Java Module java.base Package java.io Class ObjectStreamField（JDK11）

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.