Enthuware

This question asks about emptying the contents of a StringBuilder called sb. The answer I chose is "wrong", but I tried the code and it works:
sb.delete(0,sb.length());

The "right" answer is:
sb.clear();

Why isn't sb.delete(0,sb.length()) correct also?

I appreciate any clarification on this. Thank you so much!

I see that option 1 i.e. sb.delete(0,sb.length()) is indeed set as the correct answer. sb.clear() is incorrect.

It's really wierd that delete() method doesn't throw an IndexOutOfBound error when we pass a value exceeding length of characters in StringBuilder. Like sb.delete(0,10000000) //compiles and runs without any issues..

I think that clear() is for ArrayList and for the StringBuilder you can use delete()