mandlar suurla

I am being read lot of articles how to implement the OO in javascript, but i havent seen the one standard way to do it. The latest ES5 way to do the OO too verbose, what to you thin what is the heading of OO style in JS ?

Currently there is no syntax problems so the code runs.
Problems what i am having now are
*When client connects and i add it to ActiveSessions, there will be added two instances at the same time(should be only one)

* On client side, pushing button send the object sending and receving works, but the client get's always the same Board object somehow. Like the turns count increases on server side but on client side the counter stays same, always 1 1 1.

As on the server side there's object Board and i share only objects reference to other sessionhandlers this should avoid the problem of making somewhere two different instances.

server main
package server; import game.Board; import game.GameState; import java.io.*; import java.net.*; import java.util.logging.Logger; public class SocketServer extends Thread { private static final Logger logger = Logger.getLogger(SocketServer.class.getName()); public static void main(String[] args) { ServerSocket socket; Board gameBoard = new Board(); ActiveSessions sessions = new ActiveSessions(); Broadcaster broadcaster = new Broadcaster(sessions, gameBoard); try { socket = new ServerSocket(1234); // Timeout after what no more new connections are not accepted. socket.setSoTimeout(30 * 1000); logger.info("Server started on port " + socket.getLocalPort()); while (true) sessions.addSession(new SessionHandler(socket.accept(), gameBoard, broadcaster)); } catch (SocketTimeoutException e1) { logger.info("No more new connecions are accpeted, start game or end"); gameBoard.setGameState(GameState.PLAYING); logger.info("Set the gamestate to " + gameBoard.getGameState()); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } package server; import game.Board; import game.Turn; import java.io.EOFException; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.net.Socket; import java.net.SocketException; import java.util.logging.Logger; public class SessionHandler implements Runnable { private Thread current; private Board gameBoard; private Socket socket; private Broadcaster broadcaster; private boolean firstConnect = true; private ObjectOutputStream out; private ObjectInputStream in; private static final Logger logger = Logger.getLogger(SocketServer.class.getName()); public SessionHandler(Socket socket) { this.socket = socket; current = new Thread(this); current.start(); } public SessionHandler(Socket accept, Board gameBoard, Broadcaster broadcaster) { this(accept); this.gameBoard = gameBoard; this.broadcaster = broadcaster; } @Override public void run() { try { out = new ObjectOutputStream(socket.getOutputStream()); in = new ObjectInputStream(socket.getInputStream()); while (true) { Turn turn = (Turn) in.readObject(); if (turn != null) { if (firstConnect) { gameBoard.addPlayer(turn.getWhoseTurn()); firstConnect = false; } // Add the turn to game board and make validation gameBoard.increaseTurns(); } System.out.println("Turns made " + gameBoard.getTurns() + " players " + gameBoard.getPlayers()); broadcaster.send(); } } catch (EOFException e1) { logger.warning("Problem reading the object output"); } catch (SocketException e) { if ("Connection reset".equals(e.getMessage())) { System.out.println("Client disconnected, performing cleanup"); } else { logger.warning("Connection between client lost " + Thread.currentThread()); } } catch (Exception e) { e.printStackTrace(); System.exit(-1); } } public void sendTheGameBoard() { try { out.writeObject(gameBoard); } catch (IOException e) { logger.warning("Problem with sending game board object " + e.getMessage()); } } public boolean isAlive() { return current.isAlive(); } } package server; import game.Board; import java.util.Iterator; class Broadcaster { private ActiveSessions activeSessions; private Board gameBoard; public Broadcaster(ActiveSessions aa, Board o) { activeSessions = aa; gameBoard = o; } public void send() { // Broadcast board forever synchronized (activeSessions) { Iterator<SessionHandler> active = activeSessions.iterator(); while (active.hasNext()) { SessionHandler session = active.next(); if (!session.isAlive()) { active.remove(); // ;-) } else { //System.out.println("Sent out to " + session.getName()); session.sendTheGameBoard(); } } } } } package server; import java.util.ArrayList; import java.util.Collection; import java.util.Iterator; public class ActiveSessions { private Collection<SessionHandler> sessionList = new ArrayList<SessionHandler>(); public synchronized void addSession(SessionHandler s) { sessionList.add(s); System.out.println("New player: " + s); } public Iterator<SessionHandler> iterator() { return sessionList.iterator(); } } package game; import java.io.Serializable; import java.util.ArrayList; public class Board implements Serializable { /** * */ private static final long serialVersionUID = 1682948139050917741L; /** * Tile where players starts the game. */ private Tile start; /** * Where the game ends. */ private Tile end; private GameState gameState; private ArrayList<Player> players = new ArrayList<Player>(); private Player currentTurn; private int turnsMade = 0; /** * Create basic board. */ public Board() { start = new Tile("Start"); Tile t1 = new Tile("1"); start.setNext(t1); end = new Tile("End"); t1.setNext(end); end.setNext(null); } public int getPlayerCount() { return players.size(); } public void setStart(Tile start) { this.start = start; } public void increaseTurns() { this.turnsMade++; } public int getTurns() { return turnsMade; } public Tile getStart() { return start; } public void setGameState(GameState gameState) { this.gameState = gameState; } public GameState getGameState() { return gameState; } public synchronized void addPlayer(Player player) { players.add(player); } public synchronized ArrayList<Player> getPlayers() { return players; } } package game; import java.io.Serializable; public class Turn implements Serializable { /** * */ private static final long serialVersionUID = 9218710539359281798L; private int diceScore; private Player whoseTurn; public void setDiceScore(int diceScore) { this.diceScore = diceScore; } public int getDiceScore() { return diceScore; } public void setWhoseTurn(Player whoseTurn) { this.whoseTurn = whoseTurn; } public Player getWhoseTurn() { return whoseTurn; } }

