class Guy{String greet(){return “hi“}} class Cowboy extends Guy {String greet(){return“howdy”}} class Surfer extends Guy {String greet(){return“dudel”}} class Greetings{ public static void main (string[]args){ Guy[] guy= {new Guy(),new Cowboy(),new Surfer()}; for(Guy 0: guys) System.out.print(g.green()); } } 结果为:
- A运行时异常被输出
- B第7行出现一个错误,编译失败
- C第8行出现一个错误,编译失败
- Dhi hi hi
- Ehi hawdy doude