Question

Which of these code segments shows a constructor being used to create a new object?

Rectangle r;
double num = 2.65;
RegularPolygon p = null;
Circle c = new Circle(3.8);
System.out.print("new Rectangle");

Answer 1

The code segment 'Circle c = new Circle(3.8)' shows a constructor being used to create a new object. So, option D is correct.

Step-by-step explanation:

The code segment `Circle c = new Circle(3.8);` demonstrates the use of a constructor to create a new object. In Java, the `new` keyword is followed by the class name (`Circle`), and then a set of parentheses containing arguments for the constructor (`(3.8)` in this case). The constructor is a special method responsible for initializing the object's state when it is created. In the given example, a new `Circle` object is instantiated with a radius of `3.8`.

The object reference `c` now points to this newly created `Circle` instance. Constructors are essential for initializing object properties and ensuring that the object is in a valid state upon creation. The other code segments declare variables and instantiate objects, but the one with `new Circle(3.8)` specifically involves the instantiation and initialization of an object using a constructor.