我正在将类的对象添加到List中,出现错误
“ System.err:java.lang.NullPointerException:尝试调用 接口方法'boolean java.util.List.add(java.lang.Object)' 空对象引用”
List<udjc_ET_Purchasedirect> udoTempListPurchase;
udjc_ET_Purchasedirect udoTempPurchaseDir = new udjc_ET_Purchasedirect();
udoTempPurchaseDir.setbarcode(udo_barcode.getText().toString());
udoTempPurchaseDir.setreference(udo_invrefference.getText().toString());
udoTempPurchaseDir.setsuppliercode(udoDataBaseSupplier.udfGetSelectedsuppliercode(udo_SPN_supplier.getSelectedItem().toString()));
udoTempPurchaseDir.setddtrans("29-05-2019");
udoTempPurchaseDir.setlinecount(udoSize);
udoTempPurchaseDir.setqty(Double.parseDouble(udo_qtyin.getText().toString()));
udoTempPurchaseDir.setqty_out(Double.parseDouble(udo_qtyout.getText().toString()));
udoTempPurchaseDir.setindtype(isCheckedCredit);
udoTempListPurchase.add(udoTempPurchaseDir);