Answer:
I've included in the codes the area to circle and volume to cylinder. The Volume method that was used, area() to compute, the volume of cylinder which shows that cylinder is an expansion of circle with an extra dimension (height)
Explanation:
Temp is tester class
public class Temp {
public static void main(String[] args) {
Circle c = new Circle(7);
System.out.println("Area of circle with radius 7 is "+c.area());
Cylinder c1 = new Cylinder(7,10);
System.out.println("Cylinder volume with radius 7 and height 10: "+c1.volume());
}
}
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class Circle{
int radius;
Circle(int r){
radius=r;
}
double area(){ //area of circle
return 3.14*radius*radius;
}
public int getRadius() {
return radius;
}
public void setRadius(int radius) {
this.radius = radius;
}
}
class Cylinder extends Circle{
int height;
Cylinder(int r, int h){
super(r);
height=h;
}
double volume(){ //volume of cylinder
return area()*height;
}
public int getHeight() { //accessor
return height;
}
public void setHeight(int height) { //mutator
this.height = height;
}
}
