String

[Gaurav Pavan Kumar Jain]

Below code is confusing me please help me to understand

Stringbuffer s="123456789"

s.delete(0,3)
s.replace(1,3,"24")

I cannot understand what will be the output

[Lucia Short]

In the code snippet:

StringBuffer s= new StringBuffer("123456789");
s.delete(0,3);
System.out.println(s);
s.replace(1,3,"24");
System.out.println(s);

The output is:
456789
424789

because in both functions delete(int start, int end) and replace(int start, int end), the start index is 0-based, but the end index is 1-based.

[Gaurav Pavan Kumar Jain]

Thank you very much for your help

[Jesper de Jong]

Originally posted by Lucia Short:
...the start index is 0-based, but the end index is 1-based.

That's not the way you should look at it. Look at it this way: Both indices are 0-based, but the begin index is inclusive, and the end index is exclusive.

[Kelvin Chenhao Lim]

Originally posted by Jesper Young:

That's not the way you should look at it. Look at it this way: Both indices are 0-based, but the begin index is inclusive, and the end index is exclusive.

Yeah, this is the only part of K&B that really made me shake my head when I first read it. What were they thinking when they wrote this "end index is 1-based" explanation? Not only is it more confusing than the "end index exclusive" explanation, but the official API documentation itself uses the "end index exclusive" terminology. (Bert, if you're around, I'd love to hear your thoughts on this. )