jlab0401_3.java

java教程中的编程实例

class JLab0401_3{
    public static void main(String[] args){
           Rectangle myRect=new Rectangle(2.5,8.7);
           double theArea;
           theArea=myRect.area();
          System.out.println("My rectangle has length "+myRect.length);
          System.out.println("My rectangle has wideth "+myRect.width);
          System.out.println("My rectangle has area   "+theArea);
}
}
class Rectangle{
       double width,length;
       public Rectangle(double x,double y){
               width=x;
               length=y;
               }
        public double area(){
               double a;
               a=length*width;
               return a;
                           }
}