Client side
package client; import game.GameState; import game.Board; import game.Player; import game.Turn; import java.awt.*; import java.awt.event.*; import java.io.*; import java.net.*; import java.util.*; import javax.swing.*; public class SocketClient extends JFrame { /** * */ private static final long serialVersionUID = -4337224685051849004L; Player player; private Socket socket = new Socket("localhost", 1234); private ObjectOutputStream out = null; private ObjectInputStream in = null; JTextField entryField = new JTextField(40); JLabel status = new JLabel("Enter some text and hit send"); JButton send = new JButton("Send"); public static void main(String[] args) throws Exception { new SocketClient().setVisible(true); } public SocketClient() throws Exception { player = new Player(generateName()); this.setDefaultCloseOperation(EXIT_ON_CLOSE); out = new ObjectOutputStream(socket.getOutputStream()); in = new ObjectInputStream(socket.getInputStream()); final NetworkListenerModel listener = new NetworkListenerModel(in, out, player); JPanel statusBarPanel = new JPanel(new FlowLayout(FlowLayout.LEFT)); setTitle("Circus game client - " + player.getName()); statusBarPanel.setBorder(BorderFactory.createLoweredBevelBorder()); status.setEnabled(false); statusBarPanel.add(status); this.add(statusBarPanel, BorderLayout.SOUTH); send = new JButton("Send"); send.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { listener.increaseCount(); } }); add(send); pack(); } /** * Generate random name. * @return String player name */ private String generateName() { String[] names = { "Vanja", "Miku", "Kiku", "Juku", "Toots", "Mart" }; return names[(int) (Math.random() * names.length)] + (int) (Math.random() * 1000); } } class NetworkListenerModel extends Observable implements Runnable { private Socket socket = null; private ObjectOutputStream out = null; private ObjectInputStream in = null; private Turn turn; private Player player; public NetworkListenerModel(ObjectInputStream in, ObjectOutputStream out, Player player) throws Exception { socket = new Socket("localhost", 1234); this.out = out; this.in = in; this.player = player; new Thread(this).start(); } public void run() { registerConnectingPlayer(player); synchronized (this) { do { try { Object ob = in.readObject(); if (ob != null && ob instanceof Board) { System.out.println("From server :" + ((Board) ob).getTurns() + " " + (((Board) ob).getGameState() instanceof GameState)); System.out.println(((Board) ob).getPlayers().toString()); ob = null; } } catch (ClassNotFoundException ignored) { } catch (IOException ignored) {} } while (true); } } public void registerConnectingPlayer(Player player) { Turn turn = new Turn(); turn.setWhoseTurn(player); try { out.writeObject(turn); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void increaseCount() { Turn turn = new Turn(); int score = new Random().nextInt(5) + 1; turn.setDiceScore(score); try { out.writeObject(turn); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }

