error-handling - 模糊的 JAVA 接口(interface)

Question

您如何定义类/接口(interface) Adult、Student 和 Engineer，以便下一个序列仅在指定的地方给出编译错误？

class Test {
public static void main(String args[]) {
Adult a = new Student(); //without giving compilation error
Adult b = new Engineer();//without giving compilation error
a.explorare(); //without giving compilation error
b.explorare(); //without giving compilation error
a.afisare(); //without giving compilation error
b.afisare(); //compilation error

Answer 1

这是不可能的，如果 a.afisare()编译然后应该b.afisare() .