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abstract and interface classes

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tiro john

Posts: 6
Nickname: motiero
Registered: Feb, 2003

abstract and interface classes

Posted: Mar 4, 2003 3:56 PM

please help me to replace the abstract class with interface class in the program below. i dont know the difference between the two.

import java.util.*;
abstract class Shape7
{

// public double shape;

public string name;
public Shape(string name);{
this.name=name;
}
abstract public double area();
abstract public double perimeter();
abstract public String toString();

}

class Circle extends Shape7
{
final double PI=3.1419;
double radius;

public Circle()
{

radius=0.0;
}
public Circle ( double rad )
super(name);

{
radius = rad;
}

public void setradius(double rad)
{
radius=rad;
//return radius;
}
public double getradius(double rad)
{
return radius;
}
public double area()
{
double area=(PI)*(radius)*(radius);
return area;
}
public double perimeter()
{
double perimeter= (2*(PI)*(radius));
return perimeter;
}
public String toString()
{
return("area of a circle:"+area()+" "+"perimeter of your circle:" +perimeter());

}
}
////////////////////////////////////////////////////////////
class Triangle extends Shape7
{
double base;
double height;
double side1;
double side2;

public Triangle()
{
base=0.0;
height=0.0;
side1=0.0;
side2=0.0;
}
public Triangle(double b,double h,double s1,double s2)
super(name);
{
base=b;
height=h;
side1=s1;
side2=s2;
}
public void setbase(double b)
{
base=b;
// return base;
}
public double getbase()
{
return base;
}
public void setheight(double h)
{
height=h;
//return height;
}
public void setside1(double s1)
{
side1=s1;
//return side1;
}
public void setside2(double s2)
{
side2=s2;
// return side2;
}

public double getheight()
{
return height;
}
public double getside1()
{
return side1;
}
public double getside2()
{
return side2;
}
public double area()
{
double area=base*height/2;
return area;
}
public double perimeter()
{
double perimeter=(base+side1+side2);
return perimeter;
}
public String toString()
{
return("area of a triangle:"+area()+" "+"perimeter of my triangle:"+perimeter());
}
}
///////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////
class Rectangle extends Shape7
{
double width;
double length;

public Rectangle()
{
width=0.0;
length=0.0;
}
public Rectangle(double w,double l)
super(name);
{
width=w;
length=l;
}
public void setwidth(double w)
{
width=w;
// return width;
}
public void setlength(double l)
{
length=l;
// return length;
}
public double getwidth()
{
return width;
}
public double getlength()
{
return length;
}
public double area()
{
double area= length * width;
return area;
}
public double perimeter()
{
double perimeter=2*(length+width);
return perimeter;
}
public String toString()
{
return("area of a rectangle:"+area()+" "+"perimeter of your rectangle:"+perimeter());
}
}
///////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////
class Square extends Rectangle
{
//double length=0.0;
public Square(double length)
super(name);
{
super(length,length);
}
public double area()
{
double area= (length*length );
return area;
}
public double perimeter()
{
double perimeter= (4 * length);
return perimeter;
}
public String toString()
{
return("area of a square:"+area()+" "+"perimeter of my square:"+perimeter());
}}
//////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////
class Regularpentagon extends Shape2
{
double base;
double height;
double side;

public Regularpentagon()
{
base=0.0;
height=0.0;
side=0.0;
}
public Regularpentagon(double b,double h,double s)
super(name);
{
base=b;
height=h;
side=s;
}
public void setbase(double b)
{
base=b;
//return base;
}
public double getbase()
{
return base;
}
public void setheight(double h)
{
height=h;
// return height;
}
public double getheight()
{
return height;
}
public void setside(double s)
{
side=s;
//return side;
}
public double getside()
{
return side;
}
public double area()
{
double area=5*(base*height/2);
return area;
}
public double perimeter()
{
double perimeter=5*side;
return perimeter;
}
public String toString()
{
return("area of a regularpentagon:"+area()+" "+"perimeter of my regularpentagon:"+perimeter());
}
}
class TestShape7
{
public static void main(String[]args)
{
try{
//shape[]ss=new shape[10];
Circle ss = new Circle(4.0);
Triangle ss1 = new Triangle(3.0,6.0,9.0,10.0);
Rectangle ss2 = new Rectangle(2.0,4.0);
Square ss3 = new Square(2.0);
Regularpentagon ss4 = new Regularpentagon(5.0,7.0,5.0);

// for(int i=0;i<ss.length;i++)
{
System.out.println(ss.toString());
System.out.println(ss1.toString());
System.out.println(ss2.toString());
System.out.println(ss3.toString());
System.out.println(ss4.toString());
}
}
catch(Exception e)
{
System.out.println(" ");
}
}
}

/////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// ////////////
the two.

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