笔记

package phoneix.test;


public class Circle {
private double radius;


public Circle() {
radius = 1;
}


public double getRadius() {
return radius;
}


public void setRadius(double radius) {
this.radius = radius;
}


public double findArea(double radius) {
return 3.14 * (radius * radius);
}

}

package phoneix.test;


public class Cylinder extends Circle {
private double length;


public Cylinder() {
length = 1;
}


public double getLength() {
return length;
}


public void setLength(double length) {
this.length = length;
}


public double findVolume(double radius, double length) {
return length * findArea(radius);
}
}

package phoneix.test;


public class Test {


public static void main(String[] args) {
Cylinder c = new Cylinder();
c.setLength(3.14);
c.setRadius(3.14);
System.out.println(c.findArea(c.getLength()));
System.out.println(c.findVolume(c.getRadius(), c.getLength()));


}


}