RFR: 8375573: JTable ignores setPreferredWidth during initial layout when AUTO_RESIZE_LAST_COLUMN is enabled

[Tejesh R]

On Wed, 21 Jan 2026 06:11:50 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

>> src/java.desktop/share/classes/javax/swing/JTable.java line 3204:
>> 
>>> 3202:         // AUTO_RESIZE_LAST_COLUMN autoResizeMode
>>> 3203:         for (int i = 0; i < columnModel.getColumnCount(); i++) {
>>> 3204:             if (columnModel.getColumn(i).getPreferredWidth() != 75
>> 
>> Why are we using hardcoded value here ? Any particular reason for checking width against value `75` ?
>
> Because default width is such and there is no way to ascertain default width..
> https://github.com/openjdk/jdk/blob/b5727d27622e1e321733f8d0e606b366984104be/src/java.desktop/share/classes/javax/swing/table/TableColumn.java#L523-L524
> 
> https://github.com/openjdk/jdk/blob/b5727d27622e1e321733f8d0e606b366984104be/src/java.desktop/share/classes/javax/swing/table/TableColumn.java#L556-L557

Got it, it's been set here - https://github.com/openjdk/jdk/blob/b5727d27622e1e321733f8d0e606b366984104be/src/java.desktop/share/classes/javax/swing/table/TableColumn.java#L211

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PR Review Comment: https://git.openjdk.org/jdk/pull/29291#discussion_r2711169026