Two foundation questions about socket

Question

1
when I close socket(this Program is still running),I open this socket again,
why a exception happened?
this exception is :java.net.SocketException: socket closed
2
when I close socket,
I write:
write.close();
read.close();
cSocket.close();
this sequence is right?

Answer 1

1
when I close socket(this Program is still running),I
open this socket again,
why a exception happened?
this exception is :java.net.SocketException: socket closedIt's in the documentation
Socket.close()
2
when I close socket,
I write:
write.close();
read.close();
cSocket.close();
this sequence is right?Harmless, but not necessary.
The InputStream and OutputStream objects you get from Socket are just java internal constructs that use the socket filehandle. Not explicitly closing them does not cause a filehandle leak or anything like that. If you are paranoid you can doif (!Csocket.isClosed()) write.flush();
write = null;
read = null;
if (!cSocket.isClosed()) cSocket.close();
cSocket = null;