Module java.base
Package java.io

Class ObjectStreamField

  • All Implemented Interfaces:
    Comparable<Object>
    public class ObjectStreamField
extends Object
implements Comparable<Object>
    A description of a Serializable field from a Serializable class. An array of ObjectStreamFields is used to declare the Serializable fields of a class.
    Since:
    1.2
    See Also:
    ObjectStreamClass

    • Constructor Detail

      • ObjectStreamField

        public ObjectStreamField​(String name,
                         Class<?> type)
        Create a Serializable field with the specified type. This field should be documented with a serialField tag.
        Parameters:
        name - the name of the serializable field
        type - the Class object of the serializable field

      • ObjectStreamField

        public ObjectStreamField​(String name,
                         Class<?> type,
                         boolean unshared)
        Creates an ObjectStreamField representing a serializable field with the given name and type. If unshared is false, values of the represented field are serialized and deserialized in the default manner--if the field is non-primitive, object values are serialized and deserialized as if they had been written and read by calls to writeObject and readObject. If unshared is true, values of the represented field are serialized and deserialized as if they had been written and read by calls to writeUnshared and readUnshared.
        Parameters:
        name - field name
        type - field type
        unshared - if false, write/read field values in the same manner as writeObject/readObject; if true, write/read in the same manner as writeUnshared/readUnshared
        Since:
        1.4

    • Method Detail

      • getName

        public String getName()
        Get the name of this field.
        Returns:
        a String representing the name of the serializable field

      • getType

        public Class<?> getType()
        Get the type of the field. If the type is non-primitive and this ObjectStreamField was obtained from a deserialized ObjectStreamClass instance, then Object.class is returned. Otherwise, the Class object for the type of the field is returned.
        Returns:
        a Class object representing the type of the serializable field

      • getTypeCode

        public char getTypeCode()
        Returns character encoding of field type. The encoding is as follows: 
         B            byte
 C            char
 D            double
 F            float
 I            int
 J            long
 L            class or interface
 S            short
 Z            boolean
 [            array
        Returns:
        the typecode of the serializable field

      • getTypeString

        public String getTypeString()
        Return the JVM type signature.
        Returns:
        null if this field has a primitive type.

      • getOffset

        public int getOffset()
        Offset of field within instance data.
        Returns:
        the offset of this field
        See Also:
        setOffset(int)

      • setOffset

        protected void setOffset​(int offset)
        Offset within instance data.
        Parameters:
        offset - the offset of the field
        See Also:
        getOffset()

      • isPrimitive

        public boolean isPrimitive()
        Return true if this field has a primitive type.
        Returns:
        true if and only if this field corresponds to a primitive type

      • isUnshared

        public boolean isUnshared()
        Returns boolean value indicating whether or not the serializable field represented by this ObjectStreamField instance is unshared.
        Returns:
        true if this field is unshared
        Since:
        1.4

      • compareTo

        public int compareTo​(Object obj)
        Compare this field with another ObjectStreamField. Return -1 if this is smaller, 0 if equal, 1 if greater. Types that are primitives are "smaller" than object types. If equal, the field names are compared.
        Specified by:
        compareTo in interface Comparable<Object>
        Parameters:
        obj - the object to be compared.
        Returns:
        a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object.

      • toString

        public String toString()
        Return a string that describes this field.
        Overrides:
        toString in class Object
        Returns:
        a string representation of the object.