ClassCastException when running my program

Heres the code for my program is takes in a file which contains data like this.

LINE 250 500 100 100
CIRCLE 50 100 75 77
RECTANGLE 100 40 50 77
END

This part of the program displays correctly. My problem is when using the Line,Circle,Rectangle classes to anchor the shapes onto my GUI correctly.

heres the original question instead of repeating myself.
https://www.experts-exchange.com/questions/20812032/Interface-to-tag-drawable-objects.html

this part causes the problems. Each shape class gives anchor points.

shapelist.add(new Line(10, 10));
shapelist.add(new Circle(50));
shapelist.add(new Rectangle(100, 50));

import java.io.*;
import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
import javax.swing.border.LineBorder;
import java.util.*;

public class Proto1 extends JComponent{

private static final int WIDTH=400;
private static final int HEIGHT=300;
private ArrayList shapelist = new ArrayList();
public Proto1(String filename){

this.setPreferredSize(new Dimension(WIDTH,HEIGHT));
this.setBorder(new LineBorder(Color.red,10));
shapelist.add(new Line(10, 10));
shapelist.add(new Circle(50));
shapelist.add(new Rectangle(100, 50));
try{
String line;
BufferedReader in = new BufferedReader(new FileReader (filename));
while(!(line=in.readLine()).equals("END"))
{
StringTokenizer st = new StringTokenizer(line);
String tok = st.nextToken();
if(tok.equals("LINE"))
{
shapelist.add(new Line2D.Float(
Integer.parseInt(st.nextToken()),
Integer.parseInt(st.nextToken()),
Integer.parseInt(st.nextToken()),
Integer.parseInt(st.nextToken())));
}
else if(tok.equals("CIRCLE"))
{
shapelist.add(new Ellipse2D.Double(
Integer.parseInt(st.nextToken()),
Integer.parseInt(st.nextToken()),
Integer.parseInt(st.nextToken()),
Integer.parseInt(st.nextToken())));
}
else if(tok.equals("RECTANGLE"))
{
shapelist.add(new Rectangle2D.Float(
Integer.parseInt(st.nextToken()),
Integer.parseInt(st.nextToken()),
Integer.parseInt(st.nextToken()),
Integer.parseInt(st.nextToken())));
}

}

in.close();
}
catch(IOException e)
{
System.out.println(e.getMessage());
}
}
public void paintComponent(Graphics g){

super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
for(int i=0;i< shapelist.size();i++)
{
Shape shape = (Shape) shapelist.get(i);
g2.setPaint(Color.blue);
g2.draw(shape);
g2.fill(shape);
repaint();
}
}

public static void main( String [] args ){

JFrame jWindow = new JFrame("Prototype 1");
jWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jWindow.getContentPane().add(new Proto1(args[0]),BorderLayout.CENTER);
jWindow.pack();
jWindow.setVisible(true);
}
}

SHAPE CLASSES

// CIRCLE

import java.awt.geom.*;            // enables use of Line2D
import java.awt.Graphics2D;      // enables use of Graphics2D

class Circle implements Drawable
{
private int x;      // anchor point, x
private int y;      // anchor point, y
private int w;      // width of circle
private int h;      // height of circle
private int r;      // radius of circle

public Circle(int r)
{
this.r = r;      // store the radius value so it can be used in the draw method
w = r*2;  // 2 times the radius gives you the length of the width
h = r*2;  // 2 times the radius gives you the length of the height
}

public void draw(Graphics2D g, int ax, int ay)
{
x = ax-r;          //anchor point - radius to give to give centre at anchor point
y = ay-r;
g.draw(new Ellipse2D.Float(x, y, w, h));
}

public String toString()
{
return "Circle: radius=" + r + " centre points (" + x + "," + y + ")";
}
}

// LINE

import java.awt.geom.*;            // enables use of Line2D
import java.awt.Graphics2D;      // enables use of Graphics2D

class Line implements Drawable
{
private int dx;      // x displacement from the anchor point
private int dy;      // y displacement from the anchor point

public Line(int x, int y)       // anchor point starts at x, y
{
dx = x;
dy = y;
}

public void draw(Graphics2D g, int ax, int ay)
{
g.draw(new Line2D.Float(ax, ay, ax+dx, ay+dy));
}

public String toString()
{
return "Line: x-displacement=" + dx + " y-displacement=" + dy;
}
}

// RECTANGLE

import java.awt.geom.*;            // enables use of Line2D
import java.awt.Graphics2D;      // enables use of Graphics2D

class Rectangle implements Drawable
{
private int w;
private int h;

public Rectangle(int w, int h)
{
this.w =w;
this.h = h;
}

public void draw(Graphics2D g, int x, int y)
{
g.draw(new Rectangle2D.Float(x, y, w, h));
}

public String toString()
{
return "Rectangle: width=" + w + " height=" + h;
}
}

please ask for more code if needed.