Mistake in book

[chetan deol]

Hello all ,

Is there any mistake in K&S book for strings .It is written that StringBuilders insert method is zero index based but it is not zero based it is 1 based.

Please refer chapter 6 for this one.



Let me know if its my mistake while reading

[Ankit Garg]

chetan just try this program and justify that insert method uses zero or one based index

class StringBuilderTry
{
	public static void main(String[] args)
	{
		StringBuilder str = new StringBuilder("01234");
		str.insert(2,"hello");
		System.out.println(str);
	}
}

[chetan deol]

I know that its is 1 based but read the book carefully.It is written that the index is zero based.


Thanks

[M Srilatha]

Hi,

Why are you thinking that its 1 based?
StringBuilder's insert method uses zero based index.

If we take the above example, the result would be 01hello234.
When we call insert(2,"hello") on str, it inserts "hello" at index 2(means 3rd character).

Refer to the Java API documentation for more information!

[Angelika Angley]

In a subtitle "Important methods in the StringBuffer and StringBuilder Classes":

under method delete() I found:
"...The starting index of the SUBSTRING to be removed is defined by the first argument (which is zero-based), and the ending index of the substring to be removed is defined by the second argument (but it is one-based)!..."

under method insert():
"...the offset is zero-based..."

Or is there any other places you saw that?
And I'm glad you asked it, cause I thought that StringBuffer/Builder is zero-based after I read the chapter (don't know why).

[Ankit Garg]

chetan dhumane wrote:I know that its is 1 based but read the book carefully.It is written that the index is zero based.

Hey I never said that its one based index . I gave the example to show that it is based on zero based index. Just read how indexing should be looked at here...

[sharon daze]

Yes thanks for your suggestion.

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[Jia Tan]

For String/StringBuilder/StringBuffer functions, can we say index parameter are all 0-based, but the first index will always be inclusive, and the second index(if present) are always exclusive?

[Ruben Soto]

Jia Tan wrote:For String/StringBuilder/StringBuffer functions, can we say index parameter are all 0-based, but the first index will always be inclusive, and the second index(if present) are always exclusive?

Jia, that's exactly the way I think about it, and I think it's the most logical and easiest way to remember how it works.