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Write a program named RectangleArea to calculate the area of a rectangle with a length of 15.8 and a width of 7.9. The program should have two classes, one is the RectangleArea holding the Main(), and the other one is Rectangle. The Rectangle class has three members: a property of length, a property of width, and a method with a name of CalArea() to calculate the area. You can invoke the auto-provided constructor or write a self-defined constructor to initialize the rectangle. Calculate and display the area of the rectangle by first initialize an object named myRectangle and then calculate its area using the CalArea() method.

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ijeggs

Answer:

public class RectangleArea {

   public static void main(String[] args) {

       Rectangle myRectangle = new Rectangle(15.8, 7.9);

       double calArea = myRectangle.calcArea(15.8, 7.9);

       System.out.println("The area is "+ calArea);

   }

}

class Rectangle{

   private double length;

   private double width;

   //Defined Constructor

   public Rectangle(double length, double width) {

       this.length = length;

       this.width = width;

   }

   public double calcArea(double len, double wi){

       return len* wi;

   }

}

Explanation:

  • This is solved with Java programming language
  • Start by creating both classes RectangleArea and and Rectangle
  • SInce both classes are in the same file, only one can be public
  • Class Rectangle contains the three members are decribed by the question
  • private double length, private double width and the method calcArea(). It also has a sefl-declared constructor.
  • In the class RectangleArea, an object of Rectangle is created and initialized.
  • The method calcArea is called using the created object and the value is printed.