ellipse.java

来自「哈工大实验课源代码」· Java 代码 · 共 29 行

package gg;

public class Ellipse extends Circle{//继承Circle类
	private double a;//声明变量
	private double b;
	public Ellipse(double a, double b) {//构造方法
		super(a);//从父类继承
		this.a = super.getA();//从父类的getA()函数得到a
		this.b = b;
	}
	public double getA() {//读取短a半径
	return a;
	}
	public void setA(double a) {//设置短半径
		this.a = a;
}
	public double getB() {//读取长半径
		return b;
	}
	public void setB(double b) {//设置长半径
		this.b = b;
	}
	public double calculateArea(){//覆盖父类中的calculateArea()方法，计算椭圆的面积
		double area=0;
		area=Math.PI*a*b;
		return area;
	}
}