How do I add data from adatabase using jcomboboxes to a jtable using a a jbutton

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Java

hi
I am having a casting error this is the error....Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: class java.lang.String cannot be cast to class java.lang.Integer (java.lang.String and java.lang.Integer are in module java.base of loader 'bootstrap')

here is the method i am using

empID=(int)employees[selectedIndex-1][1];

 public void updateTable()
    {
         int selectedIndex=employeeCmb.getSelectedIndex();
         int empID;
         if (selectedIndex==0)
            empID =-1;
         else
            empID=(int)employees[selectedIndex-1][1];


         String adate=dateLbl.getText();
         
         q.connectToDatabase();
         empAppointments=q.getEmpAppointments_OA(empID,adate);
         int appCount=empAppointments.length;
         
         Object [][]empAppointments2 = new Object[appCount][4];
         for (int i =0; i < appCount; i++)
         {
             for (int j=0; j < 4;j++)
             {
                 empAppointments2[i][j]=empAppointments[i][j];
                 model=new DefaultTableModel(empAppointments2,colNames);
                 table.setModel(model);
                 q.disconnectFromDatabase(); 
          //       System.out.println(colNames);
             }
         }
    }
       
       
    public void actionPerformed(ActionEvent e)
    {
        if(e.getSource()==insBtn)
         {
              updateTable();
             
        }
        else if (e.getSource()==nextBtn)
        {
           l=l+86400000;
           d=new Date(l);
           s=sdf.format(d);
           dateLbl.setText(s);            
        }
            
        else if (e.getSource()==preBtn)
        {
            l=l-86400000;
            d=new Date(l);
            s=sdf.format(d);
            dateLbl.setText(s);  
        }
        
        else if (e.getSource()==delBtn)
        {
        int deleted=q.deleteOneClient(4);
        
        
        
        }
        
        else if(e.getSource()==updBtn)
        {
       int inserted=q.insertOneClient("ali","rahim","123 Some Rd","ddd@eee","3456777");
        
        
        }
    }

    public static void main(String[] args)
    {
       Queries q = new Queries();
       new BookingCard();
    }


}

What I have tried:

empID=(int)employees[selectedIndex-1][1];

this is where bluej shows as the error