在这段java代码中如何实现两个不同IP的交流？报错

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import java.io.; import java.net.;

class Send implements Runnable { private DatagramSocket ds; public Send(DatagramSocket ds) { this.ds = ds; }

public void run()
{
    try
    {
        BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));
        String line = null;
        while((line = bufr.readLine())!=null)
        {
            if("886".equals(line))
                break;
            byte[] buf = line.getBytes();
            
            DatagramPacket dp =
            new DatagramPacket(buf,buf.length,InetAddress.getByName("192.168.1.105"),10002);
            ds.send(dp);
        }
    }
    catch(Exception e)
    {
        throw new RuntimeException("发送端失败");
    }
}

}

class Rece implements Runnable { private DatagramSocket ds; public Rece(DatagramSocket ds) { this.ds = ds; }

public void run()
{
    try
    {
        while(true)
        {
            byte[] buf = new byte[1024];
            DatagramPacket dp = new DatagramPacket(buf,buf.length);
            ds.receive(dp);
            String ip = dp.getAddress().getHostAddress();
            String data = new String(dp.getData(),0,dp.getLength());
            
            System.out.println(ip+"::"+data);
        }
    }
    catch(Exception e)
    {
        throw new RuntimeException("接收端失败");

    }
}

}

class ChartDemo { public static void main(String[] args)throws Exception { DatagramSocket sendSocket = new DatagramSocket(); DatagramSocket receSocket = new DatagramSocket(10002);

    new Thread(new Send(sendSocket)).start();
    new Thread(new Rece(receSocket)).start();
}

}

在上面这段代码里，如果要实现两台电脑的交流，需要在什么样的网络环境下进行呢？
比如我将 DatagramPacket dp =

                new DatagramPacket(buf,buf.length,InetAddress.getByName("192.168.1.105"),10002);这行代码里的ip地址修改一下改成别的电脑的，在什么样的网络环境下可以实现呢？