java程序作业问题

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class TestCount {
public double count(double r)
{
return (4/3)*Math.PI*Math.pow(r, 3);
}
public static void main(String[] args) throws NumberFormatException, IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
TestCount t=new TestCount();
System.out.println("请输入半径r：");
Double result=t.count(Double.parseDouble(br.readLine()));
System.out.println("圆球体积:"+result);
}
}

public class Area {
public double area(double r){
double s=4*(Math.PI)*Math.pow(r, 3)/3;
return s;
}
public static void main(String[] args) {
Area a=new Area();
System.out.println(a.area(2));
}
}
这样？

都有公式还不会做呀？自己想吧！不能全抄代码，哪怕你说你哪不会我们都可以帮你！不可能全都不会吧！