Создать классы Circle и Sphere с методами вычисления площади и объема

/* package whatever; // don't place package name! */
 
import java.util.*;
 
import java.lang.*;
 
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
 
class Ideone
 
{
 
public static void main (String[] args) throws java.lang.Exception
 
{
 
Point2D a = new Point2D(0,0);
 
Point2D b = new Point2D(0,10);
 
Point2D c = new Point2D(0,5);
 
Triangle t = new Triangle2D(a,b,c);
 
System.out.println("AB = " + ((Triangle3D)t).length(a,b));
 
//System.out.println("BC = " + t.length(b,c));
 
//System.out.println("AC = " + t.length(a,c));
 
System.out.println("t is triangle = " + t.isTriangle());
 
Point3D aa = new Point3D(0,0,0);
 
Point3D bb = new Point3D(0,10,3);
 
Point3D cc = new Point3D(0,5,5);
 
Triangle tt = new Triangle3D(aa,bb,cc);
 
try{
 
System.out.println("AB = " + ((Triangle2D)tt).length(aa,bb));
 
} catch (Exception exc){
 
System.out.println(exc.getMessage());
 
}
 
//System.out.println("BC = " + tt.length(bb,cc));
 
//System.out.println("AC = " + tt.length(aa,cc));
 
System.out.println("t is triangle = " + tt.isTriangle());
 
}
 
}
 
class Point2D{
 
int x;
 
int y;
 
Point2D(int a, int b){
 
x = a;
 
y = b;
 
}
 
}
 
class Point3D extends Point2D{
 
int z;
 
Point3D(int a, int b, int c){
 
super(a,b);
 
z = c;
 
}
 
}
 
interface Triangle{
 
double perimeter();
 
boolean isTriangle();
 
}
 
class Triangle2D implements Triangle{
 
Point2D a;
 
Point2D b;
 
Point2D c;
 
Triangle2D(Point2D a, Point2D b, Point2D c){
 
this.a = a;
 
this.b = b;
 
this.c = c;
 
}
 
public boolean isTriangle(){
 
double ab = length(a,b);
 
double ac = length(a,c);
 
double bc = length(b,c);
 
return ab+ac>bc && ab+bc>ac && ac+bc>ab;
 
}
 
public double perimeter(){
 
double ab = length(a,b);
 
double ac = length(a,c);
 
double bc = length(b,c);
 
return ab+ac+bc;
 
}
 
double length(Point2D a, Point2D b){
 
return Math.sqrt(Math.pow(b.x - a.x, 2) + Math.pow(b.y - a.y, 2));
 
}
 
}
 
class Triangle3D implements Triangle{
 
Point3D a;
 
Point3D b;
 
Point3D c;
 
Triangle3D(Point3D a, Point3D b, Point3D c){
 
this.a = a;
 
this.b = b;
 
this.c = c;
 
}
 
public boolean isTriangle(){
 
double ab = length(a,b);
 
double ac = length(a,c);
 
double bc = length(b,c);
 
return ab+ac>bc && ab+bc>ac && ac+bc>ab;
 
}
 
public double perimeter(){
 
double ab = length(a,b);
 
double ac = length(a,c);
 
double bc = length(b,c);
 
return ab+ac+bc;
 
}
 
double length(Point3D a, Point3D b){
 
return Math.sqrt(Math.pow(b.x - a.x, 2) +
 
Math.pow(b.y - a.y, 2) +
 
Math.pow(b.z - a.z, 2));
 
}
 
}