MessageFormat.Field (Java SE 12 & JDK 12 )
Keywords: java.text.MessageFormat.Field class

Module java.base
Package java.text

## Class MessageFormat.Field

- java.lang.Object
- - java.text.AttributedCharacterIterator.Attribute
  - - java.text.Format.Field
    - - java.text.MessageFormat.Field

- All Implemented Interfaces:
    `Serializable`
  Enclosing class:
    MessageFormat

      public static class MessageFormat.Field
      extends Format.Field

  Defines constants that are used as attribute keys in the `AttributedCharacterIterator` returned from `MessageFormat.formatToCharacterIterator`.
  Since:
    1.4
  See Also:
    Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `static MessageFormat.Field` | `ARGUMENT` | Constant identifying a portion of a message that was generated from an argument passed into `formatToCharacterIterator`.

    - ### Fields declared in class java.text.AttributedCharacterIterator.Attribute

      `INPUT_METHOD_SEGMENT, LANGUAGE, READING`

  - ### Constructor Summary

    Constructors
    Modifier | Constructor | Description
    --- | --- | ---
    `protected` | `Field​(String name)` | Creates a Field with the specified name.

  - ### Method Summary

    Modifier and Type | Method | Description
    --- | --- | ---
    `protected Object` | `readResolve()` | Resolves instances being deserialized to the predefined constants.

    - ### Methods declared in class java.text.AttributedCharacterIterator.Attribute

      `equals, getName, hashCode, toString`

    - ### Methods declared in class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### ARGUMENT

          public static final MessageFormat.Field ARGUMENT

      Constant identifying a portion of a message that was generated from an argument passed into `formatToCharacterIterator`. The value associated with the key will be an `Integer` indicating the index in the `arguments` array of the argument from which the text was generated.

  - ### Constructor Detail

    - #### Field

          protected Field​(String name)

      Creates a Field with the specified name.
      Parameters:
        `name` - Name of the attribute

  - ### Method Detail

    - #### readResolve

          protected Object readResolve()
                                throws InvalidObjectException

      Resolves instances being deserialized to the predefined constants.
      Overrides:
        `readResolve` in class `AttributedCharacterIterator.Attribute`
      Returns:
        resolved MessageFormat.Field constant
      Throws:
        `InvalidObjectException` - if the constant could not be resolved.