1Objective Implement javautilComparator to determine the ord

(1)Objective: Implement java.util.Comparator to determine the order of arbitrary objects. (1 points)

Write a java program to determine the order of two shape objects by comparing their area.

For example: determine the order of

(a)A 20x5 rectangular.

(b)A circle with radius 6.

Download Circle.java, Rectangular.java and Shape.java

Codes:

//********************************************************************
// Circle.java
//
//********************************************************************

import java.text.*;

public class Circle extends Shape
{
private int radius, x, y;

//-----------------------------------------------------------------
// Constructor: Sets up this circle with the specified values.
//-----------------------------------------------------------------
public Circle (int size)
{
radius = size;

}
//-----------------------------------------------------------------
// Diameter mutator.
//-----------------------------------------------------------------
public void setRadius (int size)
{
radius = size;
}

//-----------------------------------------------------------------
// Diameter accessor.
//-----------------------------------------------------------------
public int getRadius ()
{
return radius;
}

//---------------------------------------------------------------------------
// Returns the calculated value of the area.
//---------------------------------------------------------------------------

public double computeArea()
{
return 3.1416*(radius)*(radius);
}

//---------------------------------------------------------------------------
// Returns the calculated value of the perimeter.
//---------------------------------------------------------------------------

public double computePerimeter()
{
return 3.1416 * 2 * radius;
}

}

//******************************************************************************
// Rectangle.java Author: Lewis/Loftus
//
// Solution to Programming Project 9.11
//******************************************************************************

import java.text.*;

public class Rectangle extends Shape
{
protected double width;
protected double length;
protected static DecimalFormat form = new DecimalFormat(\"0.##\");

//---------------------------------------------------------------------------
// Sets up the rectangle by entering its width and length.
//---------------------------------------------------------------------------
public Rectangle(double wid, double len)
{
width = wid;
length = len;
}

//---------------------------------------------------------------------------
// Returns the double value of the width.
//---------------------------------------------------------------------------
public double getWidth()
{
return width;
}
  
//---------------------------------------------------------------------------
// Returns the double value of the length.
//---------------------------------------------------------------------------
public double getLength()
{
return length;
}

//---------------------------------------------------------------------------
// Returns the calculated value of the area.
//---------------------------------------------------------------------------
public double computeArea()
{
return length * width;
}

  

//---------------------------------------------------------------------------
// Returns the calculated value of the perimeter.
//---------------------------------------------------------------------------
public double computePerimeter()
{
return 2 * (length + width);
}

//---------------------------------------------------------------------------
// Returns pertinent information about the rectangle.
//---------------------------------------------------------------------------
public String toString()
{
return \"Rectangle: width is \" + form.format(width) +
\", length is \" + form.format(length) +
\"\ perimeter is \" + form.format(computePerimeter()) +
\", area is \" + form.format(computeArea());
}
}

//******************************************************************************
// Shape.java   
//
//******************************************************************************

public abstract class Shape
{
abstract public double computeArea();
abstract public double computePerimeter();
}

Solution

//******************************************************************************
//Shape.java   
//
//******************************************************************************

public abstract class Shape implements Comparable<Shape> {
   abstract public double computeArea();

   abstract public double computePerimeter();

   /*
   * two shape objects by comparing their area
   * (non-Javadoc)
   *
   * @see java.lang.Comparable#compareTo(java.lang.Object)
   */
   @Override
   public int compareTo(Shape o) {
       // TODO Auto-generated method stub
       if (this.computeArea() > o.computeArea())
           return 1;
       else
           return 0;
   }
}

//********************************************************************
// Circle.java
//
//********************************************************************
import java.text.*;

public class Circle extends Shape {
   private int radius, x, y;
   protected static DecimalFormat form = new DecimalFormat(\"0.##\");

   // -----------------------------------------------------------------
   // Constructor: Sets up this circle with the specified values.
   // -----------------------------------------------------------------
   public Circle(int size) {
       radius = size;

   }

   // -----------------------------------------------------------------
   // Diameter mutator.
   // -----------------------------------------------------------------
   public void setRadius(int size) {
       radius = size;
   }

   // -----------------------------------------------------------------
   // Diameter accessor.
   // -----------------------------------------------------------------
   public int getRadius() {
       return radius;
   }

   // ---------------------------------------------------------------------------
   // Returns the calculated value of the area.
   // ---------------------------------------------------------------------------

   public double computeArea() {
       return 3.1416 * (radius) * (radius);
   }

   // ---------------------------------------------------------------------------
   // Returns the calculated value of the perimeter.
   // ---------------------------------------------------------------------------
   public double computePerimeter() {
       return 3.1416 * 2 * radius;
   }

   public String toString() {
       return \"\ Circle: radius is \" + radius + \", \ perimeter is \"
               + form.format(computePerimeter()) + \", area is \"
               + form.format(computeArea());
   }

}

//******************************************************************************
//Rectangle.java Author: Lewis/Loftus
//
//Solution to Programming Project 9.11
//******************************************************************************
import java.text.*;

public class Rectangle extends Shape {
   protected double width;
   protected double length;
   protected static DecimalFormat form = new DecimalFormat(\"0.##\");

   // ---------------------------------------------------------------------------
   // Sets up the rectangle by entering its width and length.
   // ---------------------------------------------------------------------------
   public Rectangle(double wid, double len) {
       width = wid;
       length = len;
   }

   // ---------------------------------------------------------------------------
   // Returns the double value of the width.
   // ---------------------------------------------------------------------------
   public double getWidth() {
       return width;
   }

   // ---------------------------------------------------------------------------
   // Returns the double value of the length.
   // ---------------------------------------------------------------------------
   public double getLength() {
       return length;
   }

   // ---------------------------------------------------------------------------
   // Returns the calculated value of the area.
   // ---------------------------------------------------------------------------
   public double computeArea() {
       return length * width;
   }

   // ---------------------------------------------------------------------------
   // Returns the calculated value of the perimeter.
   // ---------------------------------------------------------------------------
   public double computePerimeter() {
       return 2 * (length + width);
   }

   // ---------------------------------------------------------------------------
   // Returns pertinent information about the rectangle.
   // ---------------------------------------------------------------------------
   public String toString() {
       return \"\ Rectangle: width is \" + form.format(width) + \", length is \"
               + form.format(length) + \"\ perimeter is \"
               + form.format(computePerimeter()) + \", area is \"
               + form.format(computeArea());
   }

}

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class TestShape {

   /**
   * @param args
   */
   public static void main(String[] args) {

       List<Shape> shapes = new ArrayList<Shape>();
       shapes.add(new Circle(6));
       shapes.add(new Rectangle(20, 5));
       Collections.sort(shapes);
       // sorted according to two shape objects by comparing their area
       System.out.println(shapes);

   }
}
OUTPUT:
[Rectangle: width is 20, length is 5
perimeter is 50, area is 100,
Circle: radius is 6,
perimeter is 37.7, area is 113.1]