博为峰小博老师：
下面利用ComboBoxModel来创建一个下拉列表框实例，其代码如下所示:
public class BWF {
String[] s={"桃花","梅花","玫瑰","月季","茉莉","菊花"};
public BWF(){
JFrame jf=new JFrame("博为峰教育");
Container contentPane=jf.getContentPane();
ComboBoxModel<String> model=new UserDefineComboBoxModel();
JComboBox<String> combo=new JComboBox<String>(model);
combo.setBorder(BorderFactory.createTitledBorder("你最喜欢的花是那个？"));
contentPane.add(combo);
jf.pack();
jf.setVisible(true);
jf.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
public static void main(String[] args) {
new BWF();
}
class UserDefineComboBoxModel extends AbstractListModel<String> implements ComboBoxModel<String>{
String item=null;
public int getSize() {
// TODO Auto-generated method stub
return s.length;
}
public String getElementAt(int index) {
// TODO Auto-generated method stub
return s[index++];
}
public void setSelectedItem(Object anItem) {
item=(String)anItem;
}
public Object getSelectedItem() {
return item;
}
}
}
