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ObjectStreamConstants (Java SE 20 & JDK 20)

  • STREAM_MAGIC

    static final short STREAM_MAGIC

    Magic number that is written to the stream header.

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  • STREAM_VERSION

    static final short STREAM_VERSION

    Version number that is written to the stream header.

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  • TC_BASE

    static final byte TC_BASE

    First tag value.

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  • TC_NULL

    static final byte TC_NULL

    Null object reference.

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  • TC_REFERENCE

    static final byte TC_REFERENCE

    Reference to an object already written into the stream.

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  • TC_CLASSDESC

    static final byte TC_CLASSDESC

    new Class Descriptor.

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  • TC_OBJECT

    static final byte TC_OBJECT

    new Object.

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  • TC_STRING

    static final byte TC_STRING

    new String.

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  • TC_ARRAY

    static final byte TC_ARRAY

    new Array.

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  • TC_CLASS

    static final byte TC_CLASS

    Reference to Class.

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  • TC_BLOCKDATA

    static final byte TC_BLOCKDATA

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

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  • TC_ENDBLOCKDATA

    static final byte TC_ENDBLOCKDATA

    End of optional block data blocks for an object.

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  • TC_RESET

    static final byte TC_RESET

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

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  • TC_BLOCKDATALONG

    static final byte TC_BLOCKDATALONG

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

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  • TC_EXCEPTION

    static final byte TC_EXCEPTION

    Exception during write.

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  • TC_LONGSTRING

    static final byte TC_LONGSTRING

    Long string.

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  • TC_PROXYCLASSDESC

    static final byte TC_PROXYCLASSDESC

    new Proxy Class Descriptor.

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  • TC_ENUM

    static final byte TC_ENUM

    new Enum constant.

    Since:
    1.5
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  • TC_MAX

    static final byte TC_MAX

    Last tag value.

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  • baseWireHandle

    static final int baseWireHandle

    First wire handle to be assigned.

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  • SC_WRITE_METHOD

    static final byte SC_WRITE_METHOD

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

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  • 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
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  • SC_SERIALIZABLE

    static final byte SC_SERIALIZABLE

    Bit mask for ObjectStreamClass flag. Indicates class is Serializable.

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  • SC_EXTERNALIZABLE

    static final byte SC_EXTERNALIZABLE

    Bit mask for ObjectStreamClass flag. Indicates class is Externalizable.

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  • SC_ENUM

    static final byte SC_ENUM

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

    Since:
    1.5
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  • SUBSTITUTION_PERMISSION

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

    Since:
    1.2
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  • SUBCLASS_IMPLEMENTATION_PERMISSION

    Enable overriding of readObject and writeObject.

    Since:
    1.2
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  • SERIAL_FILTER_PERMISSION

    Enable setting the system-wide serial filter.

    Since:
    9
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  • 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
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  • 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
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