Campbell Ritchie wrote:What sort of data structure is that? It looks to me like a binary tree. So what is the algorithm for a depth first search? If you are getting the wrong result you are using the wrong algorithm. What do you mean by path? Are you going to have a linked list of nodes to the number sought? Or a String?

You will have to use the very expensive hardware I so often recommend: a Cray occupying a building the size of a cinema pencil, eraser, and sheet of paper. ?Write down how you are going to tell whether you have found a value, and how you are going to add it to a path. Since it is recursive, start with a little tree, like this one| | 1Then take your recursion one level higher 1 / \ 2 3and work out how you are to handle something like 1 / \ 2 nullGet that sort of thing working, and it becomes easy to scale up for recursion over any kind of tree. You can work out the depth at which you found the value, from the length of the path.

I am sorry that i draw the binary tree, i forgot to mention the cycles are allowed like node 5 and 10 could be connected. It needs to find path between 2 nodes, no dijkstra and A* algorithms( i dont need to find shortest). Currently my code traverses all the nodes and doesn't deal with path finding. So i tought i need Stack to hold path, but how i know which element is part of path.

Well i got graph and i have to get path to the number what is searched. Like in example n1.dfs(visited, 15); should end on when 15 is found but it wont currently. As you can see it visits all nodes, but how would i extract from visited nodes the path.
Also when i reach end it keeps visiting sub nodes.

Full graph is here http://img19.imageshack.us/i/graphsz.png/

Node.java
package graph; import java.util.Set; public class Node { public int value; public Node left, right, top, bottom; public Node(int value) { this.value = value; } public void dfs(Set<Node> visited, int lookingForValue) { if (value == lookingForValue) { System.out.println("Found"); return; } if (visited.contains(this)) { return; } visited.add(this); if (left != null) left.dfs(visited, lookingForValue); if (right != null) right.dfs(visited, lookingForValue); if (top != null) top.dfs(visited, lookingForValue); if (bottom != null) bottom.dfs(visited, lookingForValue); } @Override public String toString() { return Integer.toString(value); } }

Test.java
package graph; import java.util.HashSet; import java.util.Set; public class Test { /** * @param args */ public static void main(String[] args) { Node n1 = new Node(1); Node n2 = new Node(2); Node n3 = new Node(3); Node n5 = new Node(5); Node n4 = new Node(4); Node n7 = new Node(7); Node n8 = new Node(8); Node n9 = new Node(9); Node n10 = new Node(10); Node n15 = new Node(15); n1.bottom = n2; n2.top = n1; n2.right = n3; n3.left = n2; n3.right = n5; n5.left = n3; n2.left = n4; n4.right = n2; n4.bottom = n7; n7.top = n4; n7.bottom = n8; n8.top = n7; n8.right = n9; n9.left = n8; n9.right = n10; n10.left = n9; n9.bottom = n15; n15.top = n9; Set<Node> visited = new HashSet<Node>(); n1.dfs(visited, 15); System.out.println(visited); } }

Stephan van Hulst wrote:Hey there! Can you explain in your own words what the difference is between:

++counter;
and
counter++?

If you don't know the difference, look up what the difference is between prefix increment and postfix increment.

Take note that the correct words are "recursion" and "recursive", not "recrusion" and "recrusive".

prefix increment, the statement value is increased first before use, but postfix increment takes value and then increases.

example
counter = 0;

if (++counter) -- the counter is increased first and then the boolean check if (1)

if (counter++) -- counter is increased after use in statement if (0) and then make +1

Am I right ? But the problem still lies in recursion.

I am struggling with this problem for long time and i haven't found any simple solutions.

