diff --git a/examples/src/TcpExamples/TcpExample2ConnectionCounting.java b/examples/src/TcpExamples/TcpExample2ConnectionCounting.java
index 6dfcf88e81c6ba9f73361c6fa9ee83e6d01eb0d1..330d8cee4d0936192f1e3dfedb6875b8228122b2 100644
--- a/examples/src/TcpExamples/TcpExample2ConnectionCounting.java
+++ b/examples/src/TcpExamples/TcpExample2ConnectionCounting.java
@@ -33,7 +33,7 @@ public class TcpExample2ConnectionCounting
// ServerSocket waits for a connection from a client.
// Notice that it is outside the loop; ServerSocket needs to be made only once.
- int connectionCount = 0; // state variable
+ int connectionCount = 0; // state variable
ServerSocket serverSocket = new ServerSocket(2317); // server decides here what port to listen on.
// of interest: often client doesn't care what port it uses locally when connecting to that server port.
@@ -42,53 +42,53 @@ public class TcpExample2ConnectionCounting
// Stop the program somewhere else.
while(true)
{
- Socket clientConnection = serverSocket.accept(); // blocks! then proceeds once a connection is "accept"ed
-
- connectionCount++; // got another one!
-
- OutputStream os = clientConnection.getOutputStream();
- PrintStream ps = new PrintStream(os);
-
- ps.println("This client response was written by server TcpExample2ConnectionCounting"); // to remote client
- System.out.println("This server response was written by server TcpExample2ConnectionCounting"); // to server console
-
- ps.println("You were connection #" + connectionCount + ", by my count");
-
- // Print some information locally about the Socket connection.
- // This includes the port and IP numbers on both sides (the socket pair.)
-
- InetAddress localAddress = clientConnection.getLocalAddress();
- InetAddress remoteAddress = clientConnection.getInetAddress();
-
- int localPort = clientConnection.getLocalPort();
- int remotePort = clientConnection.getPort(); // remember the prior question, why are 2 ports different?
-
- // My socket pair connection looks like this, to localhost:
- // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54876 )) note IPv6
- // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
- //
- // Why is first IP/port the same, while the second set has different ports?
-
- System.out.println("Socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( " +
- remoteAddress.toString() + ", " + remotePort + " ))");
-
- System.out.println("got another connection, #" + connectionCount); // report progress
-
- // Notice the use of flush() and close(). Without
- // the close() to Socket object may stay open for
- // a while after the client has stopped needing this
- // connection. Close() explicitly ends the connection.
- ps.flush();
- clientConnection.close();
+ // blocks! then proceeds once a connection is "accept"ed
+ try (Socket clientConnection = serverSocket.accept()) {
+ connectionCount++; // got another one!
+
+ OutputStream os = clientConnection.getOutputStream();
+ PrintStream ps = new PrintStream(os);
+
+ ps.println("This client response was written by server TcpExample2ConnectionCounting"); // to remote client
+ System.out.println("This server response was written by server TcpExample2ConnectionCounting"); // to server console
+
+ ps.println("You were connection #" + connectionCount + ", by my count");
+
+ // Print some information locally about the Socket connection.
+ // This includes the port and IP numbers on both sides (the socket pair.)
+
+ InetAddress localAddress = clientConnection.getLocalAddress();
+ InetAddress remoteAddress = clientConnection.getInetAddress();
+
+ int localPort = clientConnection.getLocalPort();
+ int remotePort = clientConnection.getPort(); // remember the prior question, why are 2 ports different?
+
+ // My socket pair connection looks like this, to localhost:
+ // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54876 )) note IPv6
+ // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
+ //
+ // Why is first IP/port the same, while the second set has different ports?
+
+ System.out.println("Socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( " +
+ remoteAddress.toString() + ", " + remotePort + " ))");
+
+ System.out.println("got another connection, #" + connectionCount); // report progress
+
+ // Notice the use of flush() and close(). Without
+ // the close() to Socket object may stay open for
+ // a while after the client has stopped needing this
+ // connection. Close() explicitly ends the connection.
+ ps.flush();
+ } // got another one!
}
}
catch(IOException e)
{
- System.out.println("Problem with TcpExample2ConnectionCounting networking:"); // describe what is happening
- System.out.println("Error: " + e);
+ System.err.println("Problem with TcpExample2ConnectionCounting networking:"); // describe what is happening
+ System.err.println("Error: " + e);
// Provide more helpful information to user if exception occurs due to running twice at one time
if (e instanceof java.net.BindException)
- System.out.println("*** Be sure to stop any other running instances of programs using this port!");
+ System.err.println("*** Be sure to stop any other running instances of programs using this port!");
}
}
}