例4-1.txt

java电子版源码 java电子版源码

class Lader
{
    double above,bottom,height;
    Lader(double a,double b,double h)
    {
        above=a;
        bottom=b;
        height=h;
    }
    public void setAbove(double a)
    {
        above=a;
    }
    public void setBottom(double b)
    {
        bottom=b;
    }
    public void setHeight(double h)
    {
        height=h;
    }
    double computeArea()
    {
        return (above+bottom)*height/2.0;
    }
}
public class Example
{
    public static void main(String args[])
    {
       double area1,area2=0;
       Lader laderOne,laderTwo;
       laderOne=new Lader(5,10,12);
       laderTwo=new Lader(10,20.45,20);
       area1=laderOne.computeArea();
       area2=laderTwo.computeArea();
       System.out.printf("laderOne和laderTwo的面积分别是:%n%f,%f\n",area1,area2);
       laderOne.setAbove(10);
       laderTwo.setBottom(40);
       area1=laderOne.computeArea();
       area2=laderTwo.computeArea();
       System.out.printf("laderOne和laderTwo的面积分别是:%n%f,%f\n",area1,area2);
    }
}