Java Module java.base Package java.io Class ObjectInputStream.GetField（JDK11）

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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()`

Method Summary

All Methods Instance Methods Abstract Methods
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 Detail
  - GetField
```
public GetField()
```
- Method Detail
  - 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

Java Module java.base Package java.io Class ObjectInputStream.GetField（JDK11）

Class ObjectInputStream.GetField

Constructor Summary

Method Summary

Methods declared in class java.lang.Object

Constructor Detail

GetField

Method Detail

getObjectStreamClass

defaulted

get

get

get

get

get

get

get

get

get