java.io

Class ObjectInputStream.GetField

Contents
  • Enclosing class:
    ObjectInputStream

    public abstract static class ObjectInputStream.GetField
extends Object
    Provide access to the persistent fields read from the input stream.

    • Constructor Detail

      • ObjectInputStream.GetField

        public ObjectInputStream.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

Document created the 11/06/2005, last modified the 04/03/2020
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