What is the difference between Array and Arraylist?

YasminRadwan26

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2022-06-27

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c# programming, Interview questions, c# programming Interview-questions,

YasminRadwan26

2022-06-27

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There are some differences between a ref and an out that I have arranged in a table for easier comparison:

Array	ArrayList
An Array is strongly-typed. We can store only the same type of data.	ArrayList is a non-generic collection type. ArrayList’s internal Array is of the object type. So, we can store multiple types of data in ArrayList.
Array stores a fixed number of elements.	ArrayList is dynamic in terms of capacity. If the number of elements exceeds, ArrayList will increase to double its current size.
Array provides better performance than ArrayList.	If we are using a large number of ArrayList then it degrades performance because of boxing and unboxing.
Array uses static helper class Array which belongs to system namespace	ArrayList implements an IList interface so, it provides a method that we can use for easy implementation.
Array belongs to namespace System	ArrayList belongs to the namespace System.Collection
The Array cannot accept null.	An Array can accept null.
`Example:string[] array1=new string[5];array1[0]=”Hello”;array1[1]=”Bye”;`	`Example:ArrayList a1=new ArryList();a1.add(null);a1.insert(1,”hi”);a1.add(3);a1.add(8.23);`

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