import javax.swing.JComboBox;
import javax.swing.JFrame;
public class AddingItemToComboBox {
public static void main(String[] a) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JComboBox jComboBox1 = new JComboBox();
jComboBox1.addItem("asdf");
Object cmboitem = jComboBox1.getSelectedItem();
System.out.println(cmboitem);
frame.add(jComboBox1);
frame.setSize(300, 200);
frame.setVisible(true);
}
}