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## java.awt.event
Interface HierarchyListener

All Superinterfaces:
  EventListener

All Known Implementing Classes:
  AWTEventMulticaster

public interface HierarchyListener
extends EventListener

The listener interface for receiving hierarchy changed events. The class that is interested in processing a hierarchy changed event should implement this interface. The listener object created from that class is then registered with a Component using the Component's `addHierarchyListener` method. When the hierarchy to which the Component belongs changes, the `hierarchyChanged` method in the listener object is invoked, and the `HierarchyEvent` is passed to it.

Hierarchy events are provided for notification purposes ONLY; The AWT will automatically handle changes to the hierarchy internally so that GUI layout, displayability, and visibility work properly regardless of whether a program registers a `HierarchyListener` or not.

Since:
  1.3
See Also:
  `HierarchyEvent`

Method Summary
`void` | `hierarchyChanged(HierarchyEvent e)` Called when the hierarchy has been changed.

Method Detail

### hierarchyChanged

    public void hierarchyChanged(HierarchyEvent e)

  Called when the hierarchy has been changed. To discern the actual type of change, call `HierarchyEvent.getChangeFlags()`.
  See Also:
    `HierarchyEvent.getChangeFlags()`

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