review21

package pack07;

import java.util.Date;

class Rect{
    double width, height, area;
    public double getArea()
    {
        area = width * height;
        return area;
    }
}

public class Test11 {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        try{
            Class cs = Class.forName("pack07.Rect");
            Rect rect = (Rect)cs.newInstance();//Rect必须有无参构造方法
            rect.width = 100;
            rect.height = 200;
            System.out.println("rect的面积：" + rect.getArea());
            cs = Class.forName("java.util.Date");
            Date date = (Date)cs.newInstance();
            System.out.println(date.toString());
        }
        catch(Exception e)
        {
            System.out.println(e.toString());
        }
    }
}