题目内容

{若有泛型类的定义,下面声明创建该类对象的语句正确的是( )class Demo {Demo(T a){};}}

A. Demo d = new Demo(1);
B. Demo d = new Demo(1);
C. Demo d = new Demo(1);
Demo d = new Demo(”2”);

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{下面程序编译运行的结果是( )class Demo {void setData(T a){System.out.print(a);};}public class Demo2015 {public static void main(String[]a){Demo d = new Demo();d.setData("a");d.setData(1);}}}

A. a
B. 1
C. a1
D. 编译错误

若有定义class Father{},下面继承方式错误的是( )

A. class Son extends Father
B. class Son extends Father
C. class Son extends Father
D. class Son extends Father

{在【1】~【4】处填写适当代码,使程序完整。class 【1】{【2】;int number;public void setData(int number,T a){this.number = number;this.a = a;}public int getNumber(){return number;}public 【3】{return a;}}public class Demo{public static void main(String[] args) {Data data = 【4】;data.setData(1, 90);System.out.println(data.getNumber()+":"+data.getA());}}}

We dashed to the bus station and barely got on the bus when it __________.