Exam 1z0-808 topic 1 question 53 discussion

this() and super() cannot both be used in the same constructor call: In a single constructor, you can either call another constructor in the same class using this() or call a constructor in the superclass using super(). You cannot use both of them in a single constructor call.

D is correct

D. Compilation fails at line n2 Code - class Vehicle { int x; Vehicle() { this(10); //line n1 } Vehicle(int x) { this.x=x; } } class Car extends Vehicle { int y; Car() { super(); this(20); //line n2 } Car(int y) { this.y = y; } public String toString() { return super.x+ ":" + this.y; } } public class MyClass { public static void main(String args[]) { Vehicle y = new Car(); System.out.println(y); } }

Correct answer D

D is correct

We can't call Super() and this() simultaneously in constructor.

D is answer. Tested. Output: Exception in thread "main" java.lang.Error: Unresolved compilation problem: Constructor call must be the first statement in a constructor