?? ch9_18.java
字號(hào):
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class ch9_18 extends JFrame
{
public ch9_18()
{
super("測(cè)試下拉列表框");
setBounds(20,20,600,400);
getContentPane().setLayout(null);
}
public static void main(String [] args)
{
ch9_18 f=new ch9_18();
ComboBoxModel mode = new UserDefineComboBoxModel();
JComboBox jcb=new JComboBox(mode);
jcb.setBorder(BorderFactory.createTitledBorder("列表"));
jcb.setBounds(20,20,80,50);
f.getContentPane().add(jcb);
f.show();
}
}
class UserDefineComboBoxModel extends AbstractListModel implements ComboBoxModel
{
String item=null;
String [] s={"美國(guó)","中國(guó)","俄羅斯","日本","巴西","韓國(guó)"};
public Object getElementAt(int index)
{
return s[index++];
}
public int getSize()
{
return s.length;
}
public void setSelectedItem(Object anItem)
{
item=(String)anItem;
}
public Object getSelectedItem()
{
return item;
}
}
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