For menus
For menus.
A method that should be called from every well-designed equals method that is open to be overridden in a subclass
For all components
For all components.
This method is used to compare the receiver object (this
)
with the argument object (arg0
) for equivalence
This method is used to compare the receiver object (this
)
with the argument object (arg0
) for equivalence.
The default implementations of this method is an equivalence relation:
x
of type Any
,
x.equals(x)
should return true
.x
and y
of type
Any
, x.equals(y)
should return true
if and only
if y.equals(x)
returns true
.x
, y
, and z
of type AnyRef
if x.equals(y)
returns true
and
y.equals(z)
returns
true
, then x.equals(z)
should return true
.
If you override this method, you should verify that
your implementation remains an equivalence relation.
Additionally, when overriding this method it is often necessary to
override hashCode
to ensure that objects that are
"equal" (o1.equals(o2)
returns true
)
hash to the same Int
(o1.hashCode.equals(o2.hashCode)
).
the object to compare against this object for equality.
true
if the receiver object is equivalent to the argument; false
otherwise.
Returns a hash code value for the object
Returns a hash code value for the object.
The default hashing algorithm is platform dependent.
Note that it is allowed for two objects to have identical hash
codes (o1.hashCode.equals(o2.hashCode)
) yet not be
equal (o1.equals(o2)
returns false
). A
degenerate implementation could always return 0
.
However, it is required that if two objects are equal
(o1.equals(o2)
returns true
) that they
have identical hash codes
(o1.hashCode.equals(o2.hashCode)
). Therefore, when
overriding this method, be sure to verify that the behavior is
consistent with the equals
method.
None if large icon and small icon are not equal
None if large icon and small icon are not equal.
Can be used for status bars, for example
Can be used for status bars, for example.
Default: java
Default: java.awt.event.KeyEvent.VK_UNDEFINED, i.e., no mnemonic key. For all buttons and thus menu items.
return k for a product A(x_1,
for a product A(x_1,
An iterator that returns all fields of this product
An iterator that returns all fields of this product
By default the empty string
Title is not optional
Title is not optional.
For all components
For all components.
Special action that has an empty title and all default properties and does nothing. Use this as a "null action", i.e., to tell components that they do not have any associated action. A component may then obtain its properties from its direct members instead of from its action. In Java Swing, one would use
null
instead of a designated action.