Alguem me ajuda com swing

eu fiz o seguinte codigo que peguei num tutorial

package biblioteca;

import java.awt.*;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.awt.event.WindowListener;

import javax.swing.*;

public class Sswing extends JFrame{

JLabel l1,l2,l3,l4;

ImageIcon icone = new ImageIcon(“c:/windows/cafezinho.bmp”);

Sswing(){

setTitle(“Inserindo Icones”);

setSize(350,120);

setLocation(50,50);

getContentPane().setBackground(new Color(220,220,220));

l1 = new JLabel(" Aprendendo a Ser Otario",JLabel.LEFT);

l1.setForeground(Color.blue);

l2 = new JLabel(icone);

l2 = new JLabel("inserir ",JLabel.RIGHT);

l3.setForeground(Color.GRAY);

l4=new JLabel(“Label/Imagens”,icone,JLabel.CENTER);

l4.setFont(new Font(“Serif”,Font.BOLD,20));

l4.setForeground(Color.BLACK);

getContentPane().setLayout(new GridLayout(4,1));

// 4 linhas e 1 coluna

getContentPane().add(l1);

getContentPane().add(l2);

getContentPane().add(l3);

getContentPane().add(l4);

}

public static void main(String[] args) {

JFrame Janela = new Sswing();

Janela.show();

WindowListener x = new WindowAdapter(){

public void windowClosing(WindowEvent e){

System.exit(0);

}

};

Janela.addWindowListener(x);

}