Ambiguos JAVA

[ALINAMARIA]

How can you define the classes Adult, Student and Engineer so that the next sequence to give compilation error only where specified?

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

[pbrockway2]

Double post. Reply here: Ambiguos JAVA

@OP: Please don't post the same question twice.

It might help get more responses if you thought said what aspects of Java you thought might be involved. And why. And what you tried, and what happened when you tried that.