Can Someone help me with this? I need this example done so I can understand it b
ID: 3555076 • Letter: C
Question
Can Someone help me with this? I need this example done so I can understand it better. Thanks. 5 star rating for helpful and corrct answer.
1) Copy the abstract class GeometricObject below, and save it in the file GeometricObject.java:
public abstract class GeometricObject
{
public abstract double getArea();
public abstract double getPerimeter();
public String toString()
{
return "GeometricObject: Area=?, Perimeter=?";
}
}
2) Write a subclass of GeometricObject called Circle. Save it in the file Circle.java. Include a member variable
for the circle's radius. Include a constructor that takes the radius of the circle as a parameter. Override the
getArea(), getPerimeter() and toString() methods. The toString() method should print out the circle's radius, and
the area and perimeter of the circle. .
Hint: the class should start with
Explanation / Answer
GeometricObject.java
public abstract class GeometricObject
{
public abstract double getArea();
public abstract double getPerimeter();
public String toString()
{
return "GeometricObject: Area=?, Perimeter=?";
}
}
--------------------------------------------------------------------------------------------------------------------
Circle.java.
public class Circle extends GeometricObject
{
double r;
double area;
double perimeter;
Circle(double in){
r=in;
}
public double getArea()
{
area=pi*r2;
}
public double getPerimeter()
{
perimeter=2*pi*r;
}
public string toString()
{System.out.println("Area "+area);
System.out.printf("Perimeter "+perimeter);
}
public static void main(String args[]){
Circle c1=Circle(5.2);
}
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