Java 在不同的时间多次向TableView添加相同的对象
我正试图建立一个购物项目。该程序可以将所有添加的产品保存在SQLite数据库中，而不会出现任何问题 有一些限制 产品可以是主产品或标准产品。主要产品有自己的子产品。如果客户想要购买主产品，那么客户也必须购买其子产品 到目前为止，一切似乎都很好。在主屏幕上，我在顶部构建了2个tableview，用户可以看到所有产品的列表（tableProductsInfo），在桌子下面，您可以看到购物车桌子（tableShoppingBasket） 如果用户从tableProductsInfo中选择一个产品并单击“添加到购物车”按钮，该产品将添加到下面的购物篮（observableList）中，如图所示 这里是我的“添加到购物车”按钮代码Java 在不同的时间多次向TableView添加相同的对象,java,javafx,tableview,javafx-8,Java,Javafx,Tableview,Javafx 8,我正试图建立一个购物项目。该程序可以将所有添加的产品保存在SQLite数据库中，而不会出现任何问题 有一些限制 产品可以是主产品或标准产品。主要产品有自己的子产品。如果客户想要购买主产品，那么客户也必须购买其子产品 到目前为止，一切似乎都很好。在主屏幕上，我在顶部构建了2个tableview，用户可以看到所有产品的列表（tableProductsInfo），在桌子下面，您可以看到购物车桌子（tableShoppingBasket） 如果用户从tableProductsInfo中选择一个产品并单击
@FXML
public void addtoShoppingBasket() throws IOException {
if(tableProductInfo.getSelectionModel().getSelectedItem()!=null){ // eğer bir ürün seçiliyse // if any product selected?
Product selectedItem = (Product) tableProductInfo.getSelectionModel().getSelectedItem(); //
int inputQuantity = getInputDialogPane(); // Kaç tane ürün eklenmek istiyor? // how many products user wants to buy?
if(selectedItem.getStock()>=inputQuantity){ // STOK KONTROL eğer eklenmek istenen ürün stokta varsa // Checking stock if its avaliable for selling
selectedItem.setQuantity(inputQuantity);
//main ürün şuan alınabilir durumda (sub ürünü varsa henüz değil)
if (selectedItem.getSubProduct()==1){ // eğer sub ürünü varsa // if selected product has subProducts
//that means its main product and we need to check its sub products
//1)sub ürün listesini al, // get all subProducts of selectedItem
//2) sub ürün stok kontrollerini yap main.Quantity*sub.Quantity <= Sub.stock // check its stock
//3) eğer stokta varsa tabloya ekle yoksa uyarı ver // if any of subitems out of stock capasity then don't let user to buy the main product and its subProducts
ProductDialogPaneController productDialogPaneController = new ProductDialogPaneController();
ObservableList returnedList =FXCollections.observableArrayList();
returnedList=productDialogPaneController.getSubProducts(selectedItem.getProductID()); // getting all subproducts of main Product
Iterator<Product> productIterator = returnedList.iterator();
boolean inStock=true;
while (productIterator.hasNext()){
Product currentSubProduct = productIterator.next();
if((currentSubProduct.getQuantity()*selectedItem.getQuantity())>currentSubProduct.getStock()){
//eğer eklenmek istenen alt ürünün tanımlanan Miktarı*Alınmak istenen Main ürünün miktarı stok kapasitesinden fazla değilse
//sub products should multiply with main product quantity
inStock=false;
}
}
if(inStock==true){
System.out.println("in stock true");
// there is no stock problem for any sub product
//here we need to check if shoppingBasket contains selected item or its sub products
//if it contains then update/change its quantity
//else then add selected item and its subProducts into shoppingBasket
shoppingBasket.add(selectedItem);
shoppingBasket.addAll(returnedList);
}else{
System.out.println("ALMAK İSTEDİĞİNİZ MAİN ÜRÜNLE BİRLİKTE ALINMASI GEREKEN ALT ÜRÜNLERDEN BİRİ VEYA BİRKAÇI STOKTA YOK!");
}
}else{ //eğer sub ürünü yoksa (selectedItem.getSubProduct==0)
//if it's not the main product in another words if its standard Product
shoppingBasket.add(selectedItem);
}
}else{
System.out.println("ALMAK İSTEDİĞİNİZ MAİN ÜRÜN STOKTA YETERİ KADAR YOK");
//the product you wanted to buy is out of stock capacity
}
