That is why I concluded that the speed of my program depends on the speed of the Collection and the only alternative to the Collection I know is an Array.īoth, Array and Collection - are reference type means that: When I copy the Graph I copy the link to the Node and only create a new Collection of Products. In the algorithm I just go through the collection of smth and do smth. I don't specify the size of the collection because I don't know it in advance (only the upper bound) I use only generic collections and always specify the type of the elements (so I don't have any boxing/unboxing). The Graph consists of two Collections (Of Node), each Node keeps a Collection of outgoing Arcs. Each Node have at least one Collection (of Product), same for the Arcs. I use only classes for the Nodes, Products, Arcs. In short, my problem is - minimizing the cost of Flow (of product) in the Graph. It’s true that I am new here, next time I will be more careful in where it is better to post my question. Difficult to say without more information. Could even be that a database approach might be better. Give me some more information on what your storing, how much your storing, and how your accessing whats stored. Generic collections might help in this case. If you access a collection like this in a loop it would be very slow. The integer needs to boxed into an object going into the collection and then unboxed to an integer when being accessed. If your storing objects in your collection then boxing and unboxing could be happening, for example storing integers in a collection that stores types of object will slow things down. Its very difficult to make a suggestion like this without knowing about whats being stored (types of object, or single type), the amount of data your storing (100,000 records), and how your accessing the collections (for example is boxing / unboxing happening). You may have called your post slow collections which someone could search for and they could read the recommendation. Sets the capacity to the actual number of elements in the ArrayList.It's your first post so it's ok but generally it's not recommended that you ask a new question at the end of another question, it's only encase someone else has a similar query and does a search. Public Overridable Sub SetRange (index As Integer, c As ICollection )Ĭopies the elements of a collection over a range of elements in the ArrayList. Reverses the order of the elements in the ArrayList. Removes a range of elements from the ArrayList. Public Overridable Sub RemoveRange (index As Integer, count As Integer) Removes the element at the specified index of the ArrayList. Public Overridable Sub RemoveAt (index As Integer) Removes the first occurrence of a specific object from the ArrayList. Public Overridable Sub Remove (obj As Object ) Inserts the elements of a collection into the ArrayList at the specified index. Public Overridable Sub InsertRange (index As Integer, c As ICollection) Inserts an element into the ArrayList at the specified index. Public Overridable Sub Insert (index As Integer, value As Object) Returns the zero-based index of the first occurrence of a value in the ArrayList or in a portion of it. Public Overridable Function IndexOf (value As Object) As Integer Returns an ArrayList, which represents a subset of the elements in the source ArrayList. Public Overridable Function GetRange (index As Integer, count As Integer ) As ArrayList Public Overridable Function Contains (item As Object) As Booleanĭetermines whether an element is in the ArrayList. Public Overridable Sub AddRange (c As ICollection)Īdds the elements of an ICollection to the end of the ArrayList. Public Overridable Function Add (value As Object) As IntegerĪdds an object to the end of the ArrayList. The following table lists some of the commonly used methods of the ArrayList class − Sr.No. Gets or sets the element at the specified index. Gets a value indicating whether the ArrayList is read-only.
Gets a value indicating whether the ArrayList has a fixed size. Gets the number of elements actually contained in the ArrayList. Gets or sets the number of elements that the ArrayList can contain. The following table lists some of the commonly used properties of the ArrayList class − Sr.No.
Properties and Methods of the ArrayList Class It also allows dynamic memory allocation, adding, searching and sorting items in the list. However, unlike array, you can add and remove items from a list at a specified position using an index and the array resizes itself automatically. It is basically an alternative to an array. It represents an ordered collection of an object that can be indexed individually.
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