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.

Constructors

GetField

public GetField()

Methods

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

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:

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