Java : how to get the expression through the jcombo list

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Java

How do i create the one line expression using Java swing, link image picture. the every minute, every day,every month, every weekday and every hour need to convert it to "*" and also all the combo box contain the list of number list number link and weekday contain the click the picture

what i want is, if the user select "Every Minute" , "Every day","month = 2", "Weekday = monday", "hour= 3"

note of weekday JCombo : sunday = 0 , monday = 1, tuesday = 2 .....



the output will print as : * * 2 1 3

thanks alot.

What I have tried:

String sjcb_EM = jcb_EM.getSelectedItem().toString();
String sjcb_EH = jcb_EH.getSelectedItem().toString();
String sjcb_ED = jcb_ED.getSelectedItem().toString();
String sjcb_EEM = jcb_EEM.getSelectedItem().toString();
String sjcb_EW = jcb_EW.getSelectedItem().toString();

String vb_1 = sjcb_EM + " " + sjcb_EH + " " + sjcb_ED + " " + sjcb_EEM + " " + sjcb_EW;