单选题Which statements, when inserted at the indicated position in the following code, will cause a runtime exception when attempting to run the program?()   class A {}   class B extends A {}   class C extends A {}   public class Q3ae4 {   public static void

题目
单选题
Which statements, when inserted at the indicated position in the following code, will cause a runtime exception when attempting to run the program?()   class A {}   class B extends A {}   class C extends A {}   public class Q3ae4 {   public static void main(String args[]) {   A x = new A();   B y = new B();   C z = new C();   // insert statement here   }   }
A

x = y;

B

z = x;

C

y = (B) x;

D

z = (C) y;

E

y = (A) y;

参考答案和解析
正确答案: C
解析: 暂无解析
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