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能将程序补充完整的选项是 class Person { private int a; public int change(int m){return m; } } public class Teacher extends Person { public int b; public static void main(String arg[]) { Person p=new Person(); Teacher t=new Teacher(); int i; ______ } }

单选题
2022-01-10 22:52
A、i=m
B、i=b
C、i=p.a
D、i=p.change(50)
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正确答案
D

试题解析
解析:本题考查类的声明。选项A中m没有被声明过,不能使用;选项B中虽然b是类Teacher的public成员变量,但在静态方法中,不能使用类中的非静态成员;选项C中a是类Person的private成员,在类外不能直接引用;选项D中change(int m)方法是public方法,并且返回一个int型值,可以通过类的实例变量p引用并赋值给一个int型变量。

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{
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}
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