哥们在帮我做一个 谢谢了项目二：类与对象项目目的：1. 掌握java类中方法和变量的创建过程。2. 掌握创建对象和对象的

public class Test {
public static void main(String[] args) {
MyPoint circle = new MyCircle(10, 20, 30);
System.out.println("area of circle :" + circle.getArea());

MyPoint sphere = new MySphere(10, 10, 10, 20);
System.out.println("area of sphere :" + sphere.getArea());
}
}
abstract class MyPoint {
public double x, y;
public MyPoint(double x, double y) {
this.x = x;
this.y = y;
}

abstract public double getArea();
}
class MyCircle extends MyPoint {

public double radius;
public MyCircle(double x, double y, double radius) {
super(x, y);
this.radius = radius;
}
@Override
public double getArea() {
return Math.PI * radius * radius;
}
}
class MySphere extends MyPoint {
public double z, radius;
public MySphere(double x, double y, double z, double radius) {
super(x, y);
this.z = z;
this.radius = radius;
}
@Override
public double getArea() {
return 4 * Math.PI * radius * radius;
}
}