How to get character array which is inside StringBuilder to avoid array copy

user_398883 0
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Is there any way by which I can get character array stored inside StringBuilder to avoid creating copy of it when I do toString(). Since, it is a primitive array so it is like deep copy and I would like to avoid generating this garbage.

java string
5 Answers

Avoid doing stringbuilder.toString().toCharArray() as it will allocate the memory twice.

Use something like :

char[] charArray = new char[stringbuilder.length()];
stringbuilder.getChars(0, stringbuilder.length(), charArray, 0);

Using reflection is also a bad idea as it may not be compatible with future java version and you'll have to resize the array as its size is probably bigger than the StringBuilder length see StringBuilder#capacity()

user_22577720

Let us suppose 'str' is an instance of StringBuilder class that holds some string. The simplest way to convert str to char array is as follows:

'str.toString().toCharArray(); '

user_98185250
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