Java OutputStream和InputStream初始化

Question

I have the following code:

    private Socket mSenderSocket = null;

    private DataInputStream in = null;
    private DataOutputStream out = null;

    ...

        try 
        {
            mSenderSocket = new Socket(java.net.InetAddress.getByName(TCP_SERVER_IP), 12345);
            out = new DataOutputStream(mSenderSocket.getOutputStream());
            in = new DataInputStream(mSenderSocket.getInputStream());
        } 
        catch (UnknownHostException ex) 
        {
           System.err.println("Don't know about host.");
        }
        catch(IOException ex)
        {
            System.err.println("Couldn't get I/O");
        }

I am interested in the following scenario:

During the chat session if an I/O exception occurs then I have to do the following:

mSenderSocket = new Socket(java.net.InetAddress.getByName(TCP_SERVER_IP);

Now what happens with the DataInputStream and the DataOutputStream ?

Should I initialize theese objects again or not?

Answer 1

Almost certainly in an error condition you want to throw away the entire object and start again, or don't even construct the object in the first place.

(You also probably want a finally on that to close the Socket . As it happens, calling close on either stream or on the Socket will completely close all three objects.)