关于socket通信的一个有关问题

//其中socketA和socketB是五子棋对战的双方
    class BeginGame implements Runnable{
        private Socket socketA = null;
        private Socket socketB = null;
        private boolean isBlack = true;
        public BeginGame(Socket socketA,Socket socketB){
            this.socketA = socketA;
            this.socketB = socketB;
        }
        public void run(){
            int x;//x，y用来记录棋盘上棋子的坐标
            int y;
            boolean first = true;
            while(true){
                try {
                    //获取对战双方的输出流
                    DataOutputStream outA = new DataOutputStream(socketA.getOutputStream());
                    DataOutputStream outB = new DataOutputStream(socketB.getOutputStream());
                    if(first){
                        //在游戏刚开始的时候，分别发送信息给对战的双发，1表示为黑棋，2表示为白棋
                        outA.writeInt(1);
                        outB.writeInt(2);
                        first = false;
                    }
                    
                    
                    DataInputStream inA = new DataInputStream(socketA.getInputStream());
                    DataInputStream inB = new DataInputStream(socketB.getInputStream());
                    //isBlack用于判定是黑棋发送来的信息还是白棋，初始化为false
                    if(isBlack){
                        //读取黑方发送来的x，y坐标值
                        x = inA.readInt();
                        y = inA.readInt();
                        
                        System.out.println("black: "+x+" "+y);
                        //gamePoint用来存储整个棋盘的信息，初始全为0，为黑棋时设为1，白棋时设为2
                        //如果该点上已有棋子，则重新等待黑方再次发送坐标
                        if(gamePoint[x][y]!=0)
                            continue;
                        else
                            gamePoint[x][y] = 1;
                        //将黑方发送来的x，y坐标值发送给白方
                        outB.writeInt(x);
                        outB.writeInt(y);
                        isBlack = false;
                    }else{
                        //处理白方发送来的信息
                        x = inB.readInt();
                        y = inB.readInt();
                        
                        if(gamePoint[x][y]!=0)
                            continue;
                        else
                            gamePoint[x][y] = 2;
                        System.out.println("white "+x+" "+y);
                        
                        outA.writeInt(x);
                        outA.writeInt(y);
                        isBlack = true;
                    }        

                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }        
        }
    }

gamePanel.addMouseListener(new MouseAdapter(){
            public void mousePressed(MouseEvent e){
                if(beginGame){
                    //读取鼠标点击的坐标值，转化为对应的数组的x，y值
                    int x = (e.getX()-gamePanel.cellSize_x/2)/gamePanel.cellSize_x;
                    int y = (e.getY()-gamePanel.cellSize_y/2)/gamePanel.cellSize_y;

                    try {    
                        //向服务器端发送坐标值
                        out.writeInt(x);
                        out.writeInt(y);
                    } catch (IOException e1) {
                        e1.printStackTrace();
                    }                    
                    gamePanel.repaint();
                }
            }
        });

private boolean isBlack = true;
 //isBlack用于判定是黑棋发送来的信息还是白棋，初始化为false