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GeekInterview.com > Interview Questions > Microsoft > Microsoft.NET
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Question: What is meant by Mutable and Immutable classes?
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| July 07, 2008 11:16:30 |
#5 |
| bobby420 |
Member Since: July 2008 Total Comments: 1 |
RE: What is meant by Mutable and Immutable classes?
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Best Example to understand Mutable and Immutable is string.
string class is immutable.
so if
string x = "123";
if you do x = x + "abc" what it does is it assigns new memory location for 123 and abc.
Then adds the two strings and places the computed results in new memory location and points x to it.
if you use
System.Text.StringBuilder sb = new System.Text.StringBuilder("123");
sb.Append("abc");
x=sb.ToString();
stringbuilder is mutable class. It just adds the string to same memory location.
This way string manipulation is faster.
I hope this helps.
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