}else{ // eğer ürün listesinden bir ürün seçilmediyse
System.out.println("ALIŞ VERİŞ SEPETİNE EKLENECEK ÜRÜNÜ SEÇMEDİNİZ !");
//no item selected to buy
}
}
- 主产品200 2
- 子产品X 10 2
- 次级产品50 2
//checking for MAIN PRODUCT
if(shoppingBasket.contains(selectedItem)){
int index= shoppingBasket.indexOf(selectedItem);
Product existingItem=shoppingBasket.get(index);
shoppingBasket.remove(selectedItem); //removing old item
existingItem.setQuantity(existingItem.getQuantity()+inputQuantity);
shoppingBasket.add(index,existingItem); // adding updated item
}else{
shoppingBasket.add(selectedItem); // if if its adding first time
}
//Checking for Sub Products
Iterator subItemIterator=returnedList.iterator();
while (subItemIterator.hasNext()){
Product newSubItem = (Product) subItemIterator.next();
Iterator ShoppingIterator = shoppingBasket.iterator();
if(shoppingBasket!=null && !shoppingBasket.isEmpty()){
while (ShoppingIterator.hasNext()){
Product oldSubItem= (Product) ShoppingIterator.next();
if(oldSubItem.getProductID()==newSubItem.getProductID()){
oldSubItem.setQuantity(newSubItem.getQuantity()+oldSubItem.getQuantity());
}else{
shoppingBasket.add(newSubItem);
}
}
} else {shoppingBasket.add(newSubItem);
}
}
我刚刚解决了我的问题。我发现了一些错误，如果你愿意，你可以找到我的运行代码 我最大的错误之一
shoppingBasket.contains(selectedItem);
if(tableProductInfo.getSelectionModel().getSelectedItem()!=null){ // eğer bir ürün seçiliyse // if any product selected?
Product selectedItem = (Product) tableProductInfo.getSelectionModel().getSelectedItem(); //
int inputQuantity = getInputDialogPane(); // Kaç tane ürün eklenmek istiyor? // how many products user wants to buy?
int totalQ=returnTotalQuantity(selectedItem); // if this item added already in the shopping basket we are subsraction added quantity
if(selectedItem.getStock()-totalQ>=inputQuantity){ // STOK KONTROL eğer eklenmek istenen ürün stokta varsa // Checking stock if its avaliable for selling
//selectedItem.setQuantity(inputQuantity);
if (selectedItem.getSubProduct()==1){ // eğer sub ürünü varsa // if selected product has subProducts
//that means its main product and we need to check its sub products
//1)sub ürün listesini al, // get all subProducts of selectedItem
//2) sub ürün stok kontrollerini yap main.Quantity*sub.Quantity <= Sub.stock // check its stock
//3) eğer stokta varsa tabloya ekle yoksa uyarı ver // if any of subitems out of stock capasity then don't let user to buy the main product and its subProducts
ProductDialogPaneController productDialogPaneController = new ProductDialogPaneController();
ObservableList returnedList =FXCollections.observableArrayList();
returnedList=productDialogPaneController.getSubProducts(selectedItem.getProductID()); // getting all subproducts of main Product
Iterator<Product> productIterator = returnedList.iterator();
boolean inStock=true;
while (productIterator.hasNext()){
Product currentSubProduct = productIterator.next();
int totalSubQ=returnTotalQuantity(currentSubProduct);
if((currentSubProduct.getQuantity()*inputQuantity)>currentSubProduct.getStock()-totalSubQ){
//eğer eklenmek istenen alt ürünün tanımlanan Miktarı*Alınmak istenen Main ürünün miktarı stok kapasitesinden fazla değilse
//sub products should multiply with main product quantity
inStock=false;
}
}
if(inStock==true){
if(shoppingBasket!=null && !shoppingBasket.isEmpty()){
Iterator mainIterator=shoppingBasket.iterator();
while (mainIterator.hasNext()){
