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ObjectInputStream
deserializes objects, arrays, and other values from a stream that was
previously created with an ObjectOutputStream. The
readObject( ) method deserializes objects and
arrays (which should then be cast to the appropriate type); various
other methods read primitive data values from the stream. Note that
only objects that implement the Serializable or
Externalizable interface can be serialized and
deserialized.A class may implement its own private
readObject(ObjectInputStream) method to customize the way it is
deserialized. If you define such a method, there are several
ObjectInputStream methods you can use to help
deserialize the object. defaultReadObject( ) is
the easiest. It reads the content of the object just as an
ObjectInputStream would normally do. If you wrote
additional data before or after the default object contents, you
should read that data before or after calling
defaultReadObject( ). When working with multiple
versions or implementations of a class, you may have to deserialize a
set of
fields
that do not match the fields of your class. In this case, give your
class a static field named
serialPersistentFields whose value is an array of
ObjectStreamField objects that describe the fields
to be deserialized. If you do this, your readObject(
) method can call readFields( ) to read
the specified fields from the stream and return them in a
ObjectInputStream.GetField object. See
ObjectStreamField and
ObjectInputStream.GetField for more details.
Finally, you can call registerValidation(
) from a custom readObject(
) method. This method registers an
ObjectInputValidation object (typically the object
being deserialized) to be notified when a complete tree of objects
has been deserialized, and the original call to the
readObject( ) method of the
ObjectInputStream is about to return to its
caller.The remaining methods include miscellaneous stream-manipulation
methods and several protected methods for use by subclasses that want
to customize the deserialization behavior of
ObjectInputStream.
Figure 9-36. java.io.ObjectInputStream
public class ObjectInputStream extends InputStream implements ObjectInput,
ObjectStreamConstants {
// Public Constructors
public ObjectInputStream (InputStream in ) throws IOException;
// Protected Constructors
1.2 protected ObjectInputStream ( ) throws IOException, SecurityException;
// Nested Types
1.2 public abstract static class GetField ;
// Public Instance Methods
public void defaultReadObject ( ) throws IOException, ClassNotFoundException;
1.2 public ObjectInputStream.GetField readFields ( ) throws IOException,
ClassNotFoundException;
1.4 public Object readUnshared ( ) throws IOException, ClassNotFoundException;
public void registerValidation (ObjectInputValidation obj , int prio ) throws
NotActiveException, InvalidObjectException;
// Methods Implementing DataInput
public boolean readBoolean ( ) throws IOException;
public byte readByte ( ) throws IOException;
public char readChar ( ) throws IOException;
public double readDouble ( ) throws IOException;
public float readFloat ( ) throws IOException;
public void readFully (byte[ ] buf ) throws IOException;
public void readFully (byte[ ] buf , int off , int len ) throws IOException;
public int readInt ( ) throws IOException;
public long readLong ( ) throws IOException;
public short readShort ( ) throws IOException;
public int readUnsignedByte ( ) throws IOException;
public int readUnsignedShort ( ) throws IOException;
public String readUTF ( ) throws IOException;
public int skipBytes (int len ) throws IOException;
// Methods Implementing ObjectInput
public int available ( ) throws IOException;
public void close ( ) throws IOException;
public int read ( ) throws IOException;
public int read (byte[ ] buf , int off , int len ) throws IOException;
public final Object readObject ( ) throws IOException, ClassNotFoundException;
// Protected Instance Methods
protected boolean enableResolveObject (boolean enable ) throws SecurityException;
1.3 protected ObjectStreamClass readClassDescriptor ( ) throws IOException,
ClassNotFoundException;
1.2 protected Object readObjectOverride ( ) throws IOException,
ClassNotFoundException; constant
protected void readStreamHeader ( ) throws IOException, StreamCorruptedException;
protected Class<?> resolveClass (ObjectStreamClass desc ) throws IOException,
ClassNotFoundException;
protected Object resolveObject (Object obj ) throws IOException;
1.3 protected Class<?> resolveProxyClass (String[ ] interfaces ) throws IOException,
ClassNotFoundException;
// Deprecated Public Methods
# public String readLine ( ) throws IOException; Implements:DataInput
}
