# Package org.zkoss.stateless.util

- Interface Summary
  Interface | Description
  --- | ---
  ActionHandler | An interface to indicates an action handler functional.
  ActionHandler0 | Represents an action handler with no arguments.
  ActionHandler1<A> | Represents an action handler with one argument.
  ActionHandler2<A,​B> | Represents an action handler with two arguments.
  ActionHandler3<A,​B,​C> | Represents an action handler with three arguments.
  ActionHandler4<A,​B,​C,​D> | Represents an action handler with four arguments.
  ActionHandler5<A,​B,​C,​D,​E> | Represents an action handler with five arguments.
  ActionHandler6<A,​B,​C,​D,​E,​F> | Represents an action handler with six arguments.
  ActionHandler7<A,​B,​C,​D,​E,​F,​G> | Represents an action handler with seven arguments.
  ActionHandler8<A,​B,​C,​D,​E,​F,​G,​H> | Represents an action handler with eight arguments.
  ActionHandler9<A,​B,​C,​D,​E,​F,​G,​H,​I> | Represents an action handler with nine arguments.

- Class Summary
  Class | Description
  --- | ---
  BidirectionalMap<K,​V> | A bidirectional map is a map that preserves the uniqueness of its values as well as that of its keys.
  Oid | Oid generator