What is mutable and immutable?

Posted Date: 24 Dec 2007 Posted By:: venkat Member Level: Gold Member Rank: 0 Points: 2 Responses: 5

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#172436 Author: Satish Kumar J Member Level: Gold Member Rank: 30 Date: 24/Dec/2007 Rating: Points: 2
String is immutable i.e. Strings cannot be altered. When you alter a string (by adding to it for example), you are actually creating a new string. But StringBuilder is not immutable so if u have to alter a string many times, such as mutliple concatenations then use StringBuilder. more info http://www.dotnetspider.com/qa/Question57725.aspx Regards, Satish, Regards, Satish My Blog

#172437 Author: Vadivel Mohanakrishnan Member Level: Gold Member Rank: 27 Date: 24/Dec/2007 Rating: Points: 2
An object qualifies as being called immutable if its value cannot be modified once it has been created. For example, methods that appear to modify a String actually return a new String containing the modification. Developers are modifying strings all the time in their code. This may appear to the developer as mutable - but it is not. What actually happens is your string variable/object has been changed to reference a new string value containing the results of your new string value. For this very reason .NET has the System.Text.StringBuilder class. If you find it necessary to modify the actual contents of a string-like object heavily, such as in a for or foreach loop, use the System.Text.StringBuilder class. Source:: http://blogs.crsw.com/mark/archive/2004/08/06/449.aspx Best Regards Vadivel MVP SQL Server SQL Server Tips n Tricks

#172579 Author: kumar Member Level: Gold Member Rank: 156 Date: 25/Dec/2007 Rating: Points: 2
Hi, immutable means data value may not be changed but mutable means data value will be changed. thanks and regards, kumar

#278671 Author: asdf Member Level: Silver Member Rank: 0 Date: 08/Aug/2008 Rating: Points: 0
• Mutable & Immutable System.StringBuilder is mutable where variety of operations can be performed System.String is immutable variable value may change BUT original data value will be discarded and new value will be in memory.

#304413 Author: pandikumar Member Level: Bronze Member Rank: 0 Date: 07/Oct/2008 Rating: Points: 1
Simply says Mutable is liable to change Immutable is not liable to change...

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