Find Product and its Sub_product list through JComboBox Item State change.

 private void jComboBox2ItemStateChanged(java.awt.event.ItemEvent evt) {                                            
        String name1=jComboBox2.getSelectedItem().toString();
        String id=null;
        try
        {
    Class.forName("com.mysql.jdbc.Driver");
    java.sql.Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3305/inventory","root","root");
    String sql="select BRANDID from brand where BRANDNAME='"+name1+"'";
    java.sql.PreparedStatement pst=con.prepareStatement(sql);
    ResultSet rs=pst.executeQuery();
    while(rs.next())
    {
        id=rs.getString(1);
    }
    get(id);
        }
        catch(Exception e)
        {
            System.out.println(e);
        }
    }          

public void get(String id)
{
        DefaultComboBoxModel model = new DefaultComboBoxModel();  
     try
        {
    Class.forName("com.mysql.jdbc.Driver");
    java.sql.Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3305/inventory","root","root");
    String sql="select SUB_BRANDNAME from subbrand where BRANDID='"+id+"'";
    java.sql.PreparedStatement pst=con.prepareStatement(sql);
    ResultSet rs = pst.executeQuery(sql);
    while(rs.next())
    {
     String name=rs.getString(1);
     model.addElement(name);
    }
    jComboBox3.setModel(model); 
    con.close();
    pst.close();
        }
        catch(Exception e)
        {
            JOptionPane.showMessageDialog(null, e);
        }
     subbrand();
}

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