try { Class.forName("com.mysql.jdbc.Driver"); java.sql.Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3305/supplimentry","root","root"); String sql="select * from inventory where Brand_Name='"+jComboBox3.getSelectedItem().toString()+"'"; java.sql.PreparedStatement pst=con.prepareStatement(sql); DefaultTableModel tm33 = (DefaultTableModel)list1.getModel(); tm33.setRowCount(0); TableColumn col = new TableColumn(tm33.getColumnCount()); JTableHeader header = list1.getTableHeader(); header.setBackground(Color.yellow); ResultSet rs = pst.executeQuery(sql); int i=0; while(rs.next()) { Vector v2 = new Vector(); v2.addElement(rs.getString(1)); v2.addEle...