例4-1.txt

这是一本java基础教程 对新手上路有很大帮助

class Lader{
    double above,bottom,height;
    Lader(){}
    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 Example4_1{
  public static void main(String args[]){
       double area1=0,area2=0;
       Lader laderOne,laderTwo;
       laderOne=new Lader();
       laderTwo=new Lader(10,88,20);
       laderOne.setAbove(16);
       laderOne.setBottom(26);
       laderOne.setHeight(100);
       laderTwo.setAbove(300);
       laderTwo.setBottom(500);
       area1=laderOne.computeArea();
       area2=laderTwo.computeArea();
       System.out.println("laderOne的above,bottom和height:"+                                         laderOne.above+","+laderOne.bottom+","+laderOne.height);
       System.out.println("laderOne的面积："+area1);
       System.out.println("laderTwo的above,bottom和height:"+
                       laderTwo.above+","+laderTwo.bottom+","+laderTwo.height);
       System.out.println("laderTwo的面积："+area2);
    }
}