Question

Your application has a hierarchy of Java classes, with class Person at the top, class Student extending Person, class CollegeStudent extending Student, class TertiaryStudent extending Student, and class Employee extending Person. Given the code fragment below: Person pl = new Person(); Person p2 new Student (); Person p3 new TertiaryStudent (); Person p4 = new College Student (); Person p5 new Employee(); Student si = new Student (); Student s2 = new TertiaryStudent (); Student s3 = new CollegeStudent (); TertiaryStudent ts2 new TertiaryStudent (); CollegeStudent cs2 = new CollegeStudent (); Employee el = new Employee(); College Student c; Which of the following statements would compile successfully and would NOT result in a run-time error?

JAVA

None of the others

c = (CollegeStudent) s1;

c = (CollegeStudent) s3;

c = (CollegeStudent) p2;

c = (CollegeStudent) s2;

c = (CollegeStudent) p5;

is it s3?

Answer 1

Person p1 = new Person();
Person p2 = new Student();
Person p3 = new TertiaryStudent();
Person p4 = new CollegeStudent();
Person p5 = new Employee();

Student s1 = new Student();
Student s2 = new TertiaryStudent();
Student s3 = new CollegeStudent();

TertiaryStudent ts2 = new TertiaryStudent();
CollegeStudent ts2 = new CollegeStudent();
Employee e1 = new Employee();
CollegeStudent c;

According to given program
statement c = (CollegeStudent) s3; will compile successfully.(without any run time error)