IT. Expert System.

Java Standard Edition (SE)

ObjectInputStream.GetField


compact1, compact2, compact3
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 and Description
      GetField() 
    • Method Summary

      All Methods Instance Methods Abstract 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.
    • 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


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