ObjectInput-Output Stream problem ?

Question

I have a server-client program and I am sending my data on OutputStream()
            input = new InputStream(mydataSocket.getInputStream()) ;
            output = new OutputStream(mydataSocket.getOutputStream()) ;
            objInput = new ObjectInputStream(input) ;
            objOutput = new ObjectOutputStream(output) ;but I am taking an error.
Implement all abstract method() ;
is this read() method necessary ?

Answer 1

Server
    protected void runServer() throws IOException
        ServerSocket serSock = null ;
        Socket sock ;
        ObjectOutputStream output ;
        ObjectInputStream input ;
        String line ;
        ArrayList<String> al = new ArrayList<String>() ;
        try {
            serSock = new ServerSocket(5000,100) ;
            while (true)
                sock = serSock.accept() ;
                input = new ObjectInputStream(sock.getInputStream()) ;
                output = new ObjectOutputStream(sock.getOutputStream()) ;
                    line = input.readUTF() ;
                    al.add(line) ;
                try {
                        for ( int j = 0 ; j < al.size() ; j++ )
                            oyuncu_listesi += al.get(j) + "," ;
                            output.writeUTF(al.get(j)) ;
                } catch (IOException e) {
                    System.err.println(e) ;
                    e.printStackTrace();
                    System.exit(1);
                sock.close() ;
       } catch(IOException e) {
            System.out.println(e) ;
        finally {
            serSock.close() ;
    }Client
    protected void baglan() throws IOException
            Socket client ;
            ObjectInputStream input ;
            ObjectOutputStream output ;
            String line , deger ;
            try {
                client = new Socket(InetAddress.getLocalHost() ,5000) ;
                input = new ObjectInputStream(client.getInputStream()) ;
                output = new ObjectOutputStream(client.getOutputStream()) ;
                    deger = girdi.getText() ;
                    output.writeUTF(deger) ;
                    output.flush() ;
                while ( true ) {
                        line = input.readUTF() ;
                        liste.addElement(line + "\n") ;
            } catch (IOException e) {
                System.out.println(e) ;
    }