字符串不能强制转换为Java错误：尝试将字符串转换为整数

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

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尝试从组合框添加年份时，此错误显示：

线程"awt-eventqueue-0"java.lang.ClassCastException中出现异常：java.lang.string不能强制转换为java.lang.integer

在ActualFrase$AdListNeal.ActActudio(LabyFrask.java：103)

程序突出显示"整数整型=(integer)selected；"行作为问题？

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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!");
}
}
}

下面是填充YearCombo的代码：

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label1 = new JLabel("Year");
yearCombo = new JComboBox();
ArrayList<Integer> countYear = new ArrayList<Integer>();
for(int y=1800; y<=2014; y++)
{
countYear.add(y);
}
for(int x=0; x < countYear.size(); x++)
{
yearCombo.addItem((countYear.get(x) +""));

}

代码现在在更改后引发数字格式异常

1	Integer anInteger = (Integer) selected;

到

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