java - 比较字符串和对象属性

Question

我尝试使用 .equals() 将字符串与对象属性进行比较，但即使条件为真，条件仍然失败。我尝试使用trim()来去掉尾随空格，但仍然失败。

这是我的代码:

if (status) {
        inventoryList = allInventory.getInventory();
        assert assetId != null;
        for (Inventory inventory : inventoryList) {
            if (assetId.trim().equals(inventory.getProductCode().trim())) {

                //get the current quantity that exists

                new_quantity.setValue(0);

                new_quantity.setMaxValue(inventory.getQuantity());
                inventoryId = inventory.getId();
                return;

            } else {
                // new_quantity.setVisibility(View.GONE);
                decrement.setEnabled(false);
                AlertDialog.Builder alert = new AlertDialog.Builder(this);
                alert.setTitle("Product not found ");
                // prevent cancel of AlertDialog on click of back button and outside touch
                alert.setCancelable(false);
                alert.setMessage("Product is not in inventory. Do you want to continue scanning?");

                alert.setNegativeButton("No", (dialog, which) -> {
                            onBackPressed();
                            dialog.dismiss();
                        }
                );
                alert.setPositiveButton("Yes", (dialog, which) -> {
                    Intent scanAsset = new Intent(this, ScanActivity.class);
                    scanAsset.putExtra("building", building);
                    scanAsset.putExtra("room", room);
                    scanAsset.putExtra("department", depart);
                    scanAsset.putExtra("TAG", "E");
                    startActivity(scanAsset);
                    dialog.dismiss();
                });
                AlertDialog dialog = alert.create();
                dialog.show();
            }

        }

Answer 1

我想向 oracle 文档指出:

Compares this string to the specified object. The result is true if and only if the argument is not null and is a String object that represents the same sequence of characters as this object.