Module java.base

Package java.io

Class ObjectInputStream.GetField

java.lang.Object

java.io.ObjectInputStream.GetField

Enclosing class:

ObjectInputStream

public abstract static class ObjectInputStream.GetField
extends Object

Provide access to the persistent fields read from the input stream.

Constructor Summary

Constructors

Constructor	Description
GetField()	Constructor for subclasses to call.

Method Summary

Modifier and Type	Method	Description
abstract boolean	defaulted(String name)	Return true if the named field is defaulted and has no value in this stream.
abstract boolean	get(String name, boolean val)	Get the value of the named boolean field from the persistent field.
abstract byte	get(String name, byte val)	Get the value of the named byte field from the persistent field.
abstract char	get(String name, char val)	Get the value of the named char field from the persistent field.
abstract double	get(String name, double val)	Get the value of the named double field from the persistent field.
abstract float	get(String name, float val)	Get the value of the named float field from the persistent field.
abstract int	get(String name, int val)	Get the value of the named int field from the persistent field.
abstract long	get(String name, long val)	Get the value of the named long field from the persistent field.
abstract short	get(String name, short val)	Get the value of the named short field from the persistent field.
abstract Object	get(String name, Object val)	Get the value of the named Object field from the persistent field.
abstract ObjectStreamClass	getObjectStreamClass()	Get the ObjectStreamClass that describes the fields in the stream.

Methods declared in class java.lang.Object

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

Constructor Details

GetField

public GetField()

Constructor for subclasses to call.

Method Details

getObjectStreamClass

public abstract ObjectStreamClass getObjectStreamClass()

Get the ObjectStreamClass that describes the fields in the stream.

Returns:

the descriptor class that describes the serializable fields

defaulted

public abstract boolean defaulted(String name)
                           throws IOException

Return true if the named field is defaulted and has no value in this stream.

Parameters:

name - the name of the field

Returns:

true, if and only if the named field is defaulted

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

IllegalArgumentException - if name does not correspond to a serializable field

get

public abstract boolean get(String name,
 boolean val)
                     throws IOException

Get the value of the named boolean field from the persistent field.

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named boolean field

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

IllegalArgumentException - if type of name is not serializable or if the field type is incorrect

get

public abstract byte get(String name,
 byte val)
                  throws IOException

Get the value of the named byte field from the persistent field.

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named byte field

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

IllegalArgumentException - if type of name is not serializable or if the field type is incorrect

get

public abstract char get(String name,
 char val)
                  throws IOException

Get the value of the named char field from the persistent field.

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named char field

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

IllegalArgumentException - if type of name is not serializable or if the field type is incorrect

get

public abstract short get(String name,
 short val)
                   throws IOException

Get the value of the named short field from the persistent field.

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named short field

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

IllegalArgumentException - if type of name is not serializable or if the field type is incorrect

get

public abstract int get(String name,
 int val)
                 throws IOException

Get the value of the named int field from the persistent field.

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named int field

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

IllegalArgumentException - if type of name is not serializable or if the field type is incorrect

get

public abstract long get(String name,
 long val)
                  throws IOException

Get the value of the named long field from the persistent field.

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named long field

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

IllegalArgumentException - if type of name is not serializable or if the field type is incorrect

get

public abstract float get(String name,
 float val)
                   throws IOException

Get the value of the named float field from the persistent field.

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named float field

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

IllegalArgumentException - if type of name is not serializable or if the field type is incorrect

get

public abstract double get(String name,
 double val)
                    throws IOException

Get the value of the named double field from the persistent field.

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named double field

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

IllegalArgumentException - if type of name is not serializable or if the field type is incorrect

get

public abstract Object get(String name,
 Object val)
                    throws IOException,
ClassNotFoundException

Get the value of the named Object field from the persistent field.

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named Object field

Throws:

ClassNotFoundException - Class of a serialized object cannot be found.

IOException - if there are I/O errors while reading from the underlying InputStream

IllegalArgumentException - if type of name is not serializable or if the field type is incorrect