boolean b = true;

for (int i=0; i < noOfComboBoxes; i++) {
	if(jComboBox[i].getSelectedItem() == "")
	{
		b = false;
                break;
	}
}
                
if(b == false)
{
	OptionPane.showMessageDialog(this, "Complete the missing fields!", "Error", JOptionPane.ERROR_MESSAGE);
} else {
	saveMethod();
}