As you can see i have made simple list to store numbers from 0 to 4, but the problem it gets the stackOverFlowError.
The result should be list.get(0) = 0 ... and list.get(3) = 4
/** * It should add all the numbers from 0 to 4 in list and return it */ ArrayList<Integer> numbers = new ArrayList<Integer>(); public ArrayList<Integer> recursive(int counter) { if (counter <= 4) { numbers.add(counter); numbers = recursive(counter++); } return numbers; }

So as far i have seen that Android is really clean and well documented SDK. What about blackberry, how easy would be starting from scratch blackberry.

I am sorry for upping old thread, but i try to implement also MVC pattern in my Swing app. So i made simple examples which should follow simple rules, like all are independent.

Model
package myTemperatureExample; import java.util.Observable; public class Temperature extends Observable { private int temp; public Temperature() { this.temp = 0; } public Temperature(int temp) { this.temp = temp; } public int getTemp() { return temp; } public void setTemp(int temp) { this.temp = temp; setChanged(); notifyObservers(); } }

Controller and View. As you can see the controller is inner class which you can make as separate class also you can add sub-controllers, like you got there 5 buttons and all are doing something difficult, you can actually make sub-controllers for that.

One thing what i think should be done a bit differently. View should be class which extends from JPanel and then make the Application creation class where you add view. What you think ?

package myTemperatureExample; import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.Observable; import java.util.Observer; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextField; public class TemperatureGUI extends JFrame implements Observer { JButton addButton; JButton removeButton; JTextField textfield; Temperature t; public TemperatureGUI() { Controller c = new Controller(); JPanel mainPanel = new JPanel(new BorderLayout()); addButton = new JButton("Add"); addButton.setActionCommand("ADD"); addButton.addActionListener(c); removeButton = new JButton("Remove"); removeButton.setActionCommand("REMOVE"); removeButton.addActionListener(c); textfield = new JTextField(10); t = new Temperature(); t.addObserver(this); t.setTemp(38); mainPanel.add(addButton, BorderLayout.NORTH); mainPanel.add(removeButton, BorderLayout.SOUTH); mainPanel.add(textfield, BorderLayout.CENTER); getContentPane().add(mainPanel); setSize(150, 150); } @Override public void update(Observable ob, Object obj) { if (ob instanceof Temperature) { textfield.setText(Integer.toString(t.getTemp())); } } private class Controller implements ActionListener { @Override public void actionPerformed(ActionEvent e) { String command = e.getActionCommand(); int currentTemp = t.getTemp(); if (command == "ADD") { currentTemp++; t.setTemp(currentTemp); } else if (command == "REMOVE") { currentTemp--; t.setTemp(currentTemp); } System.out.println("Temp set to:" + t.getTemp()); } } public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater(new Runnable() { @Override public void run() { new TemperatureGUI().setVisible(true); } }); } }

I dont want to make new topic so i use my old one. So i tried to make use of my own configure class but that wasn't good idea. I am going to use pref API, but there is one little problem, as you insert or get the data you need to provide default data, but when i am using same fields in my app many times and in some other classes its like over typing same thing.

So my idea is to use "" empty string for default. If anyone got any good solution, then please help.

I made before your post singleton class which writes in the same method to log and textarea, but i need to say that i used textarea object as static variable, i think is should pass by parameter.

I am logging program with log4j and I want to show the logged information in JTextArea is it possible and if it is, is it hard to make? Or got any tutorial for it? I would like to make them both be synchronous so when information is logged then it displays it at same time in textarea.

Here is current layout of folders:
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\WebTest\WebRoot - main dir made by eclipse web project, here are jsp files

C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\WebTest\WebRoot\META-INF

C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\WebTest\WebRoot\WEB-INF - here are classes located, also lib folder, and off curse web.xml

k i made project under C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\WebTest

and web acces is from http://localhost/WebTest/WebRoot/loginBean.jsp, but still same error.

k here is the full path to class file
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\examples\jsp\TestWeb\WebRoot\WEB-INF\classes\test\LoginTestBean.class

classes is under WEB-INF folder its put there automatically as I use MyEclipse it makes the class file from src folder.