classroom tuneups and diagnostics/comments

projects/TcpExample4/TcpClient/TcpClient/src/tcpclient/TcpClient.java

@@ -2,7 +2,7 @@ package tcpclient;
 
 import java.io.*;
 import java.net.*;
-import java.time.LocalTime;
+//import java.time.LocalTime; // conversion?
 
 /**
  * This is a slightly different client. It establishes a connection
@@ -13,12 +13,11 @@ import java.time.LocalTime;
  */
 public class TcpClient 
 {
-
     public static void main(String[] args) 
     {
         try
         {
-           System.out.println("creating socket");
+           System.out.println("creating socket"); // "here i am" on console
            
            // We request an IP to connect to ("localhost") and
            // port number at that IP (2317). This establishes
@@ -39,20 +38,16 @@ public class TcpClient
            BufferedReader br = new BufferedReader(isr);
            
            String serverMessage = br.readLine();
-           long readTime = System.currentTimeMillis();
+           long   readTime = System.currentTimeMillis();
            long timeLength = readTime - startTime;
            
            System.out.println("The message the server sent was " + serverMessage);
            System.out.println("The time to read in ms was " + timeLength);
         }
-        catch(Exception e)
+        catch(IOException e)
         {
             System.out.println("Problem with client");
             System.out.println(e);
         }
-
     }
-    
-
-    
 }
\ No newline at end of file

projects/TcpExample4/TcpThreadServer/TcpThreadServer/src/tcpthreadserver/HandlerThread.java

@@ -33,8 +33,9 @@ public class HandlerThread extends Thread
     /** Handles one connection. We add an artificial slowness
      * to handling the connection with a sleep(). This means
      * the client won't see a server connection response for ten seconds (default).
-     * 
      */
+	// @overriding run() method in Java Thread class is deliberate
+	@Override 
     public void run()
     {
         try
@@ -43,24 +44,20 @@ public class HandlerThread extends Thread
             // get the connection output stream, then wait a period
             // of time. 
              OutputStream os = socket.getOutputStream();
-             PrintStream ps = new PrintStream(os);
+              PrintStream ps = new PrintStream(os);
 
-			 final long TIMEOUT = 10000; // 10000
+			 final long TIMEOUT = 10000; // 10000 milliseconds
 			 System.out.println("Server: pausing for TIMEOUT=" + TIMEOUT + "ms"); // debug
              Thread.sleep(TIMEOUT); // 10 seconds
                 
             ps.println("This was written by the server");
             ps.flush();
             socket.close();
-            System.out.println("Finished handling a thread");
+            System.out.println("Finished handling a thread, HandlerThread exit");
         }
-        catch(Exception e)
+        catch(IOException | InterruptedException e) // either a networking or a threading problem
         {
             System.out.println(e);
         }
-        
     }
-
-
-    
 }

projects/TcpExample4/TcpThreadServer/TcpThreadServer/src/tcpthreadserver/TcpThreadServer.java

-
 package tcpthreadserver;
 
-import java.io.*;
+import java.io.IOException;
 import java.net.*;
 
 /**
@@ -11,29 +10,27 @@ import java.net.*;
  * @author mcgredo
  */
 public class TcpThreadServer {
-
     
-    public static void main(String[] args) 
+    public static void main(String[] args) // execution starts here
     {
       try
         {
             ServerSocket serverSocket = new ServerSocket(2317);
             
-            while(true)
+            while(true) // infinite loop
             {
+				System.out.println("TcpThreadServer ready to accept socket connection...");
                 Socket clientConnection = serverSocket.accept(); // block until connected
 
                 HandlerThread handlerThread = new HandlerThread(clientConnection);
                 handlerThread.start(); // invokesthe run() method in that object
-            }
-                        
+				System.out.println("TcpThreadServer handlerThread is complete");
+            }          
         }
-        catch(Exception e)
+        catch(IOException e)
         {
             System.out.println("problem with networking");
             System.out.println("Error: " + e);
         }
-
     }
-    
 }