Class Timer

Question

I don't know why this code doesn't work:
Timer t = new Timer(500, new TimerAction());
t.start();
The error is: Invalid method declaration.
TimerAction is class which implements ActionListener
Please help me!

Answer 1

This is my code it works but server doesn't received message "FromTimer"
It Receves only "Send" messages. Why?
package chat;
import java.io.*;
import java.net.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.Timer;
public class MyChatRoom extends JFrame implements ActionListener{
//TimerAction myTimer = new TimerAction();
Timer t = new Timer(500, new TimerAction());
t.start();
class TimerAction implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
socket = new Socket("localhost", 1001);
toServer = new PrintStream(socket.getOutputStream());
frmServer = new ObjectInputStream(socket.getInputStream());
toServer.println("FromTimer");
Vector vector = (Vector) frmServer.readObject();
int i = messageCount;
for(;i < vector.size();i ++) {
areaSentMessages.append((String) vector.elementAt(i));
areaSentMessages.append("\n");
messageCount = i;
} catch(Exception e1) {
System.out.println("Exception occured" + e1);
Vector vector;
JLabel lblNewMessage;
JLabel lblSentMessages;
JLabel lblUsers;
JTextArea areaSentMessages;
JTextArea areaUsers;
JTextField txtNewMessage;
JButton btnSend;
JButton btnLogOut;
JScrollPane jspSentMessages;
JScrollPane jspUsers;
JPanel pnl;
String userName;
String removeName;
Socket socket;
PrintStream toServer;
ObjectInputStream frmServer;
//String message;
int messageCount = 0;
public MyChatRoom(String name) {
Timer t = new Timer(500, new TimerAction());
vector = new Vector();
userName = new String(name);
removeName = new String(name);
setTitle("Chat Room :" + userName);
pnl = new JPanel();
pnl = (JPanel)this.getContentPane();
pnl.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
lblSentMessages = new JLabel("Sent Messages");
pnl.add(lblSentMessages, gbc);
gbc.gridx = 1;
gbc.gridy = 0;
lblUsers = new JLabel("Users");
pnl.add(lblUsers, gbc);
gbc.gridx = 0;
gbc.gridy = 1;
gbc.gridheight = 1;
gbc.gridwidth = 1;
gbc.weightx = 1;
gbc.weighty = 1;
areaSentMessages = new JTextArea(20, 30);
jspSentMessages = new JScrollPane(areaSentMessages,
JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
JScrollPane.
HORIZONTAL_SCROLLBAR_AS_NEEDED);
pnl.add(jspSentMessages, gbc);
gbc.gridx = 1;
gbc.gridy = 1;
gbc.gridheight = 1;
gbc.gridwidth = 1;
gbc.weightx = 1;
gbc.weighty = 1;
areaUsers = new JTextArea(20, 10);
jspUsers = new JScrollPane(areaUsers,
JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
pnl.add(jspUsers, gbc);
JPanel pnlMessage = new JPanel();
lblNewMessage = new JLabel("Message ");
pnlMessage.add(lblNewMessage);
txtNewMessage = new JTextField(25);
pnlMessage.add(txtNewMessage);
gbc.gridx = 0;
gbc.gridy = 2;
pnl.add(pnlMessage, gbc);
JPanel pnlButtons = new JPanel();
btnSend = new JButton(" Send ");
pnlButtons.add(btnSend);
btnSend.addActionListener(this);
btnLogOut = new JButton("Log Out");
pnlButtons.add(btnLogOut);
btnLogOut.addActionListener(this);
gbc.gridx = 1;
gbc.gridy = 2;
pnl.add(pnlButtons, gbc);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(550, 450);
show();
public void actionPerformed(ActionEvent event) {
JButton button = new JButton();
button = (JButton) event.getSource();
if(btnSend.equals(button)) {
try {
socket = new Socket("localhost", 1001);
frmServer = new ObjectInputStream(socket.getInputStream());
toServer = new PrintStream(socket.getOutputStream());
String message = txtNewMessage.getText();
toServer.println("Send");
toServer.println(userName + ":" + message);
txtNewMessage.setText("");
vector = (Vector) frmServer.readObject();
int i = messageCount;
for(;i < vector.size();i ++) {
//System.out.println(vector.elementAt(messageCount));
areaSentMessages.append( (String) vector.elementAt(i));
areaSentMessages.append("\n");
messageCount = i;
} catch(Exception e) {
System.out.println("Exception occured " + e);
public static void main(String[] args) {
String name = new String();
new MyChatRoom(name);
}