java - JComboBox Selection Change -

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everyone quite new java gui, having issue jcombobox , firing when removeallitems combo box refresh it, issue because getting selected items details , populating textboxes them firing @ point getting null pointer. there simple(ish) way have method on combobox called when selected item changed not when combo box contents changed?

code

combobox current method

private void customercomboactionperformed(java.awt.event.actionevent evt) {                                                   setdetails();  }

method setting items in combo box

public void setcustomers() { customercombo.removeallitems(); (customer curr : main.getnewcustomerlist().getcustomers()) {      customercombo.additem(curr); } }

method setting details

public void setdetails() { customer selected = (customer) customercombo.getselecteditem(); forenametext.settext(selected.getforename()); surnametext.settext(selected.getsurname()); costperkgtext.settext(string.valueof(selected.getdeliverycost())); line1text.settext(string.valueof(selected.getcoladdress().getaddressline1())); line2text.settext(string.valueof(selected.getcoladdress().getaddressline2())); citytext.settext(string.valueof(selected.getcoladdress().getcity())); postcodetext.settext(string.valueof(selected.getcoladdress().getpostcode()));  }

you not accounting case there no selection.

public void setdetails() {     customer selected = (customer) customercombo.getselecteditem();     if (selected != null)     {         // there selection use     }     else     {         // example, clear text boxes     } }

we expect changing contents of combo box might change selection shouldn't ignore it.


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