String cannot be cast to java error: Trying to convert string into integer

When trying to add years from a combobox this error
shows:

Exception in thread "AWT-EventQueue-0"
java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer

at
LibraryFrame$addListener.actionPerformed(LibraryFrame.java:103)

The
program highlights the 'Integer anInteger = (Integer) selected;' line as the problem?

class addListener implements
            ActionListener
{

 public void actionPerformed(ActionEvent
            e)
 {
 Object selected = yearCombo.getSelectedItem();
            

 if(e.getSource() == button)
 {

            System.out.println("Add button clicked!");
 String t =
            title.getText();
 Integer anInteger = (Integer) selected;
 int y =
            anInteger;

 int q =
            Integer.parseInt(quantity.getText());
 library.addItem(new
            LibraryItem(t,y,q));
 library.printLibrary();


            System.out.println("Thank You!");
 }

            }
}

Heres
the code where yearCombo is
populated:

label1 = new
            JLabel("Year");
 yearCombo = new JComboBox();

            ArrayList countYear = new ArrayList();
 for(int
            y=1800; y<=2014; y++)
 {
 countYear.add(y);

            }
 for(int x=0; x < countYear.size(); x++)


            {
 yearCombo.addItem((countYear.get(x) + " ")); 

 }
            

CODE NOW THROWING A
NUMBER FORMAT EXCEPTION after
changing

 Integer anInteger =
            (Integer)
            selected;

to

            Integer anInteger =
            Integer.parseInt(selected.toString());

Answer

This:

yearCombo.addItem((countYear.get(x)
            + " "));
// ^--------------- not
            numeric

results
in a string that cannot be converted to a number, no matter what
countYear.get(x) gives
you.

Do you really need to add that space
there?