# Class Synthetic

java.lang.Object
org.apache.bcel.classfile.Attribute
org.apache.bcel.classfile.Synthetic

All Implemented Interfaces:
  `Cloneable, Node`

public final class Synthetic extends Attribute
This class is derived from Attribute and declares this class as 'synthetic', i.e., it needs special handling. The JVM specification states "A class member that does not appear in the source code must be marked using a Synthetic attribute." It may appear in the ClassFile attribute table, a field_info table or a method_info table. This class is intended to be instantiated from the Attribute.readAttribute() method.

See Also:
  - `Attribute`

- ## Field Summary

  ### Fields inherited from class Attribute

  `constant_pool, EMPTY_ARRAY, length, name_index, tag`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `Synthetic(int nameIndex, int length, byte[] bytes, ConstantPool constantPool)`
  `Synthetic(Synthetic c)`
  Initialize from another object.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `accept(Visitor v)`
  Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class.
  `Attribute`
  `copy(ConstantPool constantPool)`
  `void`
  `dump(DataOutputStream file)`
  Dump source file attribute to file stream in binary format.
  `byte[]`
  `getBytes()`
  `void`
  `setBytes(byte[] bytes)`
  `String`
  `toString()`

  ### Methods inherited from class Attribute

  `addAttributeReader, addAttributeReader, clone, getConstantPool, getLength, getName, getNameIndex, getTag, println, readAttribute, readAttribute, removeAttributeReader, setConstantPool, setLength, setNameIndex`

  ### Methods inherited from class Object

  `equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- ## Constructor Details

  - ### Synthetic

    public Synthetic(int nameIndex, int length, byte[] bytes, ConstantPool constantPool)
    Parameters:
      `nameIndex` - Index in constant pool to CONSTANT_Utf8, which should represent the string "Synthetic".
      `length` - Content length in bytes - should be zero.
      `bytes` - Attribute contents
      `constantPool` - The constant pool this attribute is associated with.

  - ### Synthetic

    public Synthetic(Synthetic c)
    Initialize from another object. Note that both objects use the same references (shallow copy). Use copy() for a physical copy.
    Parameters:
      `c` - Source to copy.

- ## Method Details

  - ### accept

    public void accept(Visitor v)
    Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class. I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
    Specified by:
      `accept` in interface `Node`
    Specified by:
      `accept` in class `Attribute`
    Parameters:
      `v` - Visitor object

  - ### copy

    public Attribute copy(ConstantPool constantPool)
    Specified by:
      `copy` in class `Attribute`
    Parameters:
      `constantPool` - constant pool to save.
    Returns:
      deep copy of this attribute

  - ### dump

    public void dump(DataOutputStream file) throws IOException
    Dump source file attribute to file stream in binary format.
    Overrides:
      `dump` in class `Attribute`
    Parameters:
      `file` - Output file stream
    Throws:
      `IOException` - if an I/O error occurs.

  - ### getBytes

    public byte[] getBytes()
    Returns:
      data bytes.

  - ### setBytes

    public void setBytes(byte[] bytes)
    Parameters:
      `bytes` -

  - ### toString

    public String toString()
    Overrides:
      `toString` in class `Attribute`
    Returns:
      String representation.