ObjectStreamClass (Java 2 Platform SE 5.0) - JDK 5 Documentation v1.5.0, Java 2 SDK 英文文档

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Java^TM 2 Platform
Standard Ed. 5.0

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java.io
Class ObjectStreamClass

java.lang.Object
  java.io.ObjectStreamClass

All Implemented Interfaces:: Serializable

public class ObjectStreamClass
extends Object
implements Serializable
extends Object
implements Serializable

Serialization's descriptor for classes. It contains the name and serialVersionUID of the class. The ObjectStreamClass for a specific class loaded in this Java VM can be found/created using the lookup method.

The algorithm to compute the SerialVersionUID is described in Object Serialization Specification, Section 4.4, Stream Unique Identifiers.

Since:: JDK1.1
See Also:: ObjectStreamField, Object Serialization Specification, Section 4, Class Descriptors, Serialized Form

Field Summary

static ObjectStreamField[] NO_FIELDS
          serialPersistentFields value indicating no serializable fields

Method Summary

Class<?> forClass()
          Return the class in the local VM that this version is mapped to.

ObjectStreamField getField(String name)
          Get the field of this class by name.

ObjectStreamField[] getFields()
          Return an array of the fields of this serializable class.

String getName()
          The name of the class described by this descriptor.

long getSerialVersionUID()
          Return the serialVersionUID for this class.

static ObjectStreamClass lookup(Class<?> cl)
          Find the descriptor for a class that can be serialized.

String toString()
          Return a string describing this ObjectStreamClass.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Summary
`static ObjectStreamField[]`	`NO_FIELDS` serialPersistentFields value indicating no serializable fields

Method Summary
`Class<?>`	`forClass()` Return the class in the local VM that this version is mapped to.
`ObjectStreamField`	`getField(String name)` Get the field of this class by name.
`ObjectStreamField[]`	`getFields()` Return an array of the fields of this serializable class.
`String`	`getName()` The name of the class described by this descriptor.
`long`	`getSerialVersionUID()` Return the serialVersionUID for this class.
`static ObjectStreamClass`	`lookup(Class<?> cl)` Find the descriptor for a class that can be serialized.
`String`	`toString()` Return a string describing this ObjectStreamClass.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

NO_FIELDS

public static final ObjectStreamField[] NO_FIELDS

serialPersistentFields value indicating no serializable fields

Method Detail

lookup

public static ObjectStreamClass lookup(Class<?> cl)

Find the descriptor for a class that can be serialized. Creates an ObjectStreamClass instance if one does not exist yet for class. Null is returned if the specified class does not implement java.io.Serializable or java.io.Externalizable.

Parameters:: cl - class for which to get the descriptor
Returns:: the class descriptor for the specified class

getName

public String getName()

The name of the class described by this descriptor.

Returns:: a String representing the fully qualified name of the class

getSerialVersionUID

public long getSerialVersionUID()

Return the serialVersionUID for this class. The serialVersionUID defines a set of classes all with the same name that have evolved from a common root class and agree to be serialized and deserialized using a common format. NonSerializable classes have a serialVersionUID of 0L.

Returns:: the SUID of the class described by this descriptor

forClass

public Class<?> forClass()

Return the class in the local VM that this version is mapped to. Null is returned if there is no corresponding local class.

Returns:: the Class instance that this descriptor represents

getFields

public ObjectStreamField[] getFields()

Return an array of the fields of this serializable class.

Returns:: an array containing an element for each persistent field of this class. Returns an array of length zero if there are no fields.
Since:: 1.2

getField

public ObjectStreamField getField(String name)

Get the field of this class by name.

Parameters:: name - the name of the data field to look for
Returns:: The ObjectStreamField object of the named field or null if there is no such named field.

toString

public String toString()

Return a string describing this ObjectStreamClass.

Overrides:: toString in class Object

Returns:: a string representation of the object.