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. ArrayList.Remove(Object) method is used to remove the first occurrence of a specific object from the ArrayList.
- Elements can be added or removed from the Array List collection at any point in time.
- The ArrayList is not guaranteed to be sorted.
- The capacity of an ArrayList is the number of elements the ArrayList can hold.
- Elements in this collection can be accessed using an integer index. Indexes in this collection are zero-based.
- It also allows duplicate elements.
- Using multidimensional arrays as elements in an ArrayList collection is not supported.
public virtual void Remove (object obj);
Here, obj is the Object to remove from the ArrayList. The value can be null.
Exceptions: This method will give NotSupportedException if the ArrayList is read-only or has a fixed size.
Below given are some examples to understand the implementation in a better way:
The elements in ArrayList initially are : C C# Java C# PHP C# The elements in ArrayList are : C Java C# PHP C#
The elements in ArrayList initially are : Geeks Noida Classes GFG DS Algorithms The elements in ArrayList are : Geeks Noida Classes GFG DS Algorithms
- This method performs a linear search, therefore, this method is an O(n) operation, where n is Count.
- If the ArrayList does not contain the specified object, the ArrayList remains unchanged. No exception is thrown.
- C# | Remove the first occurrence from the StringCollection
- C# | Removing first occurrence of object from Collection<T>
- C# | Check if a SortedList object contains a specific value
- C# | Check whether a SortedList object contains a specific key
- C# | Replacing the value at a specific index in a SortedList object
- C# | Add an object to the end of the ArrayList
- C# | Remove all elements from the ArrayList
- C# | Remove the element at the specified index of the ArrayList
- C# | Remove a range of elements from the ArrayList
- C# | Removing first occurrence of specified value from LinkedList<T>
- C# | Index of first occurrence in StringCollection
- C# | First occurrence in the List that matches the specified conditions
- C# | Check whether a Hashtable contains a specific key or not
- C# | Set the bit at a specific position in the BitArray to the specified value
- C# | Check if the StringDictionary contains a specific key
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to email@example.com. 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.