How does the nsmutablestring class work?

How does the nsmutablestring class work?

The NSMutableString class adds one primitive method— replaceCharacters (in:with:) —to the basic string-handling behavior inherited from NSString. All other methods that modify a string work through this method.

How do you create an immutable string in Java?

To construct and manage an immutable string—or a string that cannot be changed after it has been created—use an object of the NSString class. The NSMutableString class adds one primitive method— replaceCharacters (in:with:) —to the basic string-handling behavior inherited from NSString.

How do you modify a string with no characters?

All other methods that modify a string work through this method. For example, insert (_:at:) simply replaces the characters in a range of 0 length, while deleteCharacters (in:) replaces the characters in a given range with no characters. NSMutableString is “toll-free bridged” with its Core Foundation counterpart, CFMutableString.

How do I override the primitive instance methods of an NSString?

Any subclass of NSString must override the primitive instance methods length and character (at:). These methods must operate on the backing store that you provide for the characters of the string. For this backing store you can use a static array, a dynamically allocated buffer, a standard NSString object, or some other data type or mechanism.

Is it possible to subclass NSString in Java?

It is possible to subclass NSString (and NSMutableString ), but doing so requires providing storage facilities for the string (which is not inherited by subclasses) and implementing two primitive methods.

What is the difference between NSString and CFString?

NSString is toll-free bridged with its Core Foundation counterpart, CFString. See Toll-Free Bridging for more information. An NSString object encodes a Unicode-compliant text string, represented as a sequence of UTF–16 code units.