为了100分
//抽象类
public abstract class Container {
protected double r;
public double getR() {
return r;
}
public void setR(double r) {
this.r = r;
}
abstract double volume();
}
//立方体
public class Cube extends Container{
double volume() {
return Math.pow(r, 3);
}
}
//球体
public class Sphere extends Container{
double volume() {
return Math.PI * Math.pow(r, 3) * 4 / 3;
}
}
//Tiji
public class Tiji {
public static void main(String[] args) {
Cube cube = new Cube();
cube.setR(4);
System.out.println("立方体体积" + cube.volume());
Sphere sphere = new Sphere();
sphere.setR(3);
System.out.println("球体体积：" + sphere.volume());
}
}
