The ActionListeners here are not running concurrently... import java.io.*;
import javax.swing.*; import java.awt.event.*; import javazoom.jl.player.Player;
import java.io.FileInputStream;

    public class Play2 extends JFrame
    {  
    JButton b,b1;
    JTextField t;

    Play2()
    {
        JFrame j=new JFrame("MusicPlayer");
        j.setSize(300,300);
        j.setDefaultCloseOperation(EXIT_ON_CLOSE);
        b=new JButton("Play");
        b1=new JButton("Stop");
        JPanel p=new JPanel();
        t=new JTextField(20);
        p.add(t);
        p.add(b);
        p.add(b1);
        j.add(p);
        /**try {
            j.setContentPane(new JLabel(new ImageIcon(ImageIO.read(new File("jesus.jpg")))));
            } 
        catch (IOException e) {
            e.printStackTrace();
            }
        j.getContentPane().setOpaque(false);*/
        j.setVisible(true);


    }
    public void awt()
    {
    b.addActionListener(
            new ActionListener(){
                  public void actionPerformed(ActionEvent ae){
                try  
                    {  

            String fname=t.getText();
            File directory = new File(fname);

            boolean isDirectory = directory.isDirectory();

            if (isDirectory) 
             {
                    // It returns true if directory is a directory.
                System.out.println("the name you have entered is a directory  : "  +  directory);  
                    //It returns the absolutepath of a directory.
                    System.out.println("the path is "  +  directory.getAbsolutePath());
             }
            else
            {
                    // It returns false if directory is a file.
                System.out.println("the name you have entered is a file  : " + directory);
                    //It returns the absolute path of a file.
                    System.out.println("the path is "  + directory.getAbsolutePath());
            }
                String s=directory.getAbsolutePath();

                s=s.replace("\\","/") ;

                    FileInputStream fis=new FileInputStream(s);  
                    final Player playMp3=new Player(fis);  

                    playMp3.play(); 
        }
        catch(Exception e){
            System.out.println(e);}
        }//end actionPerformed
      }//end ActionListener
    );//end addActionListener()

    b1.addActionListener(
      new ActionListener(){
        public void actionPerformed(
                                  ActionEvent ae){
          //Terminate playback before EOF
                    try  
                    {  

            String fname=t.getText();
            File directory = new File(fname);

            boolean isDirectory = directory.isDirectory();

            if (isDirectory) 
             {
                    // It returns true if directory is a directory.
                System.out.println("the name you have entered is a directory  : "  +  directory);  
                    //It returns the absolutepath of a directory.
                    System.out.println("the path is "  +  directory.getAbsolutePath());
             }
            else
            {
                    // It returns false if directory is a file.
                System.out.println("the name you have entered is a file  : " + directory);
                    //It returns the absolute path of a file.
                    System.out.println("the path is "  + directory.getAbsolutePath());
            }
                String s=directory.getAbsolutePath();

                s=s.replace("\\","/") ;

                    FileInputStream fis=new FileInputStream(s);  
                    final Player playMp3=new Player(fis);  

                    playMp3.close(); 
        }
        catch(Exception e){
            System.out.println(e);}
        }//end actionPerformed
      }//end ActionListener
    );//end addActionListener()

    }


        public static void main(String[]args)  
        {  
        Play2 f=new Play2();
        f.awt();    
    }

}