首页/ 题库 / [单选题]class Animal{ Animal的答案

class Animal{ Animal getOne（）{return new Animal（）；}}   class Dog extends Animal{   //insert code here   }   class AnimalTest{   public static void main（String[] args）{   Animal[] animal={ new Animal（）， new Dog（）}；   for（Animal a：animal）{   Animal x= a.getOne（）；   }   }   }   和代码：   3a.Dog getOne（） { return new Dog（）；}   3b.Animal getOne（） { return new Dog（）；}   第3行中插入的哪项编译且运行无异常？  

单选题
2022-01-10 01:23
A、3a行或3b行
B、既非3a，也非3b
C、3a行
D、3b行
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正确答案
A
试题解析
标签： CMS专题 Java认证考试 Java认证考试综合练习
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class java { 
public static void main（String [] java） {  
for （int Java = 1； Java 〈 java.length； Java++）  
System.out.print（"java "）；  
}  
}  
和命令行： 
java java java java java  
结果为：（）  
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