class Base {}
class Sub extends Base {}
class Sub2 extends Base {}
public class CEx{
public static void main(String argv[]){
Base b = new Base();
Sub s = (Sub) b;
}
}
...全文
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基础问题,帮忙看一下,为什么编译可以过,而运行会错呢,在线等......
class Base {} class Sub extends Base {} class Sub2 extends Base {} public class CEx{ public static void main(String argv[]){ Base b = new Base(); Sub s = (Sub) b; } }