com.opensymphony.xwork2.inject.util

## Enum ReferenceType

- java.lang.Object
- - java.lang.Enum<ReferenceType>
  - - com.opensymphony.xwork2.inject.util.ReferenceType

- All Implemented Interfaces:
    Serializable, Comparable<ReferenceType>

      public enum ReferenceType
      extends Enum<ReferenceType>

  Reference type. Used to specify what type of reference to keep to a referent.
  Author:
    crazybob@google.com (Bob Lee)
  See Also:
    `Reference`

- - ### Enum Constant Summary

    Enum Constants
    Enum Constant and Description
    `PHANTOM` Similar to weak references except the garbage collector doesn't actually reclaim the referent.
    `SOFT` Referent reclaimed in an LRU fashion when the VM runs low on memory and no strong references exist.
    `STRONG` Prevents referent from being reclaimed by the garbage collector.
    `WEAK` Referent reclaimed when no strong or soft references exist.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `static ReferenceType` | `valueOf(String name)` Returns the enum constant of this type with the specified name.
    `static ReferenceType[]` | `values()` Returns an array containing the constants of this enum type, in the order they are declared.

    - ### Methods inherited from class java.lang.Enum

      `clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf`

    - ### Methods inherited from class java.lang.Object

      `getClass, notify, notifyAll, wait, wait, wait`

- - ### Enum Constant Detail

    - #### STRONG

          public static final ReferenceType STRONG

      Prevents referent from being reclaimed by the garbage collector.

    - #### SOFT

          public static final ReferenceType SOFT

      Referent reclaimed in an LRU fashion when the VM runs low on memory and no strong references exist.
      See Also:
        `SoftReference`

    - #### WEAK

          public static final ReferenceType WEAK

      Referent reclaimed when no strong or soft references exist.
      See Also:
        `WeakReference`

    - #### PHANTOM

          public static final ReferenceType PHANTOM

      Similar to weak references except the garbage collector doesn't actually reclaim the referent. More flexible alternative to finalization.
      See Also:
        `PhantomReference`

  - ### Method Detail

    - #### values

          public static ReferenceType[] values()

      Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

          for (ReferenceType c : ReferenceType.values())
              System.out.println(c);

      Returns:
        an array containing the constants of this enum type, in the order they are declared

    - #### valueOf

          public static ReferenceType valueOf(String name)

      Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
      Parameters:
        `name` - the name of the enum constant to be returned.
      Returns:
        the enum constant with the specified name
      Throws:
        `IllegalArgumentException` - if this enum type has no constant with the specified name
        `NullPointerException` - if the argument is null

Copyright © 2000–2019 Apache Software Foundation. All rights reserved.