circle.java

高质量Java程序设计 源代码

package net.betterjava.design.inheritance.restriction;

public class Circle extends Ellipse {
	public Circle(Point left, Point right, double d) {
		super(left, right, d);
		assert left.equals(right) == true;
	}

	public Circle(Point focus, double radius) {
		super(focus, focus, radius);
	}

	public static void main(String[] args) {
		Point left = new Point(2.0, 1.0);
		Point right = new Point(2.0, 1.0);
		Circle c = new Circle(left, right, 1.0);
		System.out.println(left.equals(right));
	}
}