スレッドの起動停止を制御する

import java.util.*;

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

/**
$Id: threadcontroller.html,v 1.1 2009/06/22 16:12:30 kishi Exp kishi $
@author KISHI Yasuhiro
*/
public class DrawingController implements Runnable {

    private int i = 0;
    private boolean runningStatus;
    private JButton statusButton;

    public DrawingController( JButton statusButton ) {
        runningStatus = true;
        this.statusButton = statusButton;
    }

    public void run() {

        while ( runningStatus ) {
            i++;

            System.out.println( "i=" + i );
            statusButton.setText( new Integer( i ).toString() );

            try {
                Thread.sleep( 500 );
            } catch ( Exception exception ) {
                exception.printStackTrace();
            }
        }
    }

    public void setRunningStatus( boolean runningStatus ) {
        this.runningStatus = runningStatus;
    }

}
import java.util.*;

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

/**
<pre>
$Id: threadcontroller.html,v 1.1 2009/06/22 16:12:30 kishi Exp kishi $
Theadの開始・停止をコントロールする
</pre>
@author KISHI Yasuhiro 
*/

public class ThreadController extends JFrame implements ActionListener {
    JButton startButton = new JButton( "Start" );
    JButton stopButton = new JButton( "End" );
    JButton statusButton = new JButton( "STATUS" );

    JPanel northPanel;
    JPanel southPanel;
    DrawingController dc;

    Thread myThread;

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

    public ThreadController() {

        setTitle( "Theadの開始・停止をコントロールする" );
        setDefaultCloseOperation( EXIT_ON_CLOSE );

        northPanel = new JPanel();
        // 開始ボタンを追加
        northPanel.add( startButton );
        startButton.addActionListener( this );
        startButton.setActionCommand( "start" );

        // 終了ボタンを追加
        northPanel.add( stopButton );
        stopButton.addActionListener( this );
        stopButton.setActionCommand( "stop" );

        southPanel = new JPanel();
        southPanel.add( statusButton );

        Container container = getContentPane();
        container.add( northPanel, BorderLayout.NORTH );
        container.add( southPanel, BorderLayout.SOUTH );

        setBounds( 10, 10, 300, 600 );

        pack();

    }

    public void actionPerformed( ActionEvent e ) {
        String action = e.getActionCommand();

        if ( action.equals( "start" ) ) {

            if ( dc == null ) {
                statusButton.setText( "alive" );

                System.out.println( "開始されました！" );
                dc = new DrawingController( statusButton ); 

                myThread = new Thread( dc );
                // スレッド開始
                myThread.start();

            }
        }

        if ( action.equals( "stop" ) ) {

            if ( dc != null ) {
                System.out.println( "終了いたしました！" );

                // スレッドを停止させるためにステータスをfalseにする
                // Thread.stop()は推奨されないので使わない！
                dc.setRunningStatus( false );
                dc = null; // 明示的な開放

                statusButton.setText( "sleeping" );

            }

        }
    }

}