Please help me fix this error: invalid method declaration

[amrmb09]

java:13: invalid method declaration; return type required
public SimpleShape()

import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;
import java.util.*;

public class Graphics2D
{
	public static void main (String[] args) 
	{
		new SimpleShape();
	}
	
    public SimpleShape()
    {
    	this.setSize(300, 300);
    	this.setTitle("A simple shape program");
    	this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    	
    	this.add(new PaintSurface(), BorderLayout.CENTER);
    	this.setVisible(true);
    }
    
    private class PaintSurface extends JComponent
    {
    	public void Paint (Graphics g)
    	{
    		Graphics2D g2 = (Graphics) g;
    		g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
            Shape s = new Ellipse2D.Float(20, 50, 250, 150);
            g2.setPaint(Color.BLACK);
            g2.draw(s);
    	}
    }
}

[vinci123]

i cant figure out the puzzle in this code.Lets see anyone who can do it