catch (Exception e) {
  e.printStackTrace();
}

Log.i(LOG_TAG, "1");
try {
    client = new Socket(serverAddr, port);
} catch (IOException ex) {
} catch (SecurityException ex) {
} catch (IllegalArgumentException ex) {
} catch (NullPointerException  ex) {
}
Log.i(LOG_TAG, "2");

System.gc() start
System.gc() end
Garbage collected: 9
Garbage collected: 8
Garbage collected: 7
Garbage collected: 6
Garbage collected: 5
Garbage collected: 2
Garbage collected: 1
Garbage collected: 0
Garbage collected: 4
Garbage collected: 3

System.gc() start
System.gc() end
Garbage collected: 9
Garbage collected: 8
Garbage collected: 7

System.gc() start
Garbage collected: 9
Garbage collected: 8
Garbage collected: 7
Garbage collected: 6
Garbage collected: 5
Garbage collected: 4
Garbage collected: 3
Garbage collected: 2
Garbage collected: 1
Garbage collected: 0
System.gc() end

    static private class Garbage {
        static private int counter;
        private int[] data = new int[4096];
        private int id = counter++;
                   
        protected void finalize() {System.out.println("Garbage collected: " + id);}
    }   
   
    private Garbage[] trash;

    // valahol a kódban
    for (int index = (trash = new Garbage[10]).length; index-- != 0; ) trash[index] = new Garbage();   

    // valahol máshol
    trash = null;
    System.out.println("System.gc() start");
    System.gc();
    System.out.println("System.gc() end");

    public void INIT(){
        if(Main.isFullscreen()){
            scale = Math.min(getWidth()/(float)Screen.width, getHeight()/(float)Screen.height);
            translatex = (int)(getWidth()-Screen.width*scale)/2;
            translatey = (int)(getHeight()-Screen.height*scale)/2;
        }else{
            translatex = 0;
            translatey = 0;
        }
        createBufferStrategy(2);
        bufferStrategy = getBufferStrategy();
    }
   
    public void render(){
        Graphics2D g = null;
        try{
            g = (Graphics2D)bufferStrategy.getDrawGraphics();
            g.setColor(screen.backgroundColor());
            g.fillRect(0, 0, getWidth(), getHeight());
            g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
            g.setFont(new Font(Font.MONOSPACED, Font.BOLD, 20));
//            g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            g.translate(translatex, translatey);
            g.scale(scale, scale);
            screen.paint(g);
            bufferStrategy.show();
        }finally{
            if(g!=null)
                g.dispose();
        }
    }

JPanel root = new JPanel(new BorderLayout());
JPanel toolsPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
toolsPanel.setBorder(BorderFactory.createTitledBorder("Toolbar"));
root.add(toolsPanel, BorderLayout.NORTH);

setExtendedState(getExtendedState() | JFrame.MAXIMIZED_BOTH);

GraphicsConfiguration config = getPreferredConfiguration();

public static java.awt.GraphicsConfiguration getPreferredConfiguration() {
// kerjük le a grafikus eszközt
GraphicsDevice gDevice = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
// adjuk vissza a legjobb konfigurációt
        return gDevice.getBestConfiguration(new GraphicsConfigTemplate3D());
}

[code]GraphicsConfiguration config = null;

while(_keepAlive){
try{
_message = "";
_data = "";
_type = CPacketType.PACKET_INVALID;
_raw = new byte[512];

_packet = new DatagramPacket(_raw, _raw.length);
_socket.receive(_packet); //waits 'till it receives something
//CDebug.logActivity(false, new String(_packet.getData()));

_message = new String(_packet.getData()).trim();
_data = _message.substring(2, _message.length());
_type = CProtocol.getPacketType(Integer.parseInt(_message.substring(0, 1)));

if (_type == CPacketType.PACKET_HOST_REQ){
...
}
else if(_type == CPacketType.PACKET_PONG){
_hosts.get(Integer.parseInt(_message.substring(1))).setLatency(System.currentTimeMillis());
}
}
catch(IOException e){ CDebug.log(TAG, "Could not read packet data!"); }
}

@Override
public void run(){
while(_connected){
if (System.currentTimeMillis() - _lasthb >= CPreferences.HBINTERVAL){
try{
DatagramPacket packet = new DatagramPacket(new byte[255], 254);
DatagramSocket socket = new DatagramSocket();

packet.setAddress(_address);
packet.setPort(_port);
packet.setData(CProtocol.createPackage(CPacketType.PACKET_PING, ""));

socket.send(packet);


CServer.sendPackage(packet, CPacketType.PACKET_PING, "");

CDebug.logActivity(true, "Sending HB packet to host " + _address.getHostAddress() + "...");
_lasthb = System.currentTimeMillis();
}catch(IOException e){ CDebug.log(TAG, e.getMessage()); }

}
}

CDebug.log(TAG, "Game " + _id + " lived for " + (System.currentTimeMillis() - _time));
}