What are effective Swing GUI widgets for choosing dates in Java?

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There are a few effective Swing GUI widgets for choosing dates in Java, including:

1. JCalendar: This is a popular and well-known date picker widget that allows users to select a date from a calendar view.

2. JXDatePicker: This is another popular date picker that includes a calendar view and also allows users to enter dates manually.

3. JDateChooser: This is a third-party date picker widget that can be easily integrated into Swing applications. It includes a large calendar view and also allows users to enter dates manually.

4. DateTimePicker: This is a comprehensive date and time picker widget that includes options for selecting time zones and specifying dates to the second.

5. SpinDateField: This widget allows users to select a date using spinners for day, month, and year, which can be a more intuitive option for some users.