Q: Assistance in creating a class Rectangle with double attributes length and wi

Question

Q: Assistance in creating a class Rectangle with double attributes length and width. The default constructor should set these attributes to 1. Provide methods that calculate the rectangle's perimeter and area, as well as accessors/getters and mutators/setters for both data fields. The mutator methods for length and width should verify that the number being passed in is larger than 0.0 and less than 20.0 -- if it doesn't fit those criteria, the value of the field should not be changed. Additionally implement two methods called makeCopy() and fromRectangle(). - makeCopy() is class method: takes a rectangle as input parameter and return the copy of that rectangle - fromRectangle() is an instance method that takes a rectangle as input and copies the data attributes of rectangle into the calling object. Write a function called main() in the same file to test your Rectangle class . It should prompt the user to enter a length and width of a rectangle, and then print out the area and perimeter of the rectangle. (Use the mutators to set the length and width of the rectangle, not the constructor .)

Explanation / Answer

Rectangle.java

import java.util.Scanner;

public class Rectangle implements Cloneable{
   //Declaring instance variables
   private double length;
   private double width;
  
   //Zero argumented constructor
   public Rectangle() {
       super();
       this.length=1;
       this.width=1;
   }
  
   //Setters and getters
   public double getLength() {
       return length;
   }
   public void setLength(double length) {
       if(length>0.0 && length<20.0)
       this.length = length;
          
   }
   public double getWidth() {
       return width;
   }
   public void setWidth(double width) {
       if(width>0.0 && width<20.0)
       this.width = width;
   }
  
   //Method which calculates the perimeter of the rectangle
   public double perimeter()
   {
       return 2*(length+width);
   }
   //Method which calculates the area of the rectangle  
   public double area()
   {
       return length*width;
   }
  
   public Rectangle makeCopy(Rectangle rect)
   {
       Rectangle copyr=new Rectangle();
       try {
           copyr=(Rectangle)super.clone();
       } catch (CloneNotSupportedException e) {
           e.printStackTrace();
       }
       return copyr;
   }
   public Rectangle fromRectangle(Rectangle rect)
   {
       Rectangle r=new Rectangle();
       r.length=rect.length;
       r.width=rect.width;
       return r;
   }
   public static void main(String args[])
   {
       double length,width;
      
       //Scanner object is used to get the inputs entered by the user
               Scanner sc=new Scanner(System.in);
              
               //Getting the inputs entered by the user
               System.out.print("Entee the Length :");
               length=sc.nextDouble();
               System.out.print("Entee the Width :");
               width=sc.nextDouble();
              
               //creating the rectangle class object
               Rectangle rect=new Rectangle();
              
               //calling the setter methods on the Rectangle class object
               rect.setLength(length);
               rect.setWidth(width);
              
               //Displaying the area of the Rectangle
               System.out.println("Area of the Rectangle :"+rect.area());
              
               //Displaying the Perimeter of the Rectangle
               System.out.println("Perimeter of the Rectangle :"+rect.perimeter());
              
               Rectangle rect1=rect.makeCopy(rect);
               System.out.println("Perimeter of the Rectangle#1:"+rect1.perimeter());
              
   }
  
}

___________________

Output:

Entee the Length :6.6
Entee the Width :7.7
Area of the Rectangle :50.82
Perimeter of the Rectangle :28.6
Perimeter of the Rectangle#1:28.6

_________________Thank You

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.