使用staruml学习画类图

//这是startuml 把uml 转换成的java代码：

public class Circle implements Ishape {
    private double _radius;
    public double getArea() {

    }

    public double getArea();
}

public class Pizza implements Ishape {
    private double price;
    private Ishape _shape;
    public double getprice() {

    }

    public Ishape getshape() {

    }

    public double Pizza() {

    }

    public double getArea();
}

public class Rectangle implements Ishape {
    private double _width;
    private Object _height;
    public double getArea() {

    }

    public double getArea();
}

public interface Ishape {
    public abstract double getArea();
}

下面是关系图: