【单选题】下面程序运行结果正确的是: public class Test{ public static void main(String [] args){ List list=new ArrayList(); list.add("a"); list.add("b"); list.add("a"); Set set=new HashSet(); set.add("a"); set.add("b"); set...
【单选题】下面程序的运行结果是 #include class base { protected: int a public: base(){ cout $amp class basel:virtual base } public: base 1(){cout $amp } class base2:virtual base { public: base2(){cout $amp } class derived...