[OCAJP][OCPJP]當foreach遇到null

Given:

public class MyFor3 {

    public static void main(String[] args) {
        int[] xx = null;
        for (int ii : xx) {
            System.out.println(ii);
        }
    }
}

What is the result?

A.

B. Compilation fails
C. An exception is thrown at runtime
D.

題解

程式會在第5行拋出NullPointerException，因為xx變數的儲存的陣列物件參考是null。