Product oldMain= (Product) mainIterator.next();
if(oldMain.getProductID()==selectedItem.getProductID()){
oldMain.setQuantity(oldMain.getQuantity()+inputQuantity);
}
}
Iterator subItemIterator=returnedList.iterator();
while (subItemIterator.hasNext()){
Product newSubItem = (Product) subItemIterator.next();
Iterator ShoppingIterator = shoppingBasket.iterator();
while (ShoppingIterator.hasNext()){
Product oldSubItem= (Product) ShoppingIterator.next();
if(oldSubItem.getProductID()==newSubItem.getProductID() && oldSubItem.getSubProduct()!=1){
oldSubItem.setQuantity((newSubItem.getQuantity()*inputQuantity)+oldSubItem.getQuantity());
calculateTotalPriceofShoppingBasket();
}
}
}
}else{
selectedItem.setQuantity(inputQuantity);
shoppingBasket.add(selectedItem);
// we should multiply subItem Quantity with new InputQuantity
Iterator iterator = returnedList.iterator();
while (iterator.hasNext()){
Product newQforSubItem= (Product) iterator.next();
newQforSubItem.setQuantity(inputQuantity*newQforSubItem.getQuantity());
}
shoppingBasket.addAll(returnedList);
}
}else{
System.out.println("ALMAK İSTEDİĞİNİZ MAİN ÜRÜNLE BİRLİKTE ALINMASI GEREKEN ALT ÜRÜNLERDEN BİRİ VEYA BİRKAÇI STOKTA YOK!");
//one of sub product out of its stock capacity
}
}else{ //eğer sub ürünü yoksa (selectedItem.getSubProduct==0)
//if its not main product in other word if its standart Product
selectedItem.setQuantity(inputQuantity);
Iterator standartProduct = shoppingBasket.iterator();
if(!shoppingBasket.isEmpty()&&shoppingBasket!=null) {
while (standartProduct.hasNext()) {
Product standart = (Product) standartProduct.next();
if (standart.getProductID() == selectedItem.getProductID()) {
standart.setQuantity(standart.getQuantity() + inputQuantity);
calculateTotalPriceofShoppingBasket();
}
}
}else { // shoppingbasket is empty
selectedItem.setQuantity(inputQuantity);
shoppingBasket.add(selectedItem);
}
}
}else{
System.out.println("ALMAK İSTEDİĞİNİZ MAİN ÜRÜN STOKTA YETERİ KADAR YOK");
//the product you wanted to buy is out of stock capacity
}
}else{ // eğer ürün listesinden bir ürün seçilmediyse
System.out.println("ALIŞ VERİŞ SEPETİNE EKLENECEK ÜRÜNÜ SEÇMEDİNİZ !");
//no item selected to buy
}
if（tableProductInfo.getSelectionModel（）.getSelectedItem（）！=null）{//eğer birürün seçiliyse//？
Product selectedItem=（Product）tableProductInfo.getSelectionModel（）.getSelectedItem（）//
int inputQuantity=getInputDialogPane（）；//Kaçtaneürün eklenmek istiyor？//用户想要购买多少产品？
int totalQ=returnTotalQuantity（selectedItem）；//如果此商品已添加到购物篮中，则我们将包含添加的数量
如果（selectedItem.getStock（）-totalQ>=inputQuantity）{//STOK KONTROL eğer eklenmek istenenürün stokta varsa//检查股票是否可出售
//选择编辑项设置数量（输入数量）；
if（selectedItem.getSubProduct（）==1）{//eğer subürünüvarsa//如果所选产品具有子产品
//这意味着它的主要产品，我们需要检查它的子产品
//1） subürün Listsini al，//获取selectedItem的所有子管道
//2） subürün stok kontrollerini yap main.Quantity*sub.Quantity你问的问题很不清楚。确切的问题是什么？链接到外部截图并不表明问题是什么。请注意，不要发布外部截图的链接；如果需要，将图像嵌入到你的帖子中。你可以在我想的地方看到我的问题将我的文字改为粗体。但让我再次澄清一下。当用户在不同时间将同一产品添加到购物车时，我想更新购物表视图“我试图像这样更新shoppingBasket（observableList）上的产品数量，但它没有按我所希望的那样工作。”该代码看起来（大部分）对我来说是正确的。这是怎么回事“没有按我想要的那样工作”的意思是？那代码的结果到底是什么？看起来你需要做这样的事情。if（checkouttable.contains（item）{//Increment item quantity}或者{//add new item}
。你为什么要删除旧产品？为什么不只是提高它们的质量？你总是可以创建自己的equals（）
和hashcode（）
方法来比较ID，而不是使用循环。然后仍然可以使用contains（）
方法。
if(tableProductInfo.getSelectionModel().getSelectedItem()!=null){ // eğer bir ürün seçiliyse // if any product selected?
