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