democomboboxframe.java

java绘图 java awt 经典绘图的例子,对于初学awt模块的人非常有帮助.

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package swing;

import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.JComboBox;
import javax.swing.JFrame;

/**
 *
 * @author zhaolin
 */
public class DemoComboboxFrame extends JFrame{
    public DemoComboboxFrame(){
        JComboBox jcb = new JComboBox();
        jcb.addItem("中国");
        jcb.addItem("美国");
        jcb.addItem("日本");
        jcb.addItemListener(new ItemListener(){

            public void itemStateChanged(ItemEvent e) {
                if(e.getStateChange() == ItemEvent.DESELECTED)
                    System.out.println(e.getItem()+" is Selected!");
            }
        
        });
        this.getContentPane().add(jcb);
        this.pack();
        this.setVisible(true);
        
    }
    
    public static void main(String[] args) {
        new DemoComboboxFrame();
    }

}