編集可能なJComboBox

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

/**
$Id: JComboBox.html,v 1.1 2009/06/22 16:11:47 kishi Exp kishi $
*/

public class ComboBoxTest extends JFrame implements ActionListener {

    private JComboBox combo;
    private JButton button;
    private final String listItem[] =
        { "新宿", "代々木", "原宿", "渋谷", "恵比寿", "目黒", "五反田", "大崎", "品川", "田町" };

    public ComboBoxTest() {
        super( "ComboBoxTest" );
        setDefaultCloseOperation( EXIT_ON_CLOSE );

        combo = new JComboBox( listItem );
        combo.setEditable( true );
        getContentPane().add( combo );

        button = new JButton( "実行" );
        button.addActionListener( this );
        getContentPane().add( button, BorderLayout.SOUTH );

        pack();
    }

    public void actionPerformed( ActionEvent e ) {
        String selectedString = ( String ) combo.getSelectedItem();

        System.out.println( "--- 以下の駅名が選択されました！ ---" );
        System.out.println( selectedString );
        for ( int i = 0; i < combo.getItemCount(); i++ ) {
            if ( selectedString.equals( combo.getItemAt( i ) ) ) {
                return ;
            }
        }
        combo.addItem( selectedString );
    }

    public static void main( String args[] ) {
        new ComboBoxTest().setVisible( true );
    }

}