Product selectedItem = (Product) tableProductInfo.getSelectionModel().getSelectedItem(); //
int inputQuantity = getInputDialogPane(); // Kaç tane ürün eklenmek istiyor? // how many products user wants to buy?
int totalQ=returnTotalQuantity(selectedItem); // if this item added already in the shopping basket we are subsraction added quantity
if(selectedItem.getStock()-totalQ>=inputQuantity){ // STOK KONTROL eğer eklenmek istenen ürün stokta varsa // Checking stock if its avaliable for selling
//selectedItem.setQuantity(inputQuantity);
if (selectedItem.getSubProduct()==1){ // eğer sub ürünü varsa // if selected product has subProducts
//that means its main product and we need to check its sub products
//1)sub ürün listesini al, // get all subProducts of selectedItem
//2) sub ürün stok kontrollerini yap main.Quantity*sub.Quantity <= Sub.stock // check its stock
//3) eğer stokta varsa tabloya ekle yoksa uyarı ver // if any of subitems out of stock capasity then don't let user to buy the main product and its subProducts
ProductDialogPaneController productDialogPaneController = new ProductDialogPaneController();
ObservableList returnedList =FXCollections.observableArrayList();
returnedList=productDialogPaneController.getSubProducts(selectedItem.getProductID()); // getting all subproducts of main Product
Iterator<Product> productIterator = returnedList.iterator();
boolean inStock=true;
while (productIterator.hasNext()){
Product currentSubProduct = productIterator.next();
int totalSubQ=returnTotalQuantity(currentSubProduct);
if((currentSubProduct.getQuantity()*inputQuantity)>currentSubProduct.getStock()-totalSubQ){
//eğer eklenmek istenen alt ürünün tanımlanan Miktarı*Alınmak istenen Main ürünün miktarı stok kapasitesinden fazla değilse
//sub products should multiply with main product quantity
inStock=false;
}
}
if(inStock==true){
if(shoppingBasket!=null && !shoppingBasket.isEmpty()){
Iterator mainIterator=shoppingBasket.iterator();
while (mainIterator.hasNext()){
Product oldMain= (Product) mainIterator.next();
if(oldMain.getProductID()==selectedItem.getProductID()){
oldMain.setQuantity(oldMain.getQuantity()+inputQuantity);
}
}
Iterator subItemIterator=returnedList.iterator();
while (subItemIterator.hasNext()){
Product newSubItem = (Product) subItemIterator.next();
Iterator ShoppingIterator = shoppingBasket.iterator();
while (ShoppingIterator.hasNext()){
Product oldSubItem= (Product) ShoppingIterator.next();
if(oldSubItem.getProductID()==newSubItem.getProductID() && oldSubItem.getSubProduct()!=1){
oldSubItem.setQuantity((newSubItem.getQuantity()*inputQuantity)+oldSubItem.getQuantity());
calculateTotalPriceofShoppingBasket();
}
}
}
}else{
selectedItem.setQuantity(inputQuantity);
shoppingBasket.add(selectedItem);
// we should multiply subItem Quantity with new InputQuantity
Iterator iterator = returnedList.iterator();
while (iterator.hasNext()){
Product newQforSubItem= (Product) iterator.next();
newQforSubItem.setQuantity(inputQuantity*newQforSubItem.getQuantity());
}
shoppingBasket.addAll(returnedList);
}
}else{
System.out.println("ALMAK İSTEDİĞİNİZ MAİN ÜRÜNLE BİRLİKTE ALINMASI GEREKEN ALT ÜRÜNLERDEN BİRİ VEYA BİRKAÇI STOKTA YOK!");
//one of sub product out of its stock capacity
}
}else{ //eğer sub ürünü yoksa (selectedItem.getSubProduct==0)
//if its not main product in other word if its standart Product
selectedItem.setQuantity(inputQuantity);
Iterator standartProduct = shoppingBasket.iterator();
if(!shoppingBasket.isEmpty()&&shoppingBasket!=null) {
while (standartProduct.hasNext()) {
Product standart = (Product) standartProduct.next();
if (standart.getProductID() == selectedItem.getProductID()) {
standart.setQuantity(standart.getQuantity() + inputQuantity);
calculateTotalPriceofShoppingBasket();
}
}
}else { // shoppingbasket is empty
selectedItem.setQuantity(inputQuantity);
shoppingBasket.add(selectedItem);
}
}
}else{
System.out.println("ALMAK İSTEDİĞİNİZ MAİN ÜRÜN STOKTA YETERİ KADAR YOK");
//the product you wanted to buy is out of stock capacity
}
}else{ // eğer ürün listesinden bir ürün seçilmediyse
System.out.println("ALIŞ VERİŞ SEPETİNE EKLENECEK ÜRÜNÜ SEÇMEDİNİZ !");
//no item selected to buy
}