jlab0401_4.java

java教程中的编程实例

class JLab0401_4{
    public static void main(String[] args){
           Rectangle rect=new Rectangle();
           rect.setwidth(3.6);
           rect.setlength(10.8);
          System.out.println("My rectangle has length "+rect.length);
          System.out.println("My rectangle has wideth "+rect.width);
          System.out.println("My rectangle has area   "+rect.area());
}
}
class Rectangle{
       double width,length;
       public Rectangle(){ }
       public Rectangle(double x,double y){
               width=x;
               length=y;
               }
        public double area(){
               double a;
               a=length*width;
               return a;
                           }
        public void setwidth(double x)
               {
               width=x;
                          }
        public void setlength(double x)
           {
              length=x;
             }
}