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The primary focus of this assignment is the use of interfaces. In programming, an interface is a public avenue by which data can be accessed and/or manipulated.
five Java classes called Point, Circle, Square, Rectangle, and TestAll, as well as a Java interface called FigureGeometry. The TestAll class should implement the main method which tests all of the other files
Point.java Description:
Instance Variables:
private int width;//stores the width of a Point object private
private int height;//stores the height of a Point object
Constructor: Point()
Parameters:
int theWidth,
int theHeight
Purpose: initializes the width and height of a Point object in the following manner:
width = theWidth;
height = theHeight;
Methods:
public int getWidth(){//returns the width of a Point object in the following manner
return width;}
public int getHeight(){//returns the height of a Point object in the following manner:
return height;}
public void setWidth(int theWidth){//assigns the width of a Point object as follows:
width = theWidth;}
public void setHeight(int theHeight{//assigns the height of a Point object as follows:
height = theHeight;
}
FigureGeometry.java Description:
public interface FigureGeometry{final float PI = 3.14f;
//Classes that implement the FigureGeometry interface MUST override this method which should return the geometric area of a figure:
//In an interface, methods are always public and abstract. Using these unnecessary modifiers is redundant, and future versions of
//Java may not support them.
float getArea ();
//Classes that implement the FigureGeometry interface MUST also override this method which should return the geometric perimeter of a //figure:
float getPerimeter ();}
Circle.java Description:
Instance Variables:
private float radius;//stores the radius of a Circle object
Constructor: Circle()
Parameters:
float theRadius;
Purpose:initializes the radius of a Circle in the following manner:
radius = theRadius;
Methods:
1-public float getRadius(){//returns the radius of a Circle object as follows:
return radius;
}
2-public float getArea(){//returns the area of a Circle object as follows:
return getRadius() * getRadius() * PI;
3-public float getPerimeter(){//returns the perimeter of a Circle object as follows:
return getRadius() * 2 * PI;
}
4-public void setRadius(float theRadius){//assigns the radius of a Circle object as follows:
radius = theRadius;
}
The following coding example illustrates a version of the Circle class:
public class Circle implements FigureGeometry{//Stores the radius of this figure:
private float radius;
//Returns the radius of this figure:
public float getRadius (){return radius;}
//Returns the area of this figure:
public float getArea (){
return getRadius() * getRadius() * PI;}
//Returns the perimeter of this figure:
public float getPerimeter (){ return getRadius() * 2 * PI;}
//Assigns the radius of this figure:
public void setRadius (float theRadius){radius = theRadius;
}
}
Square.java Description:
Instance Variables:
private Point point; //stores the Point of a Square object
Constructor: Square()
Parameters:
Point p;
Purpose:initializes the object point of the Square object in the following manner:
point= p;
Methods:
1-public float getSideLength(){//returns the length of the side of the square as follows:
return point.getWidth();}
2-public float getArea(){//returns the area of a Square object as follows:
return getSideLength() *getSideLength();}
3-public float getPerimeter(){//returns the perimeter of a Square object as follows:
return getSideLength() * 4;}
4-public void setPoint(Point p){//assigns the point of a Square object as follows:
point= p;}
Rectangle.java Description:
Instance Variables:
private Point point;//stores the point of the Rectangle object
Constructor: Rectangle()
Parameters:
Point p;
Purpose: initializes the Point of a Rectangle object in the following manner:
point = p;
Methods:
1-public int getWidth()
{//returns the width of a Rectangle object as follows:
return point.getWidth();}
2-public int getHeight()
{//returns the height of a Rectangle object as follows:
return point.getHeight();}
3-public float getArea()
{//returns the area of a Rectangle object as follows:
return getWidth() * getHeight ();}
4-public float getPerimeter()
{//returns the perimeter of a Rectangle object as follows:
return (getWidth+getHeight()) * 2;}
5-public void setPoint(Point p)
{//assigns the point of a Rectangle object as follows:
point = p;}
TestAll.java Description:
the main method must perform the following tasks:
- an instance of Circle, called c1, with a radius of 5.
- an instance of a Point, called p1, with a side length of 5.
- an instance of a Point, called p2, with a side length of 5 and a side height of 7.
- an instance of a Square, called s1, with a parameter p1.
- an instance of Rectangle, called r1, with a parameter p2.
- Print the radius of c1.
- Print the area of c1.
- Print the perimeter of c1.
- Print the side length of s1.
- Print the area of s1.
- Print the perimeter of s1,
- Print the width of r1.
- Print the height of r1.
- Print the area of r1.
- Print the perimeter of r1.
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