ActionMap (Java SE 15 & JDK 15) (original) (raw)

All Implemented Interfaces:

[Serializable](../../../java.base/java/io/Serializable.html "interface in java.io")

Direct Known Subclasses:

[ActionMapUIResource](plaf/ActionMapUIResource.html "class in javax.swing.plaf")

public class ActionMap extends Object implements Serializable

ActionMap provides mappings fromObjects (called keys or Action names) to Actions. An ActionMap is usually used with an InputMap to locate a particular action when a key is pressed. As with InputMap, an ActionMap can have a parent that is searched for keys not defined in the ActionMap.

As with InputMap if you create a cycle, eg:

ActionMap am = new ActionMap(); ActionMap bm = new ActionMap(): am.setParent(bm); bm.setParent(am);

some of the methods will cause a StackOverflowError to be thrown.

Since:

1.3

See Also:

InputMap

• Constructor Summary

Constructors

• Method Summary

Methods declared in class java.lang.Object

[clone](../../../java.base/java/lang/Object.html#clone%28%29), [equals](../../../java.base/java/lang/Object.html#equals%28java.lang.Object%29), [finalize](../../../java.base/java/lang/Object.html#finalize%28%29), [getClass](../../../java.base/java/lang/Object.html#getClass%28%29), [hashCode](../../../java.base/java/lang/Object.html#hashCode%28%29), [notify](../../../java.base/java/lang/Object.html#notify%28%29), [notifyAll](../../../java.base/java/lang/Object.html#notifyAll%28%29), [toString](../../../java.base/java/lang/Object.html#toString%28%29), [wait](../../../java.base/java/lang/Object.html#wait%28%29), [wait](../../../java.base/java/lang/Object.html#wait%28long%29), [wait](../../../java.base/java/lang/Object.html#wait%28long,int%29)

• Constructor Details

  • ActionMap

  public ActionMap()
  Creates an ActionMap with no parent and no mappings.

• Method Details

  • setParent

  public void setParent​(ActionMap map)
  Sets this ActionMap's parent.
  Parameters:
  map - the ActionMap that is the parent of this one

  • getParent

  Returns this ActionMap's parent.
  Returns:
  the ActionMap that is the parent of this one, or null if this ActionMap has no parent

  • put

  Adds a binding for key to action. If action is null, this removes the current binding for key.
  In most instances, key will beaction.getValue(NAME).
  Parameters:
  key - a key
  action - a binding for key

  • get

  Returns the binding for key, messaging the parent ActionMap if the binding is not locally defined.
  Parameters:
  key - a key
  Returns:
  the binding for key

  • remove

  public void remove​(Object key)
  Removes the binding for key from this ActionMap.
  Parameters:
  key - a key

  • clear

  public void clear()
  Removes all the mappings from this ActionMap.

  • keys

  Returns the Action names that are bound in this ActionMap.
  Returns:
  an array of the keys

  • size

  public int size()
  Returns the number of bindings in this ActionMap.
  Returns:
  the number of bindings in this ActionMap

  • allKeys

  public Object[] allKeys()
  Returns an array of the keys defined in this ActionMap and its parent. This method differs from keys() in that this method includes the keys defined in the parent.
  Returns:
  an array of the keys