I am having some trouble creating a for loop within a constructor to iterate over a map and an array at the same time. Here, it is indicated that this cannot be done with an enhanced for loop. I have something like this, which raises a compiler error. Basically, the class has a Map which I want to populate via the constructor which take...
I have something like this: something need here = scope.getConnections(); //getConnections() returns Collection<Set<IConnection>> I need to iterate through all connections (the stuff that the getConnections() returns) How to do that ? ...
Say I have a class public class TimestampedTrackId { private readonly int trackId; private readonly DateTime insertTime; public TimestampedTrackId(int trackId, DateTime insertTime) { this.trackId = trackId; this.insertTime = insertTime; } public int TrackId { get { ...
I have a sorted map and want to reference its ordered objects by their index position. Is this possible? How would I convert a sorted map to an array list while maintaining the ordering, so I can retrieve an object by its index (order). Is this the only way to do it? Ideally I could have this structure, and would know the index of an ob...
Is there a class that represents the concatenation of a collection with another collection? This class should be a Collection in itself, and should delegate all methods to the underlying (inner) collections - no extra memory should be allocated, nor any of the original collections modified. Example usage: Collection<String> foo = ... C...
Hi I am developing a parser that needs to put key value pairs in hashmap. But a key can have multiple values which i can do in this way HashMap<String,ArrayList<String>> . But what happens if number of keys are very large and it start matching with other key's hashcode. Will that rewrite previous key's value ? thanks -devSunday ...
Hi i have set of 2D arrays and i want store all 2D arrays into single list how can do this in java? ...
Which class implements all the Connection Interfaces which are in javax.microedition.io package and how? And in the same way which class implements the some of Collection interfaces like Iterator interface. I saw a code: - Iterator it; ArrayList list = new ArrayList(); it = list.iterator(); The iterator() return type is "Iterator"...
Hi all, wanna ask for your opinion. What would be the best object (Array, List<>, Collection,...) used in webservice when returning list of business objects. Like a list of customer or history list. Some ideas: because I want minimize amount of data transafered between client and server because I want simplify xml serialization I dont...
I'm a bit surprised by System.Collections.Generic.SortedList, in that It requires me to use <key, value> instead of <value>(comparer) It only allows on entry per value These seem quirky in the way I want to use it (although I'm sure they're just right for other situations). Is there another collection that doesn't have these two cha...
Is there an analogous method to StringUtils.defaultString for collections, so you can avoid checking for null value, since in most cases, the desired effect is the same as if it were an empty list? e.g. to replace if (list != null) { for (String item: list) { // ... } } with something like for (String item: ListUtils.defaultList...
Hi, I'm trying to map a collection (of type map) using a foreign key and a fixed value as the key/mapping arguments. I have several tables of product types and a language table which holds stuff like product names and so on. Now let's say we have an Accessory table which holds (obviously) accessories, then the name of an accesory is s...
I was trying to write some code that looked like this: public List<IObject> getObject(){ ArrayList<ConcreteObject> objects = new ArrayList<ConcreteObject>(); return objects; } (Where ConcreteObject implements IObject) This doesn't work at all. It gives a compiler error. Does Java have plans to support this in the future? What is ...
i tried <appSettings > <add key="List" value="1"/> <add key="List" value="2"/> <add key="List" value="3"/> </appSettings > and System.Configuration.ConfigurationManager.AppSettings.GetValues("List"); But i only get the last member . How could i solve this easily? ...
I have the following model which I have created and mapped with nHibernate. Using lazy loading so I don't need to get the Vehicles for the Dealer at the start. Public class Dealer { public virtual string Name { get;set;} public virtual IList Vehicles { get;set;} } Now lets assume the Dealer has thousands of vehicles. If I do Dealer.Ve...
I am iterating over, and modifying a map (which is created from an existing group of enum objects) like the following: public class Dispenser { private Map<Ingredient, Integer> availableIngredients = new EnumMap<Ingredient, Integer>(Ingredient.class); public void orderSandwich(SandwichType sandwichType) { Map<Ingre...
I have created a sort function to allow a collection of instances of a custom object to be sorted based on one of the objects properties. Is it possible to extend the existing collections class in VBA? I do not believe inheritance is supported in VBA, so I am not sure how to go about this in the proper way. I could just create a new m...
MSDN vaguely mentions: A ReadOnlyCollection<(Of <(T>)>) can support multiple readers concurrently, as long as the collection is not modified. Even so, enumerating through a collection is intrinsically not a thread-safe procedure. To guarantee thread safety during enumeration, you can lock the collection during the entire enumeration....
Hi, I'm interested in sorting a collection, but also returning an index which can be used to map to the original position in the collection (before the sort). Let me give an example to be more clear: List<int> A = new List<int>(){3,2,1}; List<int> B; List<int> idx; Sort(A,out B,out idx); After which: A = [3,2,1] B = [1,2,3] idx ...
Can I somehow "instruct" LINQ to use binary search when the collection that I'm trying to search is ordered. I'm using an ObservableCollection<T>, populated with ordered data, and I'm trying to use Enumerable.First(<Predicate>). In my predicate, I'm filtering by the value of the field my collection's sorted by. ...