Module java.base
Package java.io

Class 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.
    • 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