ArrayList(Int32) constructor is used to initialize a new instance of the ArrayList class which will be empty and will have the specified initial capacity. ArrayList represents an ordered collection of an object that can be indexed individually. It is basically an alternative to an array. It also allows dynamic memory allocation, adding, searching and sorting items in the list.
Syntax: public ArrayList (int capacity);
Here, capacity is the number of elements that the new list can initially store.
Exception: This will give ArgumentOutOfRangeException if the capacity is less than zero.
- The number of elements that an ArrayList can hold is known as the Capacity of the ArrayList. If the elements will be added to the ArrayList then capacity will be automatically increased by reallocating the internal array.
- Specifying the initial capacity will eliminate the requirement to perform a number of resizing operations while adding elements to the ArrayList if the size of the collection can be estimated.
- This constructor is an O(n) operation, where n is capacity.
Below programs illustrate the use of above-discussed constructor:
Number of elements: 0 Capacity of ArrayList: 10 Number of elements: 4 Capacity of ArrayList: 10
Example 2: For ArgumentOutOfRangeException
System.ArgumentOutOfRangeException: ‘capacity’ must be non-negative.
Parameter name: capacity
- C# | Creating StringBuilder having specified capacity
- C# | Creating a Case-Sensitive HybridDictionary with specified initial size
- C# | Creating a HybridDictionary with specified initial size & case sensitivity
- C# | Sets the capacity to the actual number of elements in the ArrayList
- C# | Creating a read-only wrapper for the ArrayList
- C# | Creating a synchronized (thread-safe) wrapper for the ArrayList
- How to set the initial delay of the ToolTip in C#?
- C# | Capacity of a List
- C# | Capacity of a SortedList
- How to find the Capacity of a StringBuilder in C#
- C# | Setting the capacity to the actual number of elements in a SortedList object
- ArrayList in C#
- C# | Creating a read-only wrapper for List
- C# | Creating a read-only wrapper for the List
- C# | ArrayList Class
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to firstname.lastname@example.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.