java.lang.Object
java.io.ObjectStreamClass
- All Implemented Interfaces:
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 Java Object Serialization Specification, Section 4.6, "Stream Unique Identifiers".
- Since:
- 1.1
- External Specifications
- See Also:
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Field Summary
Modifier and TypeFieldDescriptionstatic final ObjectStreamField[]
serialPersistentFields value indicating no serializable fields -
Method Summary
Modifier and TypeMethodDescriptionClass
<?> forClass()
Return the class in the local VM that this version is mapped to.Get the field of this class by name.Return an array of the fields of this serializable class.getName()
Returns the name of the class described by this descriptor.long
Return the serialVersionUID for this class.static ObjectStreamClass
Find the descriptor for a class that can be serialized.static ObjectStreamClass
Returns the descriptor for any class, regardless of whether it implementsSerializable
.toString()
Return a string describing this ObjectStreamClass.
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Field Details
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NO_FIELDS
serialPersistentFields value indicating no serializable fields
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Method Details
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lookup
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
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lookupAny
Returns the descriptor for any class, regardless of whether it implementsSerializable
.- Parameters:
cl
- class for which to get the descriptor- Returns:
- the class descriptor for the specified class
- Since:
- 1.6
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getName
Returns the name of the class described by this descriptor. This method returns the name of the class in the format that is used by theClass.getName()
method.- Returns:
- a string representing the name of the class
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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
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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
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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
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getField
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.
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toString
Return a string describing this ObjectStreamClass.
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