Question

8) Which of the following messages passed to the String str could throw a StringIndexOutOfBoundsException?

a) ( )
b) str.charAt(2);
c) str.replace('a', 'A');
d) (str);
e) any of the above could throw a StringIndexOutOfBoundsException

Answer 1

The str.charAt(2) method could throw a StringIndexOutOfBoundsException if the string has fewer than three characters, as it attempts to access an index outside the string's range. The other options would not lead to this particular exception.Therefore, the correct answer is b) str.charAt(2).

Step-by-step explanation:

The message passed to the String str that could throw a StringIndexOutOfBoundsException is b) str.charAt(2);. This exception occurs when an attempt is made to access an index that is either negative, or beyond the range of the string.

If the string str has fewer than 3 characters (i.e., length of 0, 1, or 2), calling str.charAt(2) would cause this exception because the index '2' does not exist.

On the other hand, str.replace('a', 'A') will not cause this exception as it does not involve any indexing operation; it simply replaces occurrences of a character with another character throughout the entire string.

The option (str) and a blank message ( ) are syntactically incorrect for string method calls, so they would not lead to a StringIndexOutOfBoundsException, but would likely lead to a different syntax or compilation error.

Therefore, the correct answer is b) str.charAt(2).