Return TextField makes BING in AWT

Question

Why does a return inside a TextField in Java AWT make a bing sound in dialogs? I have an old AWT program here, and run it under Java 7. It does not seem to matter, if the TextField has an action listener or not.

Update: I tried to isolate the problem writing another application with a dialog, but there is no beep. I also noticed that cursor up and down work in one program and in the other they cause a bing. However, there is no obvious code which is called to handle keystrokes.

Update: I also discovered that the right mouse button does not work in the beeping application.

Thanks for answers and help.

Answer 1

Perhaps it is using Toolkit.getDefaultToolkit().beep(); to indicate you pressed return when no text is present or for other validation reasons?

This may be invoked via the look-and-feel. Is this application loading some custom look-and-feel? If so, try disabling it and see if the behavior goes away.

Answer 2

我发现了问题：它是Java7。在Java 6中一切正常。这是Oracle的工作，可能对此我们无能为力。