Não conecta

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;


/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * prjFrame.java
 *
 * Created on 13/09/2002, 04:30:32
 */

/**
 *
 * @author User
 */
public class prj extends javax.swing.JFrame implements ActionListener {
    
    Socket sock;
    PrintWriter writer;

    /** Creates new form prjFrame */
    public prj() {
        super("Chat");
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {
        setUpNetworking();
        jScrollPane1 = new javax.swing.JScrollPane();
        chatBox = new javax.swing.JTextArea();
        chatField = new javax.swing.JTextField();
        sendButton = new javax.swing.JButton();
        sendButton.addActionListener(this);

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setBackground(new java.awt.Color(255, 255, 255));
        setName("mainFrame"); // NOI18N

        chatBox.setColumns(20);
        chatBox.setEditable(false);
        chatBox.setRows(5);
        jScrollPane1.setViewportView(chatBox);

        sendButton.setText("Send");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(chatField)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addComponent(sendButton))
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 355, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(19, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(17, Short.MAX_VALUE)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(chatField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(sendButton))
                .addGap(19, 19, 19))
        );

        java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
        setBounds((screenSize.width-400)/2, (screenSize.height-200)/2, 400, 200);
    }// </editor-fold>

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new prj().setVisible(true);
            }
        });
    }

    public javax.swing.JTextArea chatBox;
    public javax.swing.JTextField chatField;
    private javax.swing.JScrollPane jScrollPane1;
    public javax.swing.JButton sendButton;

    public void actionPerformed(ActionEvent e) {
        try {
            writer.println(chatField.getText());
            writer.flush();
        }
        catch (Exception ex) {
            ex.printStackTrace();
        }
        chatField.setText("");
        chatField.requestFocus();
    }

    private void setUpNetworking() {
        try {
            sock = new Socket("189.4.119.221", 7777);
            writer = new PrintWriter(sock.getOutputStream());
            System.out.println("Connection estabilished.");
        }
        catch (IOException ex) {
            ex.printStackTrace();
        }
    }
}