Question

Consider the following class definition.public class Rectangle{private double length;private double width;public Rectangle(double l, double w){length = l;width = w;}public void set(double l, double w){length = l;width = w;}public void print(){System.out.println(length + " " + width);}public double area(){return length * width;}public double perimeter(){return 2 length + 2 width;}}Which of the following statements correctly instantiate the Rectangle object myRectangle?(i) myRectangle Rectangle = new Rectangle(10, 12);(ii) class Rectangle myRectangle = new Rectangle(10, 12);(iii) Rectangle myRectangle = new Rectangle(10, 12);

Answer 1

Answer:

The answer is "option (iii)".

Explanation:

• Instantiation stands for a specific instance creation of model or abstraction. It is also known as object code. In the given question the correct code for instantiating a class in java is option iii because it is the correct format.  

• In this option, we create a class object that is "myRectangle" and call the parameterized constructor by passing value in parameter this process is known as instantiation.

• In instantiation first, we write a class name that is "Rectangle" then create an object that is "myRectangle" and use a new keyword for instantiating an object.
• In option (i) we use the object name first and in option (ii) we use class keyword that's why both options are incorrect.