试图阻止wav文件在第二个JButton Press上播放

Question

它可以找到.wav文件，但是当按下JButton时它不会播放文件。我最近在这里问了一个类似的问题，关于这个相同的代码以及它如何不会停止在第二个JButton印刷机上，而是创建一个新的音频实例。善良的人建议我将变量更改为实例字段，这是我很少有的经验。我试图改变它们，但我很可能做错了。这是我的代码：

import java.net.MalformedURLException;

import java.lang.NullPointerException;

import java.lang.IllegalArgumentException;

import javax.sound.sampled.AudioInputStream;

import javax.sound.sampled.AudioSystem;

import javax.sound.sampled.Clip;

import javax.sound.sampled.LineUnavailableException;

import javax.sound.sampled.UnsupportedAudioFileException;

import java.net.URL;

import javax.sound.sampled.*;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

import java.awt.*;

import javax.swing.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class aMeme extends JFrame implements ActionListener{

  public JButton button;

  public boolean check;

  public boolean audio;

  public static URL fg;

  public static AudioInputStream gram;

  public static Clip fitness;

  static{

    try{

      URL fg = new URL ("file:c:/Users/kebrobst18/Downloads/test.wav");

      Clip fitness = AudioSystem.getClip();

      AudioInputStream gram = AudioSystem.getAudioInputStream(fg);

    }

    catch (LineUnavailableException f){

    }

    catch (UnsupportedAudioFileException | IOException f) {

    }

  }

  public void paint(Graphics g){

    if (check == true){

      BufferedImage img = null;

      try{

        img = ImageIO.read(new File("C:/Users/kebrobst18/Downloads/Fitnessgram.png"));

      }

      catch (IOException e){

      }

      g.drawImage(img, 0, 0, this);

     }

  }

  public void start(){

    setLayout(new BorderLayout());

    button=new JButton();

    button.setPreferredSize(new Dimension(200, 100));

    button.setText("Start/Stop"); 

    button.addActionListener(this);

    add(button, BorderLayout.SOUTH);

    setSize(500,500);

    setVisible(true);

    audio = false;

  }       

  public void actionPerformed(ActionEvent e){    

    check = true;

    repaint();

    try{

      if (audio == false){

        fitness.open();

        fitness.start();

      }      

      else if (audio == true){

        fitness.stop();

        audio = false;

     }

    }

    catch (LineUnavailableException f){

    }

    catch(IllegalArgumentException f){

    }

    catch(NullPointerException f){

    }

  } 

  public static void main(String args[]){

    aMeme x = new aMeme();

    x.start();

  }

}