Only want one counter/timer, keep getting far more.

Question

My problem is that if a apply a new number to the counter/timer while it's still running, it adds a new counter along with the previous counter.
Is there a way of reseting the first counter to use the new chosen numbers.
I can cancel the old with a second button within the main timer method.
But I would like to cancel or reset from the select button.
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import javax.swing.DefaultListModel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.math.*;
import javax.swing.Timer.*;
public class CountDown3 extends JPanel
  JList list;
  DefaultListModel model;
  int counter = 1000;
  String time;
  final int SECONDS = 60;
  int minutes = 0;
  JButton btn2 = new JButton("end");
  public static void main(String s[])
      JFrame frame = new JFrame("List Model Example");
      frame.setContentPane(new CountDown3());
      frame.setSize(70, 80);
      frame.setVisible(true);
  public CountDown3()
    setLayout(new BorderLayout()); model = new DefaultListModel();
    list = new JList(model);JScrollPane pane = new JScrollPane(list);
    pane.setPreferredSize(new Dimension(100,22));
    JButton btn = new JButton("Min");
    for (int i = 1; i < 1000; i++)model.addElement(""+i);
    list.setSelectedIndex(0);add(pane, BorderLayout.NORTH);
    add(btn,BorderLayout.WEST);add(btn2,BorderLayout.EAST);
    btn.addActionListener(new ActionListener()
          public void actionPerformed(ActionEvent ae)
               int bob = list.getSelectedIndex();
               if(bob == JOptionPane.OK_OPTION);
                    String time = (String)list.getSelectedValue();
                   System.out.println(time);
                   ddd(time);
  public void ddd(String time)
     final java.util.Timer sid = new java.util.Timer(true);
     minutes = Integer.parseInt(time);
     sid.scheduleAtFixedRate(new TimerTask()
        int bbb = minutes * SECONDS;
        public void run()
               System.out.println(""+bbb/SECONDS+" : "+bbb % SECONDS);
                  bbb--;
             if(bbb < 0)
                       sid.cancel();
    },0,1000);
}

Answer 1

A little modification try this
Your program is good and superb
/* Try JSpinner instead of using JList with JScrollPane ... */
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.math.*;
import javax.swing.Timer.*;
public class CountDown3 extends JPanel{
  JList list;
  DefaultListModel model;
  int counter = 1000;
  String time;
  final int SECONDS = 60;
  int minutes = 0;
  JButton btn2 = new JButton("end");
  java.util.Timer sid=new java.util.Timer();
  public CountDown3(){
    setLayout(new BorderLayout());
    model = new DefaultListModel();
    list = new JList(model);
    JScrollPane pane = new JScrollPane(list);
    pane.setPreferredSize(new Dimension(100,22));
    JButton btn = new JButton("Min");
    for (int i = 1; i < 1000; i++)
        { model.addElement(""+i); }
    list.setSelectedIndex(0);
    add(pane, BorderLayout.NORTH);
    add(btn,BorderLayout.WEST);
    add(btn2,BorderLayout.EAST);
    btn.addActionListener(new ActionListener(){
          public void actionPerformed(ActionEvent ae)
               int bob = list.getSelectedIndex();
               if(bob == JOptionPane.OK_OPTION);
                   String time = (String)list.getSelectedValue();
                   System.out.println(time);
                   sid.cancel();
                   ddd(time);
  public void ddd(String time){
        sid= new java.util.Timer(true);
     minutes = Integer.parseInt(time);
     sid.scheduleAtFixedRate(new TimerTask(){
        int bbb = minutes * SECONDS;
        public void run(){
               System.out.println(""+bbb/SECONDS+" : "+bbb % SECONDS);
                  bbb--;
             if(bbb < 0)
                       sid.cancel();
    },0,1000);
  public static void main(String s[]){
      JFrame frame = new JFrame("List Model Example");
      frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
      frame.setContentPane(new CountDown3());
      frame.setSize(70, 80);
      frame.setVisible(true);
}