RFR: 8328238: Convert few closed manual applet tests to main [v4]

[Alexey Ivanov]

On Thu, 21 Mar 2024 03:13:45 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

>> test/jdk/javax/swing/JFrame/bug4419914.java line 71:
>> 
>>> 69:         frame.enableInputMethods(false);
>>> 70:         frame.getContentPane().setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
>>> 71:         frame.getContentPane().setLocale(Locale.ENGLISH);
>> 
>> The requirement to use getContentPane() has been obsolete since JDK 1.5 ...
>> here's an external page about it https://coderanch.com/t/345686/java/getContentPane
>> But I don't generally tell people to delete except here there are 9 calls cluttering up this code.
>> So not critical, but a suggestion.
>
> Thanks for the information, didn't know that..Updated....there is around ~400 occurrence of getContentPane() in swing tests in open still so probably something to be optimised in future...

The tests were probably written before Java 5, even tests written later could still use `getContentPane` so that the test could be run with previous versions of Java. Yet it's irrelevant now.

The Java Tutorials have never been updated, [How to Make Frames](https://docs.oracle.com/javase/tutorial/uiswing/components/frame.html) uses `getContentPane` explicitly.

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/18390#discussion_r1533657135