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C# | Check if two ArrayList objects are equal

Equals(Object) Method which is inherited from the Object class is used to check whether the specified ArrayList object is equal to another ArrayList object or not.

Syntax:

public virtual bool Equals (object obj);

Here, obj is the object which is to be compared with the current object.

Return Value: This method return true if the specified object is equal to the current object otherwise, false.

Below programs illustrate the use of above-discussed method:



Example 1:

// C# program to if a ArrayList
// is equal to itself or not
using System;
using System.Collections;
  
class Geeks {
  
    // Main Method
    public static void Main(String[] args)
    {
  
        // Creating a ArrayList
        ArrayList arrlist = new ArrayList();
  
        // Adding elements to ArrayList
        arrlist.Add(1);
        arrlist.Add(2);
        arrlist.Add(3);
        arrlist.Add(4);
        arrlist.Add(5);
  
        // Checking whether arrlistis
        // equal to itself or not
        Console.WriteLine(arrlist.Equals(arrlist));
    }
}

Output:

True

Example 2: The equals method only check if both ArrayList references refer to same object or not. It returns false if two objects are different, even if they have same values.

// C# program to if a ArrayList
// is equal to another ArrayList
using System;
using System.Collections;
  
class Geeks {
  
    // Main Method
    public static void Main(String[] args)
    {
  
        // Creating a ArrayList
        ArrayList arrlist = new ArrayList();
  
        // Adding elements to ArrayList
        arrlist.Add("This");
        arrlist.Add("is");
        arrlist.Add("C#");
        arrlist.Add("ArrayList");
        arrlist.Add("Tutorial.");
  
        // Creating an ArrayList
        ArrayList arrlist2 = new ArrayList();
  
        // Adding elements to ArrayList
        arrlist2.Add("This");
        arrlist2.Add("is");
        arrlist2.Add("C#");
        arrlist2.Add("ArrayList");
        arrlist2.Add("Tutorial.");
  
        // Checking whether arrlist is
        // equal to arrlist2 or not
        Console.WriteLine(arrlist.Equals(arrlist2));
  
        // Creating a ArrayList
        ArrayList arrlist3 = new ArrayList();
  
        // Assigning arrlist2 to arrlist3
        arrlist3 = arrlist2;
  
        // Checking whether arrlist3 is
        // equal to arrlist2 or not
        Console.WriteLine(arrlist3.Equals(arrlist2));
    }
}

Output:

False
True

Note: If the current instance is a reference type, the Equals(Object) method checks for reference equality.



This article is attributed to GeeksforGeeks.org

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