题目内容

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

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{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());}}}

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