public class ClientB
{
  public ClientB()
  {
  }
  
  public static void main(String args[])
  {
    DrawPane pane = new DrawPane();
    LineShape line = new LineShape();
    CircularShape circular = new CircularShape();
    QuadrateShape quadrate = new QuadrateShape();
  
    pane.drawObject(line);
    pane.drawObject(circular);
    pane.drawObject(quadrate);
      
  }

}

interface ShapeObject
{
  public String getShape();
  public void draw();
}

class DrawPane
{ 
    java.util.ArrayList shapeList = new java.util.ArrayList();
    
    public void drawObject(ShapeObject so)
    {
       shapeList.add(so);
       this.repaint(); 
       System.out.println("--------------------------");      
    }
    
    public void repaint()
    {      
      for(int i=0;i<shapeList.size();i++)
      {
        System.out.print(i+":");
        ((ShapeObject)shapeList.get(i)).draw();
      }
      
    }
    
}

 class LineShape implements ShapeObject 
 {
    public String getShape()
    {
       return "画线";
    }
    public void draw()
    {
       System.out.println(this.getShape());
    }
 }
 
 class CircularShape implements ShapeObject
 {
   public String getShape()
   {
     return "画圆";
   }
 
   public void draw()
   {
     System.out.println(this.getShape());
   }
 
 }
 
 class QuadrateShape implements ShapeObject
 {
   public String getShape()
   {
     return "画方";
   }
 
   public void draw()
   {
     System.out.println(this.getShape());
   }