collections

问题 I have a function call resource of the day which I have duplicated and changed to be called Editors Picks. The function looks in the DB and grabs a ramdom image based on value and todays date. Here is the SQL Line: sql_value( "select resource value from resource_data where resource > 5 and resource_type_field=$rotd_field and value like '" . date("Y-m-d") . "%' limit 1;" ,0); I would like to try and adapt this line to pull in a collection instead, this is the SQL line that pulls in a

问题 I want to be able to create list (collection, array) filled with my own methods and in each step of iteration call the method. What's the best solution for this? I want something like this: List a = new List(); a.add(myCustomMethod1()); a.add(myCustomMethod2()); Object o = new Object(); for (Method m : a){ m(o); } 回答1: In Java, you can do this with reflection by making a list of Method objects. However, an easier way is to define an interface for objects that have a method that takes an

问题 how to sort a list by date in android List<ItemBean> listIB = new ArrayList<ItemBean>(); for(int i=0; i<DispLibActivity.itemListVect.size(); i++) { listIB.add(DispLibActivity.itemListVect.get(i)); } ItemBean class have a member date public class ItemBean implements Parcelable{ String item_id, item_title, image_url, link_url, description, publish_date, in_app_date, sub_section_id, type, duration, orig_url, sync; .... .... } I want to sort list "listIB" with its member "publish_date" 回答1: use

问题 I have set of 100000 String. And for example I want to get all strings starting with "JO" from that set. What would be the best solution for that? I was thinking Aho-Corasick but the implementation I have does not support wild cards. 回答1: If you want all the strings starting with a sequence you can add all the String into a NavigableSet like TreeSet and get the subSet(text, text+'\uFFFF') will give you all the entries starting with text This lookup is O(log n) If you want all the Strings with

问题 When I run (respectively): package containers; import java.util.*; public static void main(String[] args) { List<Integer> arLst = new ArrayList<Integer>(); List<Integer> lnLst = new LinkedList<Integer>(); long start = System.currentTimeMillis(); for (int i = 0; i < 10000000; i++) { arLst.add(i); } System.out.println("Array list: "+Long.toString(System.currentTimeMillis()-start)); start = System.currentTimeMillis(); for (int i = 0; i < 10000000; i++) { lnLst.add(i); } System.out.println(

问题 Hello I found that in python 3.6: cnt = collections.Counter(['red', 'blue', 'red', 'green', 'blue', 'blue']) print(cnt) # >>> Counter({'blue': 3, 'red': 2, 'green': 1}) in the document, it says 'elements() Return an iterator over elements repeating each as many times as its count. Elements are returned in arbitrary order .' However: print(list(cnt.elements())) will always give me: ['red', 'red', 'blue', 'blue', 'blue', 'green'] I don't think it is arbitrary order anymore, it kind of depends

问题 I'm iterating through the GridView rows and cells to get the values and store them in a 2D array . This is my code: for (int i = 0; i < GridView2.Rows.Count; i++) { for (int j = 0; j < (GridView2.Rows[i].Cells.Count - 3); j++) { // using the labels of the template fields..... Label values = (Label)GridView2.Rows[i].Cells[j].FindControl("Label" + j); GridValues[i,j] = values.Text; // gridvalues is my 2d array. } } What I need now is to make the same values I got from the above loop to be added

问题 I have a partial that I want rendered with a collection and another variable. Is it possible to pass more than one variable to a partial? To illustrate: Category HABTM Brands This is just semi-pseudo-code, but I want to do something like: <% @categories.each do |c| %> <%= c.name %> <%= render :partial => "mypartial", :collection => c.brands, :object => c.id %> <% end %> The partial needs the category id as well as the "current_brand". Any ideas? 回答1: Inside of your view, you pass a hash to

问题 I am trying to create a WPF based PropertyGrid. Recently i tried wpg.codeplex.com project, but i had some problems with this control. Now, i am trying to develop http://blog.joachim.at/?p=36 this project. I successfully added Enum Values, support but i have got problems with collections. For example my custom object has a property that name is City and type is Guid. I want, users can select City from combobox. I was fighting with TypeConverts, IValueConverts, and etc.. How can i solve this?

问题 I was able to make an ordered list of categories with child products, now i need to add a list of products that are not related to any category 回答1: This should give you what you want: $collection = Mage::getModel('catalog/product')->getCollection() ->addAttributeToFilter('category_ids',''); 来源： https://stackoverflow.com/questions/3717664/magento-get-a-list-of-products-that-are-not-related-to-any-category