Write a java program to design a screen with two buttons start thread and stop thread.

import java.awt.*;

import java.awt.event.*;

class NewThread implements Runnable

  {

                Thread t;

                boolean flag=true;

                       public void run()

                                   {

                                                while(flag)

                                                  {

                                                      System.out.println("Thread is Running..");

                                                   }

                                    }

                                void startThread()

                                  {

                                                t=new Thread(this);

                                                t.start();

                                   }

                                void stopThread()

                                  {

                                                flag=false;

                                   }

  }

class strtstop extends Frame implements ActionListener

  {

                Button b1=new Button("START");

                Button b2 =new Button("STOP");

    NewThread t1;

                strtstop()

                {

                                 setTitle("Implementing Thread start and stop");

                     setSize(250,200);

                     setLayout(new FlowLayout());

                     b1.setVisible(true);

                     add(b1);

                     b1.addActionListener(this);

                     b2.setVisible(true);

                     add(b2);

                     b2.addActionListener(this);

                     this.addWindowListener(new WindowAdapter(){

                                public void windowClosing(WindowEvent we)

                                {

                                                t1.stopThread();

                                                 dispose();

                                }

                     });

                     b2.setEnabled(false);

                     setVisible(true);

                    

                }

                public void actionPerformed(ActionEvent ae)

                {

                   try

                     {

                                if(ae.getSource()==b1)

                                   {

                   t1=new NewThread();

                                           t1.startThread();

                                           b1.setEnabled(false);

                                           b2.setEnabled(true);

                                    }

                                if(ae.getSource()==b2)

                                   {

                                                t1.stopThread();

                                                b1.setEnabled(true);

                                                b2.setEnabled(false);

                                    }

                      }catch(Exception e)

                                 {}

                }

      public static void main(String ar[])

                {

                                strtstop ss=new strtstop();

                }

   }