Why it shows errors at swing components

Question

I am new to JFrame. I just started learning about creating a Java project. I created an input field as a date and inserted a DateChooseCombo. I have 2 problems.

1. When I run the application dates in the calendar are invisible but, it shows the date which is selected in the box.
2. When I submit the form it gives an error as "Cannot format given Object as a Date"

The code for the date is as follows:

SimpleDateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy");
String addDate = dateFormat.format(txt_AddDate.getSelectedDate());
ps.setString(3 ,addDate);

The date format used is 04/30/2021.

Can anyone help me to solve these two problems?

Answer 1

Method getSelectedDate(), in class datechooser.beans.DateChooserCombo, returns a java.util.Calendar.

Method format, in class java.text.DateFormat (which is superclass of java.text.SimpleDateFormat and hence inherited by SimpleDateformat) requires a parameter of type java.util.Date. A Calendar is not a Date and that's why you are getting the error. Java cannot convert a Calendar to a Date.

However, class Calendar has method getTime which returns a Date.
So you need to change the second line of the code, that you posted in your question, to the following.

String addDate = dateFormat.format(txt_AddDate.getSelectedDate().getTime());

You can also refer to the following question (and answer) :
Can't get date from DateChooserCombo