whether it implements Serializable.
String	toString()	It returns a string describing this ObjectStreamClass.

Example

import java.io.ObjectStreamClass;
import java.util.Calendar;

public class ObjectStreamClassExample {
	public static void main(String[] args) {

		// create a new object stream class for Integers
		ObjectStreamClass osc = ObjectStreamClass.lookup(SmartPhone.class);

		// get the value field from ObjectStreamClass for integers
		System.out.println("" + osc.getField("price"));

		// create a new object stream class for Calendar
		ObjectStreamClass osc2 = ObjectStreamClass.lookup(String.class);

		// get the Class instance for osc2
		System.out.println("" + osc2.getField("hash"));

	}
}

Output:

I price
null

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