面向对象（进阶）继承性 例题

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父类

package mianxiangduixiang02;public class Circle05 {private double radius;public Circle05(){this.radius=1;}public double getRadius() {return radius;}public void setRadius(double radius) {this.radius = radius;}public double findArea(){return 3.14*radius*radius;}
}

子类 

package mianxiangduixiang02;public class Cylinder05 extends Circle05{private double length;public Cylinder05(){length=1;}public double getLength() {return length;}public void setLength(double length) {this.length = length;}public double findVolumn(){return findArea()*length;}
}

测试

package mianxiangduixiang02;public class CylinderTest05 {public static void main(String[] args) {Cylinder05 c1=new Cylinder05();c1.setLength(2.5);c1.setRadius(2.5);System.out.println(c1.findVolumn());System.out.println("底面面积为"+c1.findArea());}}

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