java作业之用内部类求矩形面积2011/9/12
import java.util.Scanner;
public class RectangleArea {
private double width;
private double height;
//构造函数
public RectangleArea(double w,double h)
{
this.width=w;
this.height=h;
}
//内部类
public class AreaTester{
public double area()
{
return width*height;
}
}
public String toString()
{
return width+" "+height;
}
public static void main(String args[])
{
RectangleArea r=new RectangleArea(0,0);//定义原始值为0,0
AreaTester area= r.new AreaTester();//生成内部类的对象
Scanner reader=new Scanner(System.in);
System.out.println("亲,请输入矩形的宽和高,并用回车隔开");
r.width=reader.nextDouble();//读出width的值并检查是否还有下一个输入
r.height=reader.nextDouble();
System.out.println("矩形的面积为:"+area.area());
}
}
运行结果:
亲,请输入矩形的宽和高,并用回车隔开
60 80
矩形的面积为:4800.0