collections

问题 I have a feeling that this is stupid question, but I'll ask anyway... I have a collection of NSDictionary objects whose key/value pairs correspond to a custom class I've created, call it MyClass . Is there an easy or "best practice" method for me to basically do something like MyClass * instance = [ map NSDictionary properties to MyClass ]; ? I have a feeling I need to do something with NSCoding or NSKeyedUnarchiver , but rather than stumble through it on my own, I figure someone out there

问题 My script returns me a Array (JSON Array) as follows : [{redirectCount=0, encodedBodySize=60962, unloadEventEnd=0, responseEnd=1601.699999999255, domainLookupEnd=995.7999999896856, unloadEventStart=0, domContentLoadedEventStart=1970.3999999910593, type=navigate, decodedBodySize=215675, duration=3103.799999997136, redirectStart=0, connectEnd=1357.1999999985565, toJSON={}, requestStart=1359.599999996135, startTime=0, fetchStart=1598.6999999877298, serverTiming=[], domContentLoadedEventEnd=1981

问题 What are the considerations of using Iterable<T> vs. Collection<T> in Java? For example, consider implementing a type that is primarily concerned with containing a collection of Foo s, and some associated metadata. The constructor of this type allows one-time initialisation of the object list. (The metadata can be set later.) What type should this constructor accept? Iterable<Foo> , or Collection<Foo> ? What are the considerations for this decision? Following the pattern set forth by library

问题 What are the considerations of using Iterable<T> vs. Collection<T> in Java? For example, consider implementing a type that is primarily concerned with containing a collection of Foo s, and some associated metadata. The constructor of this type allows one-time initialisation of the object list. (The metadata can be set later.) What type should this constructor accept? Iterable<Foo> , or Collection<Foo> ? What are the considerations for this decision? Following the pattern set forth by library

问题 i am making applications in c#.In that application i have one class as DataCapture.cs . In same application i have another class as Listner.cs . Here in Listner.cs class i want to use object of DataCapture.cs without creating new object of DataCapture.cs . As if i am creating new object of DataCapture.cs ,i cant access the the data DataCapture.cs as it creates the new instance of class and all data gets lost as i am using collection in DataCapture.cs .Please help me.Thanks in advance. 回答1:

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . In my Dispose method I am disposing everything a Dataset has as below: foreach (DataTable myTable in this.Tables) { myTable.Dispose(); } Here this.Tables is public DataTableCollection Tables { get; } I am having around 56 tables in this.Tables when it comes near to this call. It works fine for few tables but

问题 I have a LinkedHashSet of values of ThisType . ThisType is implementing the interface ThatType . I need the polymorphic use of this collection-- be able to point to it as LinkedHashSet< ThatType >. How is this done? i know this is a naive question, but several things i tried didn't work, and i wanna do it the right way. Thanks in advance. //============================== UPDATE: more details: In the following code, ThisType implements ThatType -- ThatType is an interface. //LinkedHashMap

问题 I inadvertently typed time.clock<() with the Python 2.7 interpreter response being: True . The following code exemplifies the behavior: >>> repr(time.clock) '<built-in function clock>' >>> time.clock<() True Moreover: >>> import sys >>> sys.maxint < () True >>> map(lambda _:0<_,((),[],{})) [True, True, True] In contrast: >>> 1<set(()) TypeError: can only compare to a set Question: Besides why, is there a practical meaning or purpose of an empty list , tuple or dict evaluating as if were

问题 I have an IEnumerable<Point> collection. Lets say it contains 5 points (in reality it is more like 2000) I want to order this collection so that a specifc point in the collection becomes the first element, so it's basically chopping a collection at a specific point and rejoining them together. So my list of 5 points: {0,0}, {10,0}, {10,10}, {5,5}, {0,10} Reordered with respect to element at index 3 would become: {5,5}, {0,10}, {0,0}, {10,0}, {10,10} What is the most computationally efficient

问题 I have a custom class like Person: public class Person { int age; String name; } Now I want to sort Person class objects based on age . So I will use Comparable interface and implement compareTo() method. And compareTo will have logic to compare person object based on just age . So if I do : Collections.sort(list); // where list is a list of person I will get sorted person list based on age . But I read somewhere, we need to override equals() method as well when we do Comparable