使用staruml學習畫類圖

//這是startuml 把uml 轉換成的java代碼：

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();
}

下面是關系圖: