CODEWITHSUNDEEP
c#
Abhishek
Abhishek

Reputation: 7035

new String() doesn't create new reference object in c#?

Edit:

Why this question is not duplicate? I'm not asking difference between .Equals() and ==. I'm asking how does actually == work. I mean, when I created strings using different method, I should have seen different result. But I see same result.

I was looking into == operator in c#. To my surprise it gave same result for following codes (contrary to JAVA). But according to this, == is for reference check and I should see different result for my code then why do I see same result for both of them? Shouldn't I see different results for my piece of codes? Is it because new String() in c# doesn't generate new reference?

 String s = "abc";
 String s1 = "abc";
 Console.WriteLine("Expected output: True, Actual output: " + (s1==s).ToString());

Output

Expected output: True, Actual output: True

Another code check

    String s2 = new String("abc".ToCharArray());
    String s3 = new String("abc".ToCharArray());
    Console.WriteLine("Expected output: False, Actual output: " + (s2 == s3).ToString());

Output

Expected output: False, Actual output: True

Note: I understand difference reference & value check. I've tried result with ReferenceEquals and it shows expected result to me.

Upvotes: 1

Views: 184

Answers (2)

Nikhil Agrawal
Nikhil Agrawal

Reputation: 48558

Normally for reference types == operator do check for reference equality.

String is also a reference type but in String class == operator is overloaded to check for content equality and not reference equality.

It says and I quote

Determines whether two specified strings have the same value.

Read here https://msdn.microsoft.com/en-us/library/system.string.op_equality(v=vs.110).aspx

FYI, in string != operator is also oveloaded to check for string content inequality.

Upvotes: 7

x2.
x2.

Reputation: 9668

In c# operator == for string compares value, not reference.

Upvotes: 1

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