# Uses of Class
java.beans.Expression

Packages that use Expression
Package
Description
java.beans
Contains classes related to developing beans -- components based on the JavaBeans architecture.

- ## Uses of Expression in java.beans

  Methods in java.beans that return Expression
  Modifier and Type
  Method
  Description
  `protected Expression`
  DefaultPersistenceDelegate.`instantiate(Object oldInstance, Encoder out)`
  This default implementation of the `instantiate` method returns an expression containing the predefined method name "new" which denotes a call to a constructor with the arguments as specified in the `DefaultPersistenceDelegate`'s constructor.
  `protected abstract Expression`
  PersistenceDelegate.`instantiate(Object oldInstance, Encoder out)`
  Returns an expression whose value is `oldInstance`.
  Methods in java.beans with parameters of type Expression
  Modifier and Type
  Method
  Description
  `void`
  Encoder.`writeExpression(Expression oldExp)`
  The implementation first checks to see if an expression with this value has already been written.
  `void`
  XMLEncoder.`writeExpression(Expression oldExp)`
  Records the Expression so that the Encoder will produce the actual output when the stream is flushed.