Given class B, C, D and E below, what gets printed after executing the following

Question

Given class B, C, D and E below, what gets printed after executing the following line of code: B b = new B (): a. C: 40 D: 29 b. C: 38 D: 40 c. C: 12 D: 35 d. None of the above Answer: class E { private int age -12: protected float amount = 35: public String toString() { return "E";} public int getAge{ } { return age: } public void updateAmount (float f) { amount = f: } public void updateAge(int i) (age = i: } } class D extends E (public D() super (): updateAmount(28): } public String toString() (return "D: " + (amount + getAge()): } } Class C extends D { public C() {

Explanation / Answer

Answer: b) C:38 D:40

Explanation:

1)Lets see how object C is constructed

a) first E is initiated.

   Result: age=12 and amount=35

   b) Then D is initiated. updateAmount(28) in D constructor is called.

   Result: age=12 and amount=28

c) finally updateAge(10) in C constructor is called

   Result:age=10 and amount=28

   Therefore: C:38 (10+28)

2) Now lets see how object D is constructed

a) first E is initiated

   Result:age=12and amount=35

b)then updateAmount(28) in D constructor is called.

   Result: age=12 and amount=28

  Therefore D:40 (12+28)

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