Is the immutability of Strings taken into account in the Java implementation of

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Because Strings in Java are immutable, I’ve always concatenated them using StringBuilder or StringBuffer. Is the String.format() function as capable as StringBuilder or StringBuffer in this regard? To put it another way, does String.format() handle memory in the same way as StringBuffer or StringBuilder do?

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In the sense that it is will produce the same output, String.format() is as capable as StringBuilder/StringBuffer, but StringBuilder/StringBuffer are much more efficient than String.format(), probably because String.format() is having to parse your string.

So, if you have to choose just between the two then I would say that the general rule I would use is to use StringBuilder/StringBuffer where performance is more important, and String.format() where neatness of code is more important.

However, I think the better solution would be to use the string concatenation operator (IE. string1 + string2), which is literally just shorthand for StringBuilder/StringBuffer (and is thus just as fast), and, in my personal opinion, looks just as neat as String.format().

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Mobo01

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