private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
    try
{
    Class.forName("com.mysql.jdbc.Driver");
    con=DriverManager.getConnection("jdbc:mysql://localhost/company","root","redhat");
    stmt=con.createStatement();
    String nm=jTextField1.getText();
    char[] pass=jPasswordField1.getPassword();
    String pw=Arrays.toString(pass);
    String sql="select * from login where uname='"+nm+"' and pass='"+pw+"'";
    rs=stmt.executeQuery(sql);
    if(rs.next())
     {
      new MainPage().setVisible(true);
      this.setVisible(false);
     }
    else
     {
      JOptionPane.showMessageDialog(this, "Wrong User name or password");
      jTextField1.setText("");
      jPasswordField1.setText("");

     }
}
catch(Exception e)
{
  System.out.println(e);
}
}              `