鼠标事件里参数怎么拿不到啊。

Question

请大神帮忙看看ArrayList q为什么在public MyJFrame（）方法里拿不到啊？？？

import java.awt.*;
import java.awt.event.*;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;

import javax.swing.*;

public class YeLunshuju {

public static void main(String[] args) throws IOException {
    MyJFrame mjf = new MyJFrame();
}

}
class MyJFrame extends JFrame{
ArrayList q = new ArrayList();
String[] a1;
JFrame jf= new JFrame();
JTextArea ja = new JTextArea();
FileDialog f;
JTextField j1 = new JTextField();
public MyJFrame() throws IOException{
JPanel p1 = new JPanel();
j1 = new JTextField(20);
JLabel l1 = new JLabel("选择数据所在位置:");
JButton b1 = new JButton("浏览");
MouL m = new MouL();
b1.addMouseListener(m);
p1.setLayout(new FlowLayout());
p1.add(l1);p1.add(j1);p1.add(b1);

   **System.out.println(q);**

    jf.add(p1,BorderLayout.NORTH);
    jf.setTitle("叶轮数据计算");
    jf.setBounds(300, 300, 500, 500);
    jf.setVisible(true);

}

class MouL extends MouseAdapter{


    public void mouseClicked(MouseEvent e) {
        try {
              ReadFile();

            } catch (IOException e1) {
                e1.printStackTrace();
        }
    }
    public void ReadFile( ) throws IOException{
        f = new FileDialog(jf," ",FileDialog.LOAD);
        f.setVisible(true);
        FileReader in = new FileReader(f.getDirectory()+f.getFile());
            BufferedReader bf = new BufferedReader(in);
        String line = bf.readLine();
        while(line != null){
             System.out.println(line);
             if(line.startsWith("X1=")){
                  String[] a = line.split("=");
                  a1 = a[1].split(",");

                  for(int i=0;i<a1.length;i++){
                         q.add(a1[i]);
                      } 

                 }
             if(line.startsWith("Y1=")){
                  String[] a = line.split("=");
                  a1 = a[1].split(",");
                for(int i=0;i<a1.length;i++){
                         q.add(a1[i]);
                      } 

             }
              line = bf.readLine();
        }
          j1.setText(f.getDirectory()+f.getFile()); 



}
}

}