Open and Save buttons are default buttons in JFileChooser dialog, therefore mnemonics are redundant.

Mnemonics in JFileChooser were removed in Metal Look-and-Feel under JDK-7174970.
Further, mnemonics were removed with the fix for JDK-8042835 from Asian locales (ja, ko, zh_CN, zh_TW) but then they were re-added by JDK-8059177.

Steps to reproduce:

1. Run SwingSet2: java -jar SwingSet2.jar
2. Open JFileChooser demo, the fifth icon.
3. Click Show Plain JFileChooser button. The should be no mnemonic on Open button in both cases where a file is selected and where a directory is selected.

The test applies to all Look-and-Feels. In Windows LaF, you need to press and hold Alt button to see mnemonics.

To change locale, pass -Duser.language possibly with -Duser.country. For example,

java -Duser.language=es -jar SwingSet2.jar
java -Duser.language=zh -Duser.country=CN -jar SwingSet2.jar

Will launch SwingSet2 with Spanish and Chinese (China) UI language correspondingly. SwingSet is not localized but JFileChooser is.


Alternatively, run the attached FileChooserMnemonics.java to get the list of mnemonic keys in different locales and Look-and-Feels. If there are no mnemonics, you'll see only the list of Look-and-Feels and locales that were tested – it is the expected result. If you see any key, for example "FileChooser.directoryOpenButtonMnemonic = 79" then localization resources need updating.