[OCAJP][OCPJP]字串索引範圍

Given:

public static void main(String[] args) {
    String theString = "Hello World";
    System.out.println(theString.charAt(11));
}

What is the result?

A. The program prints nothing
B.

C. A StringIndexOutOfBoundsException is thrown at runtime.
D. An ArrayIndexOutOfBoundsException is thrown at runtime.
E. A NullPointerException is thrown at runtime.

題解

theString變數所參考到的字串為長度是11的「Hello World」，程式第7行要取得「Hello World」索引位置為11的字元，會超出字串長度，因此會拋出StringIndexOutOfBoundsException例外。