Package org.apache.struts2.inject.util

# Enum Class ReferenceType

java.lang.Object
java.lang.Enum<ReferenceType>
org.apache.struts2.inject.util.ReferenceType

All Implemented Interfaces:
  `Serializable`, `Comparable<ReferenceType>`, `Constable`

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`

- ## Nested Class Summary

  ## Nested classes/interfaces inherited from class java.lang.Enum

  `Enum.EnumDesc<E extends Enum<E>>`

- ## Enum Constant Summary

  Enum Constants
  Enum Constant
  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

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

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

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

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

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

- ## Enum Constant Details

  - ### 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 Details

  - ### values

    public static ReferenceType[] values()
    Returns an array containing the constants of this enum class, in the order they are declared.
    Returns:
      an array containing the constants of this enum class, in the order they are declared

  - ### valueOf

    public static ReferenceType valueOf(String name)
    Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (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 class has no constant with the specified name
      `NullPointerException` - if the argument is null