import javax.swing.*;
import java.awt.BorderLayout;
import java.util.Vector;

public class JComboBoxTest3 extends JFrame{

  public static void main(String[] args){
    JComboBoxTest3 frame = new JComboBoxTest3();

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBounds(10, 10, 300, 200);
    frame.setTitle("ƒ^ƒCƒgƒ‹");
    frame.setVisible(true);
  }

  JComboBoxTest3(){
    Vector<String> combodata = new Vector<String>();
    combodata.add("Swing");
    combodata.add("Java2D");
    combodata.add("Java3D");
    combodata.add("JavaMail");

    JComboBox combo = new JComboBox(combodata);

    JPanel p = new JPanel();
    p.add(combo);

    getContentPane().add(p, BorderLayout.CENTER);
  }