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.
Called before the GUI is created
Called before the GUI is created. Override to customize.
Calls top, packs the frame, and displays it
Calls top, packs the frame, and displays it.
Initializes the framework and runs the given program
Initializes the framework and runs the given program.
Returns a string representation of the object
Returns a string representation of the object.
The default representation is platform dependent.
A GUI application's version of the main method
A GUI application's version of the main method. Called by the default main method implementation provided by this class. Implement to return the top-level frame of this application.
Extend this class for most simple UI applications. Clients need to implement the
top
method. Framework intialization is done by this class.In order to conform to Swing's threading policy, never implement top or any additional member that created Swing components as a value unless component creation happens on the EDT (see Swing.onEDT and Swing.onEDTWait). Lazy values are okay for the same reason if they are intialized on the EDT always.