创建的产品对象需要实现 Shape 接口

public class Circle implements Shape{

private int xPos,yPos;

private int radius;

public Circle(int xPos, int yPos, int radius) {

this.xPos = xPos;

this.yPos = yPos;

this.radius = radius;

System.out.println("Circle 构造器");

}

@Override

public void draw() {

System.out.println("绘制 Circle");

}

@Override

public void fillColor() {

System.out.println("填充 Circle 颜色");

}

}