Module java.base

Package java.io

Interface ObjectStreamConstants

All Known Implementing Classes:

ObjectInputStream, ObjectOutputStream

public interface ObjectStreamConstants

Constants written into the Object Serialization Stream.

Since:

1.1

Field Summary

Fields

Modifier and Type	Field	Description
static final int	baseWireHandle	First wire handle to be assigned.
static final int	PROTOCOL_VERSION_1	A Stream Protocol Version.
static final int	PROTOCOL_VERSION_2	A Stream Protocol Version.
static final byte	SC_BLOCK_DATA	Bit mask for ObjectStreamClass flag.
static final byte	SC_ENUM	Bit mask for ObjectStreamClass flag.
static final byte	SC_EXTERNALIZABLE	Bit mask for ObjectStreamClass flag.
static final byte	SC_SERIALIZABLE	Bit mask for ObjectStreamClass flag.
static final byte	SC_WRITE_METHOD	Bit mask for ObjectStreamClass flag.
static final SerializablePermission	SERIAL_FILTER_PERMISSION	Enable setting the system-wide serial filter.
static final short	STREAM_MAGIC	Magic number that is written to the stream header.
static final short	STREAM_VERSION	Version number that is written to the stream header.
static final SerializablePermission	SUBCLASS_IMPLEMENTATION_PERMISSION	Enable overriding of readObject and writeObject.
static final SerializablePermission	SUBSTITUTION_PERMISSION	Enable substitution of one object for another during serialization/deserialization.
static final byte	TC_ARRAY	new Array.
static final byte	TC_BASE	First tag value.
static final byte	TC_BLOCKDATA	Block of optional data.
static final byte	TC_BLOCKDATALONG	long Block data.
static final byte	TC_CLASS	Reference to Class.
static final byte	TC_CLASSDESC	new Class Descriptor.
static final byte	TC_ENDBLOCKDATA	End of optional block data blocks for an object.
static final byte	TC_ENUM	new Enum constant.
static final byte	TC_EXCEPTION	Exception during write.
static final byte	TC_LONGSTRING	Long string.
static final byte	TC_MAX	Last tag value.
static final byte	TC_NULL	Null object reference.
static final byte	TC_OBJECT	new Object.
static final byte	TC_PROXYCLASSDESC	new Proxy Class Descriptor.
static final byte	TC_REFERENCE	Reference to an object already written into the stream.
static final byte	TC_RESET	Reset stream context.
static final byte	TC_STRING	new String.

Field Details

STREAM_MAGIC

static final short STREAM_MAGIC

Magic number that is written to the stream header.

See Also:

• Constant Field Values

STREAM_VERSION

static final short STREAM_VERSION

Version number that is written to the stream header.

See Also:

• Constant Field Values

TC_BASE

static final byte TC_BASE

First tag value.

See Also:

• Constant Field Values

TC_NULL

static final byte TC_NULL

Null object reference.

See Also:

• Constant Field Values

TC_REFERENCE

static final byte TC_REFERENCE

Reference to an object already written into the stream.

See Also:

• Constant Field Values

TC_CLASSDESC

static final byte TC_CLASSDESC

new Class Descriptor.

See Also:

• Constant Field Values

TC_OBJECT

static final byte TC_OBJECT

new Object.

See Also:

• Constant Field Values

TC_STRING

static final byte TC_STRING

new String.

See Also:

• Constant Field Values

TC_ARRAY

static final byte TC_ARRAY

new Array.

See Also:

• Constant Field Values

TC_CLASS

static final byte TC_CLASS

Reference to Class.

See Also:

• Constant Field Values

TC_BLOCKDATA

static final byte TC_BLOCKDATA

Block of optional data. Byte following tag indicates number of bytes in this block data.

See Also:

• Constant Field Values

TC_ENDBLOCKDATA

static final byte TC_ENDBLOCKDATA

End of optional block data blocks for an object.

See Also:

• Constant Field Values

TC_RESET

static final byte TC_RESET

Reset stream context. All handles written into stream are reset.

See Also:

• Constant Field Values

TC_BLOCKDATALONG

static final byte TC_BLOCKDATALONG

long Block data. The long following the tag indicates the number of bytes in this block data.

See Also:

• Constant Field Values

TC_EXCEPTION

static final byte TC_EXCEPTION

Exception during write.

See Also:

• Constant Field Values

TC_LONGSTRING

static final byte TC_LONGSTRING

Long string.

See Also:

• Constant Field Values

TC_PROXYCLASSDESC

static final byte TC_PROXYCLASSDESC

new Proxy Class Descriptor.

See Also:

• Constant Field Values

TC_ENUM

static final byte TC_ENUM

new Enum constant.

Since:

1.5

See Also:

• Constant Field Values

TC_MAX

static final byte TC_MAX

Last tag value.

See Also:

• Constant Field Values

baseWireHandle

static final int baseWireHandle

First wire handle to be assigned.

See Also:

• Constant Field Values

SC_WRITE_METHOD

static final byte SC_WRITE_METHOD

Bit mask for ObjectStreamClass flag. Indicates a Serializable class defines its own writeObject method.

See Also:

• Constant Field Values

SC_BLOCK_DATA

static final byte SC_BLOCK_DATA

Bit mask for ObjectStreamClass flag. Indicates Externalizable data written in Block Data mode. Added for PROTOCOL_VERSION_2.

Since:

1.2

See Also:

• PROTOCOL_VERSION_2
• Constant Field Values

SC_SERIALIZABLE

static final byte SC_SERIALIZABLE

Bit mask for ObjectStreamClass flag. Indicates class is Serializable.

See Also:

• Constant Field Values

SC_EXTERNALIZABLE

static final byte SC_EXTERNALIZABLE

Bit mask for ObjectStreamClass flag. Indicates class is Externalizable.

See Also:

• Constant Field Values

SC_ENUM

static final byte SC_ENUM

Bit mask for ObjectStreamClass flag. Indicates class is an enum type.

Since:

1.5

See Also:

• Constant Field Values

SUBSTITUTION_PERMISSION

static final SerializablePermission SUBSTITUTION_PERMISSION

Enable substitution of one object for another during serialization/deserialization.

Since:

1.2

See Also:

• ObjectOutputStream.enableReplaceObject(boolean)
• ObjectInputStream.enableResolveObject(boolean)

SUBCLASS_IMPLEMENTATION_PERMISSION

static final SerializablePermission SUBCLASS_IMPLEMENTATION_PERMISSION

Enable overriding of readObject and writeObject.

Since:

1.2

See Also:

• ObjectOutputStream.writeObjectOverride(Object)
• ObjectInputStream.readObjectOverride()

SERIAL_FILTER_PERMISSION

static final SerializablePermission SERIAL_FILTER_PERMISSION

Enable setting the system-wide serial filter.

Since:

9

See Also:

• ObjectInputFilter.Config.setSerialFilter(ObjectInputFilter)

PROTOCOL_VERSION_1

static final int PROTOCOL_VERSION_1

A Stream Protocol Version.

All externalizable data is written in JDK 1.1 external data format after calling this method. This version is needed to write streams containing Externalizable data that can be read by pre-JDK 1.1.6 JVMs.

Since:

1.2

See Also:

• ObjectOutputStream.useProtocolVersion(int)
• Constant Field Values

PROTOCOL_VERSION_2

static final int PROTOCOL_VERSION_2

A Stream Protocol Version.

This protocol is written by JVM 1.2. Externalizable data is written in block data mode and is terminated with TC_ENDBLOCKDATA. Externalizable class descriptor flags has SC_BLOCK_DATA enabled. JVM 1.1.6 and greater can read this format change. Enables writing a nonSerializable class descriptor into the stream. The serialVersionUID of a nonSerializable class is set to 0L.

Since:

1.2

See Also:

• ObjectOutputStream.useProtocolVersion(int)
• SC_BLOCK_DATA
• Constant Field Values