public class Test {
public static void main(String[] args) {
A1 x = new A1();
A2 y = new A2();
A3 z = new A3();
//此处插入一条语句
}
}
下面哪些语句放到以上插入行,将导致运行时异常?
(a) x = y;
(b) z = x;
(c) y = (A2)x;
(d) z = (A3)y;
(e) y = (A1)y;
很基础的一个题,大家来做做看吧~
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一道关于运行时异常的题
对于以下类: class A1 {} class A2 extends A1 {} class A3 extends A1 {} public class Test { public static void main(String[] args) { A1 x = new A1(); A2 y = new A2(); A3 z = new A3(); //此处插入一条语句 } } 下面哪些语句放到以上插入行,将导致运行时异常? (a) x = y; (b) z = x; (c) y = (A2)