Java create table in database and add fields to it

import java.awt.*;
import java.sql.*;
import java.util.*;
import javax.swing.*;
import java.awt.event.*;
class CreateTable
{
    public static void main(String[] args) 
    {
        JFrame f=new JFrame();
        JLabel lab=new JLabel("Enter Table name: ");
        final JTextField text=new JTextField(20);
        JButton b=new JButton("Create");
        f.setLayout(null);
        lab.setBounds(10,10,150,20);
        text.setBounds(180,10,150,20);
        b.setBounds(180,40,100,20);
        b.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
            String st=text.getText();
            String num=JOptionPane.showInputDialog(null, "How many fields do you want to add in table "+st); 
            int no=Integer.parseInt(num);
            String field[]=new String[no];
            String type[]=new String[no];
            for(int i=0;i<no;i++){
                field[i]=JOptionPane.showInputDialog(null,"Enter field "+i);
                type[i]=JOptionPane.showInputDialog(null,"Enter its datatype");
            }
            try{
            Class.forName("com.mysql.jdbc.Driver");
            Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");
            Statement stmt=con.createStatement();
             String table = "CREATE TABLE "+st+"(id integer)";
            stmt.executeUpdate(table);
            stmt.close();
            Statement sta=con.createStatement();
            for(int i=0;i<no;i++){
            System.out.println(field[i]+" "+type[i]);
            sta.executeUpdate("ALTER TABLE "+st+" ADD "+field[i]+" "+type[i]);
            }
            JOptionPane.showMessageDialog(null, "Table is created successfully");
            }
            catch(Exception ex){
            System.out.println(ex);
            }
            }
        });
        f.add(lab);
        f.add(text);
        f.add(b);
        f.setVisible(true);
        f.setSize(350,100);
    }
}