博为峰Java技术文章 ——JavaSE Swing使用ComboBoxModel创建下拉列表框Ⅱ

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;

}

}

}