On 8/21/2015 1:04 PM, Sergey Bylokhov wrote:
Hello.
Please review a small fix for jdk9.
Long long time ago the next request was filed for jdk 1.4.0:
"Today, there is no way for a program to access the UI of a
JComponent. Adding a getUI method would provide that capability and be
consistent with the fact that, for example, the JComponent's Border is
accessible"
It was evaluated and was closed:
"JComponent does not have a getUI so that each class can override it
to return the UI that is appropriate for the class, such as TreeUI or
TextUI..."
The problem was in absent of covariant returns, which were added to
the jdk 1.5. So now we can add the "ComponentUI getUI()" method to the
JComponent and in the same time we will have an ability to override it
using more specific return value in subclasses.
Could it break a binary compatibility if someone does not follow the
javadoc specification and has in his program getUI() method which return
type is not subclass of the ComponentUI?
Thanks,
Alexandr.
Bug: https://bugs.openjdk.java.net/browse/JDK-4339584
Webrev can be found at:
http://cr.openjdk.java.net/~serb/4339584/webrev.00
