Test116 다형성_링크트 리스트

package day09;
// 링크트 리스트 구현 
class ShapeClass {
   ShapeClass next; 
   ShapeClass() { next = null; }
   void draw() {
      System.out.println("shape");
   }
}
class LineClass extends ShapeClass {
   @Override
   public void draw() {
      System.out.println("Line");
   }
}
class RectClass extends ShapeClass {
   @Override
   public void draw() {
      System.out.println("Rect");
   }
}
class CircleClass extends ShapeClass {
   @Override
   public void draw() {
      System.out.println("Circle");
   }
}
public class Test116 {
   public static void main(String[] args) {

      ShapeClass start, last, tmp; 
      
      start = new LineClass(); 
      last = start; 
      tmp = new RectClass(); 
      last.next = tmp; 
      last = tmp; 
      tmp = new LineClass(); 
      last.next = tmp; 
      last = tmp; 
      tmp = new CircleClass(); 
      last.next = tmp; 
      last = tmp; 
      
      // 모든도형 출력 
      ShapeClass s = start; 
      while(s != null) {
         s.draw();
         s = s.next; 
      }
   
   }
}