Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class MarshalledObject - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.rmi
Class MarshalledObject

java.lang.Object
  |
  +--java.rmi.MarshalledObject

public final class MarshalledObject
extends Object
implements Serializable

A MarshalledObject contains a byte stream with the serialized representation of an object given to its constructor. The get method returns a new copy of the original object, as deserialized from the contained byte stream. The contained object is serialized and deserialized with the same serialization semantics used for marshaling and unmarshaling parameters and return values of RMI calls: When the serialized form is created:

classes are annotated with a codebase URL from where the class can be loaded (if available), and
any remote object in the MarshalledObject is represented by a serialized instance of its stub.

When copy of the object is retrieved (via the get method), if the class is not available locally, it will be loaded from the appropriate location (specified the URL annotated with the class descriptor when the class was serialized.

MarshalledObject facilitates passing objects in RMI calls that are not automatically deserialized immediately by the remote peer.

Since:: JDK1.2
See Also:: Serialized Form

Constructor Summary

MarshalledObject(Object obj)
          Creates a new MarshalledObject that contains the serialized representation of the current state of the supplied object.

Method Summary

boolean equals(Object obj)
          Compares this MarshalledObject to another object.

Object get()
          Returns a new copy of the contained marshalledobject.

int hashCode()
          Return a hash code for this MarshalledObject.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MarshalledObject

public MarshalledObject(Object obj)
                 throws IOException

Creates a new MarshalledObject that contains the serialized representation of the current state of the supplied object. The object is serialized with the semantics used for marshaling parameters for RMI calls.

Parameters:: obj - the object to be serialized (must be serializable)
Throws:: IOException - if an IOException occurs; an IOException may occur if obj is not serializable.
Since:: JDK1.2

Method Detail

get

public Object get()
           throws IOException,
                  ClassNotFoundException

Returns a new copy of the contained marshalledobject. The internal representation is deserialized with the semantics used for unmarshaling paramters for RMI calls.

Returns:: a copy of the contained object
Throws:: IOException - if an IOException occurs while deserializing the object from its internal representation.; ClassNotFoundException - if a ClassNotFoundException occurs while deserializing the object from its internal representation. could not be found
Since:: JDK1.2

hashCode

public int hashCode()

Return a hash code for this MarshalledObject.

Overrides:: hashCode in class Object

Returns:: a hash code

equals

public boolean equals(Object obj)

Compares this MarshalledObject to another object. Returns true if and only if the argument refers to a MarshalledObject that contains exactly the same serialized representation of an object as this one does. The comparison ignores any class codebase annotation, meaning that two objects are equivalent if they have the same serialized representation except for the codebase of each class in the serialized representation.

Overrides:: equals in class Object

Parameters:: obj - the object to compare with this MarshalledObject
Returns:: true if the argument contains an equaivalent serialized object; false otherwise
Since:: JDK1.2