定义一个圆类(Circle)，其所在的包为bzu.info.software......

Posted 2020-10-17 呓亿

– 定义一个圆类(Circle)，其所在的包为bzu.info.software；定义一个圆柱类Cylinder，其所在的包为bzu.info.com；定义一个主类A，其所在的包也为bzu.info.com，在A中生成一个Cylinder对象，并输出其体积。编译并运行该类。
– 试着改变求体积方法的访问权限，查看并分析编译和运行结果
– 把Cylinder类和A类置于不同的包中，通过对求体积方法设置不同的访问权限，查看并分析编译和运行结果

 

package bzu.info.software;

public class Circle {

double r,area;
public Circle(double r){
this.r=r;
}
public void setR(double r) {
this.r=r;
}
public double getR() {
return r;
}
public double getArea() {
area=3.14*r*r;
return area;
}
}

 

package bzu.info.com;

import bzu.info.software.Circle;

public class Cylinder {

Circle circle;
double height;
public Circle getCircle() {
return circle;
}
public void setCircle(Circle circle) {
this.circle = circle;
}
double getVolme() {
return circle.getArea()*height;
}
public double getHeight() {
return height;
}
public void setHeight(double height) {
this.height = height;
}
}

package bzu.info.com;

import bzu.info.software.Circle;

public class A {
public static void main(String[] args) {
Cylinder cylinder=new Cylinder();
Circle circle=new Circle(10);
circle.setR(10);
cylinder.setCircle(circle);
cylinder.setHeight(20);
double s=cylinder.getVolme();
System.out.println("底面半径："+circle.getR()+",圆柱的高："
+cylinder.getHeight()+",圆柱的体积："+s);
}
}