试图通过检查数据库获得彩色按钮

Question

所以我试图在jpanel中获取一个按钮列表但是当我编译注意发生时 此按钮将根据time.getResult（）类的结果更改颜色 当它假设显示不同颜色的按钮时，框架显示为空 谢谢 每件事似乎没有错误，但注意到发生 这是代码

public t5() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 450, 300);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    contentPane.setLayout(new BorderLayout(0, 0));
    setContentPane(contentPane);

    JPanel panel = new JPanel();
    try
      {
        JButton[] label1 = new JButton[7];

            Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","");  
            String query="select * from employes";
            PreparedStatement pst=con.prepareStatement(query);
            ResultSet rs=pst.executeQuery();
            int i=0;
            while(rs.next())
            {   
                Timer time=new Timer(rs.getString("date_de_embauche").toString());
                int j=(int) time.getResulte();

                if(j<=0)
                {
                    label1[i] = new JButton(rs.getString("id")+" "+rs.getString("nom")+" "+rs.getString("prenom"));
                    label1[i].setForeground(Color.red);
                    label1[i].setPreferredSize(dim);
                    contentPane.add(panel);
                }

                if(j<=10 || j!=0)
                {
                    label1[i] = new JButton(rs.getString("id")+" "+rs.getString("nom")+" "+rs.getString("prenom"));
                    label1[i].setForeground(Color.orange);
                    label1[i].setPreferredSize(dim);
                    contentPane.add(panel);
                }

                if(j<=15 || j!=10)
                {
                    label1[i] = new JButton(rs.getString("id")+" "+rs.getString("nom")+" "+rs.getString("prenom"));
                    label1[i].setForeground(Color.yellow);
                    label1[i].setPreferredSize(dim);
                    contentPane.add(panel);
                }

                else
                {

                    label1[i] = new JButton(rs.getString("id")+" "+rs.getString("nom")+" "+rs.getString("prenom"));
                    label1[i].setForeground(Color.black);
                    label1[i].setPreferredSize(dim);
                    contentPane.add(panel);
                }

                i++;

                //System.out.println(rs.getString("nom")+"   "+rs.getString("prenom")+" "+time.getResulte());
                //System.out.println(rs.getString("date_de_embauche"));
            }

      }