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 HybridDictionary with specified initial size & case sensitivity
- C# | Creating a Case-Sensitive HybridDictionary with specified initial size
- C# | Sets the capacity to the actual number of elements in the ArrayList
- C# | Insert an element into the ArrayList at the specified index
- C# | Remove the element at the specified index of the ArrayList
- C# | Reverse the order of the elements in the entire ArrayList or in the specified range
- C# | ArrayList whose elements are copies of the specified value
- C# | Get or set the element at the specified index in ArrayList
- C# | Copying the entire ArrayList to 1-D Array starting at the specified index
- C# | Creating a read-only wrapper for the ArrayList
- C# | Creating a synchronized (thread-safe) wrapper for the ArrayList
- C# | Creating an empty HybridDictionary with specified case sensitivity
- Creating an Index From the Specified Index at the Start of a Collection in C#
- Creating an Index From the End of a Collection at a Specified Index Position in C#
- Getting the name of the Enumeration Constant having Specified value in C#
- C# | Capacity of a List
- C# | Capacity of a SortedList
- C# | Setting the capacity to the actual number of elements in a SortedList object
- How to find the Capacity of a StringBuilder in C#
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