- java.lang.Object
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- java.io.ObjectInputStream.GetField
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- Enclosing class:
- ObjectInputStream
public abstract static class ObjectInputStream.GetField extends Object
Provide access to the persistent fields read from the input stream.
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Constructor Summary
Constructors Constructor and Description ObjectInputStream.GetField()
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Method Summary
Methods Modifier and Type Method and 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 Object
get(String name, Object val)
Get the value of the named Object 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 ObjectStreamClass
getObjectStreamClass()
Get the ObjectStreamClass that describes the fields in the stream.
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Method Detail
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getObjectStreamClass
public abstract ObjectStreamClass getObjectStreamClass()
Get the ObjectStreamClass that describes the fields in the stream.- Returns:
- the descriptor class that describes the serializable fields
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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 underlyingInputStream
IllegalArgumentException
- ifname
does not correspond to a serializable field
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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 fieldval
- the default value to use ifname
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 underlyingInputStream
IllegalArgumentException
- if type ofname
is not serializable or if the field type is incorrect
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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 fieldval
- the default value to use ifname
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 underlyingInputStream
IllegalArgumentException
- if type ofname
is not serializable or if the field type is incorrect
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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 fieldval
- the default value to use ifname
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 underlyingInputStream
IllegalArgumentException
- if type ofname
is not serializable or if the field type is incorrect
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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 fieldval
- the default value to use ifname
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 underlyingInputStream
IllegalArgumentException
- if type ofname
is not serializable or if the field type is incorrect
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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 fieldval
- the default value to use ifname
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 underlyingInputStream
IllegalArgumentException
- if type ofname
is not serializable or if the field type is incorrect
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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 fieldval
- the default value to use ifname
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 underlyingInputStream
IllegalArgumentException
- if type ofname
is not serializable or if the field type is incorrect
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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 fieldval
- the default value to use ifname
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 underlyingInputStream
IllegalArgumentException
- if type ofname
is not serializable or if the field type is incorrect
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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 fieldval
- the default value to use ifname
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 underlyingInputStream
IllegalArgumentException
- if type ofname
is not serializable or if the field type is incorrect
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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 fieldval
- the default value to use ifname
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 underlyingInputStream
IllegalArgumentException
- if type ofname
is not serializable or if the field type is incorrect
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