# Uses of Class
org.apache.commons.configuration2.tree.DefaultExpressionEngine

Packages that use DefaultExpressionEngine
Package
Description
org.apache.commons.configuration2.tree
A package with helper and utility classes used by hierarchical configurations.

- ## Uses of DefaultExpressionEngine in org.apache.commons.configuration2.tree

  Fields in org.apache.commons.configuration2.tree declared as DefaultExpressionEngine
  Modifier and Type
  Field
  Description
  `static final DefaultExpressionEngine`
  DefaultExpressionEngine.`INSTANCE`
  A default instance of this class that is used as expression engine for hierarchical configurations per default.
  Methods in org.apache.commons.configuration2.tree that return DefaultExpressionEngine
  Modifier and Type
  Method
  Description
  `DefaultExpressionEngine`
  DefaultConfigurationKey.`getExpressionEngine()`
  Gets the associated default expression engine.
  Constructors in org.apache.commons.configuration2.tree with parameters of type DefaultExpressionEngine
  Modifier
  Constructor
  Description
  ``
  `DefaultConfigurationKey(DefaultExpressionEngine engine)`
  Creates a new instance of `DefaultConfigurationKey` and sets the associated expression engine.
  ``
  `DefaultConfigurationKey(DefaultExpressionEngine engine, String key)`
  Creates a new instance of `DefaultConfigurationKey` and sets the associated expression engine and an initial key.