考虑如下代码:class Tree{}class Pine extends Tree{}class Oak extends Tree{}public class F
考虑如下代码:
class Tree{}
class Pine extends Tree{}
class Oak extends Tree{}
public class Forest {
public static void main(String[] args ) {
Tree tree = new Pine();
if(tree instanceof Pine )
System.out.println("Pine" );
if(tree instanceof Tree )
System.out.println("Tree" );
if(tree instanceof Oak )
System.out.println("Oak" );
else
System.out.println("Oops" );
}
}
则输出结果中有哪些?
A.Pine B.Tree C.Forest D.Oops E.无输出