java类的学习（1）

java 学习编写对象之间调用创建

class Circle{    double radius;    public double findArea(){        return Math.PI * radius * radius;    }    public void setRadius(double r){        radius = r;    }    public double getRadius(){        return radius;    }}public class passobject {    public int printAreas(Circle c, int time){        System.out.println("Radius"+"\t\t"+"Area");        int temp = 1;        while (temp <= time){            c.setRadius(time);            System.out.println( temp+"\t\t"+c.findArea());            temp++;        }        return temp;    }    public static void main(String[] args) {        passobject p = new passobject();       int i = p.printAreas(new Circle(),5);        System.out.println("now radius is "+(double)i);    }}