如何在for循环中调用class参数?
how to call class parameter inside the for loop?
问题:无法在for循环语句中调用class参数
实施:我需要调用此 class 以便我的其余 api 列表能够正常工作并显示所有数据。
问题:无法在for循环语句中调用class参数
实施:我需要调用此 class 以便我的其余 api 列表能够正常工作并显示所有数据。
//this is working and able to get all the data, which the output is in "cmd";
public void ool8(){
Product pBuilder = Product.newBuilder().build();
ProductList productList = productServiceBlockingStub.findAllRepeated(pBuilder);
List<Product> products2 = productList.getProductList();
for (Iterator iterator = products2.iterator(); iterator.hasNext();) {
Product product = (Product) iterator.next();
ProductEntity productEntity2 = new ProductEntity(
product.getPurchaseItem(),
product.getProductname(),
product.getProductbrand(),
product.getProductprice(),
product.getProductdescription(),
product.getProductquantity(),
product.getProductexpirationdate()
);
List<ProductEntity> list = new ArrayList<>();
list.add(productEntity2);
System.out.println(list);
}
//this is Not working cannot call the "productEntity2" outside the for loop;
//I need return in a method List<ProductEntity> for rest api implementation.
public List<ProductEntity> ool8(){
List<ProductEntity> list = new ArrayList<>();
Product pBuilder = Product.newBuilder().build();
ProductList productList = productServiceBlockingStub.findAllRepeated(pBuilder);
List<Product> products2 = productList.getProductList();
for (Iterator iterator = products2.iterator(); iterator.hasNext();) {
Product product = (Product) iterator.next();
ProductEntity productEntity2 = new ProductEntity(
product.getPurchaseItem(),
product.getProductname(),
product.getProductbrand(),
product.getProductprice(),
product.getProductdescription(),
product.getProductquantity(),
product.getProductexpirationdate()
);
}
//this is the issue calling "productEntity2" outside of for loop
list.add(productEntity2);
System.out.println(list);
return list;
}
productEntity2
位于 for
循环的 scope 中,您在那里创建了它。因此,您不能在循环(其范围)之外调用 productEntity2
。在我看来,对于 iterator
中的每个产品,您想向 list
添加一个实体,因此正确的做法是将 list.add(productEntity2);
放入 for 循环(在结束,创建 productEntity2
).
问题:无法在for循环语句中调用class参数
实施:我需要调用此 class 以便我的其余 api 列表能够正常工作并显示所有数据。
问题:无法在for循环语句中调用class参数
实施:我需要调用此 class 以便我的其余 api 列表能够正常工作并显示所有数据。
//this is working and able to get all the data, which the output is in "cmd";
public void ool8(){
Product pBuilder = Product.newBuilder().build();
ProductList productList = productServiceBlockingStub.findAllRepeated(pBuilder);
List<Product> products2 = productList.getProductList();
for (Iterator iterator = products2.iterator(); iterator.hasNext();) {
Product product = (Product) iterator.next();
ProductEntity productEntity2 = new ProductEntity(
product.getPurchaseItem(),
product.getProductname(),
product.getProductbrand(),
product.getProductprice(),
product.getProductdescription(),
product.getProductquantity(),
product.getProductexpirationdate()
);
List<ProductEntity> list = new ArrayList<>();
list.add(productEntity2);
System.out.println(list);
}
//this is Not working cannot call the "productEntity2" outside the for loop;
//I need return in a method List<ProductEntity> for rest api implementation.
public List<ProductEntity> ool8(){
List<ProductEntity> list = new ArrayList<>();
Product pBuilder = Product.newBuilder().build();
ProductList productList = productServiceBlockingStub.findAllRepeated(pBuilder);
List<Product> products2 = productList.getProductList();
for (Iterator iterator = products2.iterator(); iterator.hasNext();) {
Product product = (Product) iterator.next();
ProductEntity productEntity2 = new ProductEntity(
product.getPurchaseItem(),
product.getProductname(),
product.getProductbrand(),
product.getProductprice(),
product.getProductdescription(),
product.getProductquantity(),
product.getProductexpirationdate()
);
}
//this is the issue calling "productEntity2" outside of for loop
list.add(productEntity2);
System.out.println(list);
return list;
}
productEntity2
位于 for
循环的 scope 中,您在那里创建了它。因此,您不能在循环(其范围)之外调用 productEntity2
。在我看来,对于 iterator
中的每个产品,您想向 list
添加一个实体,因此正确的做法是将 list.add(productEntity2);
放入 for 循环(在结束,创建 productEntity2
).