书上一个超市系统不会运行，大家告一下

象这样没有main方法如何运行？public class Earning extends JDialog {
    JPanel panel1 = new JPanel();  
    JLabel jLabel17 = new JLabel();
    public Earning(Frame owner, String title, boolean modal) {
        super(owner, title, modal);
        try {
            setDefaultCloseOperation(DISPOSE_ON_CLOSE);
            jbInit();
            pack();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }    public Earning() {
        this(new Frame(), "Earning", false);
        this.setSize(600,620);
    }    private void jbInit() throws Exception {
        panel1.setLayout(null);
        jLabel1.setFont(new java.awt.Font("宋体", Font.BOLD | Font.ITALIC, 25));
        jLabel1.setForeground(Color.red);
        colnames2.add(colnames1);
        jTable1 = Mytable.maketable(colnames2, colnames); //显示内容
        jScrollPane1.getViewport().add(jTable1);//把表装入容器
    }    public void jButton1_actionPerformed(ActionEvent e) {
        String str1=jComboBox1.getSelectedItem().toString()+"-"+jComboBox2.getSelectedItem().toString()+"-"+jComboBox3.getSelectedItem().toString();
        String str2=jComboBox4.getSelectedItem().toString()+"-"+jComboBox5.getSelectedItem().toString()+"-"+jComboBox6.getSelectedItem().toString();
        Vector vector=new Vector();//用来接收查询结果
        Vector vector2=new Vector();
       vector= SelectEarning.findAll(jTextField1.getText());//接收返回的结果
       if(vector.size()==0){
           JOptionPane.showMessageDialog(this, "没有商品的销售信息", "提示",
                                               JOptionPane.ERROR_MESSAGE);
           return;
       }
       double allMoney=0;//用于计算总金额
       int i=0;
       while(i<vector.size()){
           Vector vector1=new Vector();
           vector1=(Vector) vector.get(i);
           System.out.println(vector1.get(4).toString().substring(0,10));
           System.out.println(str1);
          System.out.println(SelectEarning.charbj(vector1.get(4).toString().substring(0,10),str1));
          System.out.println(SelectEarning.charbj(str2,vector1.get(4).toString().substring(0,10)));
          if(SelectEarning.charbj(vector1.get(4).toString().substring(0,10),str1) && SelectEarning.charbj(str2, vector1.get(4).toString())){
              Vector vector3=new Vector();
              int j=0;
             while(j<6){
                 vector3.add(vector1.get(j).toString());
                 j++;
                  }
                Double money=new Double(vector1.get(5).toString());
                allMoney+=money;
             vector2.add(vector3);
              }
          i++;
       }
       if(vector2.size()==0){
          JOptionPane.showMessageDialog(this, "没有商品的销售信息", "提示",
                                              JOptionPane.ERROR_MESSAGE);
          return;
      }       jLabel12.setText(str1);
       jLabel14.setText(str2);
       Double allMon =new Double(allMoney);
       jLabel16.setText(allMon.toString());
        jTable1 = Mytable.maketable(vector2, colnames); //显示内容
        jScrollPane1.getViewport().add(jTable1);//把表装入容器
    }
}
class Earning_jButton1_actionAdapter implements ActionListener {
    private Earning adaptee;
    Earning_jButton1_actionAdapter(Earning adaptee) {
        this.adaptee = adaptee;
    }    public void actionPerformed(ActionEvent e) {
        adaptee.jButton1_actionPerformed(e);
    }
}