How to create a shallow copy of ArrayList in C#
ArrayList.Clone() Method is used to create a shallow copy of the specified ArrayList. A shallow copy of a collection copies only the elements of the collection irrespective of reference types or value types. But it does not copy the objects that the references refer to. The references in the new collection point to the same objects that the references in the original collection point to.
Syntax:
public virtual object Clone ();
Below programs illustrate the use of above-discussed method:
Example 1:
// C# code to illustrate the use // of ArrayList.Clone Method using System; using System.Collections; public class GFG { // Main Method public static void Main(String[] args) { // Creating an empty ArrayList ArrayList list = new ArrayList(); // Use Add() method // to Add elements // in the list list.Add( "Beginner" ); list.Add( "for" ); list.Add( "Beginner" ); list.Add( "10" ); list.Add( "20" ); // Displaying the list Console.WriteLine( "Elements of Original ArrayList: \n" ); // Displaying the elements in ArrayList foreach ( string str in list) { Console.WriteLine(str); } // Creating another ArrayList ArrayList sec_list = new ArrayList(); // using Clone() Method sec_list = (ArrayList)list.Clone(); // Displaying the Cloned ArrayList Console.WriteLine( "\nElements of Cloned ArrayList: \n" ); // Displaying the elements in ArrayList foreach ( string str1 in sec_list) { Console.WriteLine(str1); } } } |
Output:
Elements of Original ArrayList: Beginner for Beginner 10 20 Elements of Cloned ArrayList: Beginner for Beginner 10 20
Example 2:
// C# code to illustrate the use // of ArrayList.Clone Method using System; using System.Collections; public class GFG { // Main Method public static void Main(String[] args) { // Creating an empty ArrayList ArrayList list = new ArrayList(); // Use Add() method // to Add elements // in the list list.Add(10); list.Add(20); list.Add(30); list.Add(40); list.Add(50); // Displaying the list Console.WriteLine( "Elements of Original ArrayList: \n" ); // calling function Result(list); // using Clone() method ArrayList sec_list = (ArrayList)list.Clone(); // Displaying the Cloned ArrayList Console.WriteLine( "\nElements of Cloned ArrayList: \n" ); // calling function Result(sec_list); // adding a new value to // original ArrayList list.Add(60); Console.WriteLine( "\nAfter Adding, Original ArrayList: \n" ); // Calling function Result(list); Console.WriteLine( "\nAfter Adding, Cloned ArrayList: \n" ); // Calling function Result(sec_list); // checking for the equality // of References list and sec_list Console.WriteLine( "\nReference Equals: {0}" , Object.ReferenceEquals(list, sec_list)); } // method to display the values public static void Result(ArrayList ar) { // This method prints all the // elements in the ArrayList. foreach ( int i in ar) Console.WriteLine(i); } } |
Output:
Elements of Original ArrayList: 10 20 30 40 50 Elements of Cloned ArrayList: 10 20 30 40 50 After Adding, Original ArrayList: 10 20 30 40 50 60 After Adding, Cloned ArrayList: 10 20 30 40 50 Reference Equals: False
Reference:
- https://docs.microsoft.com/en-us/dotnet/api/system.collections.arraylist.clone?view=netframework-4.7.2
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