Synchronized(ArrayList) method is used to get an ArrayList wrapper that is synchronized (thread safe).
Syntax:
public static System.Collections.ArrayList Synchronized (System.Collections.ArrayList list);
Here, the list is the ArrayList which is to be synchronized.
Return Value: It returns an ArrayList wrapper which is synchronized (thread safe).
Exception: This method throws ArgumentNullException if the list is null.
Below programs illustrate the use of above-discussed method:
Example 1:
// C# code to check if ArrayList // Is Synchronized or not using System;
using System.Collections;
class GFG {
// Driver code
public static void Main()
{
// Creating an ArrayList
ArrayList myList = new ArrayList();
// Adding elements to ArrayList
myList.Add( "Geeks" );
myList.Add( "for" );
myList.Add( "Geeks" );
myList.Add( "Noida" );
myList.Add( "Geeks Classes" );
myList.Add( "Delhi" );
// Creates a synchronized
// wrapper around the ArrayList
ArrayList smyList = ArrayList.Synchronized(myList);
// Displays the synchronization
// status of both ArrayList
Console.WriteLine( "myList is {0}." , myList.IsSynchronized ?
"Synchronized" : "Not Synchronized" );
Console.WriteLine( "smyList is {0}." , smyList.IsSynchronized ?
"Synchronized" : "Not Synchronized" );
}
} |
Output:
myList is Not Synchronized. smyList is Synchronized.
Example 2:
// C# code to check if ArrayList // Is Synchronized or not using System;
using System.Collections;
class GFG {
// Driver code
public static void Main()
{
// Creating an ArrayList
ArrayList myList = new ArrayList();
// Adding elements to ArrayList
myList.Add( "Geeks" );
myList.Add( "for" );
myList.Add( "Geeks" );
myList.Add( "Noida" );
myList.Add( "Geeks Classes" );
myList.Add( "Delhi" );
// it will give error as
// the parameter is null
ArrayList smyList = ArrayList.Synchronized( null );
}
} |
Runtime Error:
Unhandled Exception:
System.ArgumentNullException: Value cannot be null.
Parameter name: list
Note: For the thread safety of the ArrayList, all operations must be done through this wrapper.
Reference: