Question

Question 1: 1. Create a new project in Eclipse (File > New > Java Project.) Name it Homework2Q1 2. Create a package for your classes 3. Create an abstract superclass with only non default constructor(s) 4. Create two different subclasses of that superclass 5. Create another class that is not related (you need a total of four classes up to this point) 6. Create an interface 7. Make the class you did in step 5 and one of the subclasses you did in Step 4 implement the interface 8. Create a runner that: a. Creates an array of the abstract superclass. Make the array elements a mix of the two subclasses b. Create another array of the interface. Make the array elements a mix of the two classes that 1/3 implement it. C. For both arrays, make a for loop that will count how many objects of each type are within. So for example, if an array of Fruits has only Oranges and Apples, your program should count how many apples and oranges are in this array d. Do the same for the second array 9. Be Creative! Avoid classes such as Soccer Match, BankAccount, Fruits and Oranges.

plz write if it is in another class or package

Answer 1

Note:

I developed 2 classes whhich extends abstract class and two class which implements interface.

Could you plz go through this code and let me know if u need any changes in this.Thank You
=================================

// GeometricFigure.java

public interface GeometricFigure {
   double getArea();
  
}

================================

// Figure.java

public abstract class Figure {
private double height;
private double width;
  
/**
* @param height
* @param width
*/
public Figure(double height,double width) {
this.height = height;
this.width = width;
}
  
/**
* @return the height
*/
public double getHeight() {
return height;
}

/**
* @param height the height to set
*/
public void setHeight(double height) {
this.height = height;
}

/**
* @return the width
*/
public double getWidth() {
return width;
}

/**
* @param width the width to set
*/
public void setWidth(double width) {
this.width = width;
}
  
public abstract double calcPerimeter();
  
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return "with height = " + height + " and with width = " + width;
}

}

==================================

// Rectangle.java

public class Rectangle extends Figure {

   public Rectangle(double height, double width) {
       super(height, width);
   }

   @Override
   public double calcPerimeter() {
       return 2 * (getWidth() + getHeight());
   }

   /* (non-Javadoc)
   * @see java.lang.Object#toString()
   */
   @Override
   public String toString() {
       return "Rectangle with "+super.toString();
   }

  
}

=====================================

// Triangle.java

public class Triangle extends Figure implements GeometricFigure {
  
   public Triangle(double height, double width) {
       super(height, width);
   }

   @Override
   public double getArea() {
       double area=0.5*getWidth()*getHeight();
       return area;
   }

   @Override
   public double calcPerimeter() {
       double hyp=Math.sqrt(getHeight()*getHeight()+getWidth()*getWidth());
       double perimeter=getHeight()+getWidth()+hyp;
       return perimeter;
   }

   /* (non-Javadoc)
   * @see java.lang.Object#toString()
   */
   @Override
   public String toString() {
       return "Triangle with "+super.toString();
   }
  

}

===================================

// Circle.java

public class Circle implements GeometricFigure {

   private double radius;

   /**
   * @param radius
   */
   public Circle(double radius) {
       super();
       this.radius = radius;
   }

   /**
   * @return the radius
   */
   public double getRadius() {
       return radius;
   }

   /**
   * @param radius
   * the radius to set
   */
   public void setRadius(double radius) {
       this.radius = radius;
   }

   @Override
   public double getArea() {
       double area = Math.PI * radius * radius;
       return area;
   }

   /* (non-Javadoc)
   * @see java.lang.Object#toString()
   */
   @Override
   public String toString() {
       return "Circle With Radius :"+radius;
   }
  

}

====================================

// Test.java

public class Test {

   public static void main(String[] args) {
  
       Figure gf[]={new Rectangle(4, 5),new Triangle(10, 4),new Rectangle(6, 8),new Triangle(6,4)};
       for(int i=0;i<gf.length;i++)
       {
           System.out.println(gf[i]+" Its Perimeter :"+gf[i].calcPerimeter());
           System.out.println("-------------------------------------------");
       }

      
       GeometricFigure f[]={new Triangle(10, 6),new Circle(3.5),new Triangle(8, 4),new Circle(5.5)};
       for(int i=0;i<gf.length;i++)
       {
           System.out.println(f[i]+" Its Area :"+f[i].getArea());
           System.out.println("-------------------------------------------");
       }
      
   }

}

===================================

output:

Rectangle with with height = 4.0 and with width = 5.0 Its Perimeter :18.0
-------------------------------------------
Triangle with with height = 10.0 and with width = 4.0 Its Perimeter :24.77032961426901
-------------------------------------------
Rectangle with with height = 6.0 and with width = 8.0 Its Perimeter :28.0
-------------------------------------------
Triangle with with height = 6.0 and with width = 4.0 Its Perimeter :17.21110255092798
-------------------------------------------
Triangle with with height = 10.0 and with width = 6.0 Its Area :30.0
-------------------------------------------
Circle With Radius :3.5 Its Area :38.48451000647496
-------------------------------------------
Triangle with with height = 8.0 and with width = 4.0 Its Area :16.0
-------------------------------------------
Circle With Radius :5.5 Its Area :95.03317777109123
-------------------------------------------

=====================Could you plz rate me well.Thank You