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134

answers:

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How can this be achieved? I have the ff. test code:

javax.swing.JOptionPane.showMessageDialog(null, "Hello, world!");

Running it with, say, -Duser.language=zh and -Duser.country=TW doesn't work. I.e., the OK button is still labeled "OK". In Windows, for example, it is replaced with the Traditional Chinese equivalent.

A: 

Prioritize the corresponding language in System Preferences > International.

Aqua is used if the LAF isn't specified. It doesn't respect the default locale probably because it's very much integrated into the OS.

If a cross-platform LAF is used (e.g., Metal), the problem is not observed.

Chry Cheng