MysteryClass
-first: int
-second: double;
+MysteryClass()
+MysteryClass(int)
+MysteryClass(double);
+MysteryClass(int, double)
+setData(int, double): void
+getFirst(): int
+getSecond(): double
+doubleFirst(): int
+squareSecond(): double
+print(): void
+equals(MysteryClass): boolean
+makeCopy(MysteryClass): void
+getCopy():MysteryClass
Which of the following would be a default constructor for the class MysteryClass shown in the accompanying figure?
A) public MysteryClass(){ setData(0, 0.0); }
B) public MysteryClass(0, 0.0) { setData(); }
C) public MysteryClass(0) { setData(0, 0.0); }
D) private MysteryClass(10){ setData(); }

Question

Quizplus · Accepted Answer

Option A provides a default constructor that sets the initial values of the instance variables to 0 and 0.0, which is the default value for int and double respectively. This constructor calls the setData method to initialize the instance variables. Hence, option A is the correct choice for a default constructor.

MysteryClass -First: Int