diff --git a/check.bat b/check.bat
index c250560b..25446ee4 100644
--- a/check.bat
+++ b/check.bat
@@ -1,2 +1,2 @@
 cp ..\..\OnJava-Tools\verify_output.py .
-python verify_output.py
+py -3 verify_output.py
diff --git a/collectiontopics/CollectionMethods.java b/collectiontopics/CollectionMethods.java
index 6c6ae7f1..1bf8691e 100644
--- a/collectiontopics/CollectionMethods.java
+++ b/collectiontopics/CollectionMethods.java
@@ -79,10 +79,10 @@ Aquamarine
 Azure
 ten
 eleven
-------------------------------
+******************************
 Collections.max(c) = ten
 Collections.min(c) = AliceBlue
-------------------------------
+******************************
 AliceBlue
 AntiqueWhite
 Aquamarine
@@ -93,7 +93,7 @@ Brown
 BurlyWood
 CadetBlue
 Chartreuse
-------------------------------
+******************************
 AntiqueWhite
 Aquamarine
 Azure
@@ -103,13 +103,13 @@ Brown
 BurlyWood
 CadetBlue
 Chartreuse
-------------------------------
+******************************
 AntiqueWhite
 Aquamarine
 Azure
 ten
 eleven
-------------------------------
+******************************
 AntiqueWhite
 Aquamarine
 Azure
@@ -119,11 +119,11 @@ Brown
 BurlyWood
 CadetBlue
 Chartreuse
-------------------------------
+******************************
 c.contains(Azure) = true
 c.containsAll(c2) = true
 c2.isEmpty() = true
-------------------------------
+******************************
 PapayaWhip
 PeachPuff
 Peru
diff --git a/collectiontopics/HTMLColorTest.java b/collectiontopics/HTMLColorTest.java
index 47418db0..517ee575 100644
--- a/collectiontopics/HTMLColorTest.java
+++ b/collectiontopics/HTMLColorTest.java
@@ -37,7 +37,7 @@ public class HTMLColorTest {
 0xFFF8DC: Cornsilk
 0xDC143C: Crimson
 0x00FFFF: Cyan
-------------------------------
+******************************
 AliceBlue             0xF0F8FF
 AntiqueWhite          0xFAEBD7
 Aquamarine            0x7FFFD4
@@ -58,7 +58,7 @@ CornflowerBlue        0x6495ED
 Cornsilk              0xFFF8DC
 Crimson               0xDC143C
 Cyan                  0x00FFFF
-------------------------------
+******************************
 AliceBlue
 AntiqueWhite
 Aquamarine
@@ -79,7 +79,7 @@ CornflowerBlue
 Cornsilk
 Crimson
 Cyan
-------------------------------
+******************************
 0xF0F8FF
 0xFAEBD7
 0x7FFFD4
diff --git a/collectiontopics/NavMap.java b/collectiontopics/NavMap.java
index 92e4ef19..0f682b8a 100644
--- a/collectiontopics/NavMap.java
+++ b/collectiontopics/NavMap.java
@@ -35,9 +35,9 @@ public class NavMap {
 }
 /* Output:
 0x000000: Black
-------------------------------
+******************************
 0xFFFFFF: White
-------------------------------
+******************************
 0x000000: Black
 0x000080: Navy
 0x00008B: DarkBlue
@@ -51,11 +51,11 @@ public class NavMap {
 0x00CED1: DarkTurquoise
 0x00FA9A: MediumSpringGreen
 0x00FF00: Lime
-------------------------------
+******************************
 0x00BFFF: DeepSkyBlue
-------------------------------
+******************************
 0x008B8B: DarkCyan
-------------------------------
+******************************
 0x00FF00: Lime
 0x00FA9A: MediumSpringGreen
 0x00CED1: DarkTurquoise
@@ -69,7 +69,7 @@ public class NavMap {
 0x00008B: DarkBlue
 0x000080: Navy
 0x000000: Black
-------------------------------
+******************************
 0xFFE4E1: MistyRose
 0xFFEBCD: BlanchedAlmond
 0xFFEFD5: PapayaWhip
@@ -83,7 +83,7 @@ public class NavMap {
 0xFFFFE0: LightYellow
 0xFFFFF0: Ivory
 0xFFFFFF: White
-------------------------------
+******************************
 0xDA70D6: Orchid
 0xDAA520: GoldenRod
 0xDB7093: PaleVioletRed
diff --git a/enums/menu/Meal.java b/enums/menu/Meal.java
index adfe92a6..f83a3002 100644
--- a/enums/menu/Meal.java
+++ b/enums/menu/Meal.java
@@ -12,7 +12,7 @@ public class Meal {
         Food food = course.randomSelection();
         System.out.println(food);
       }
-      System.out.println("---");
+      System.out.println("***");
     }
   }
 }
@@ -21,25 +21,25 @@ SALAD
 VINDALOO
 GELATO
 CAPPUCCINO
----
+***
 SPRING_ROLLS
 BURRITO
 GELATO
 HERB_TEA
----
+***
 SPRING_ROLLS
 BURRITO
 TIRAMISU
 CAPPUCCINO
----
+***
 SPRING_ROLLS
 BURRITO
 BLACK_FOREST_CAKE
 LATTE
----
+***
 SALAD
 PAD_THAI
 GELATO
 TEA
----
+***
 */
diff --git a/enums/menu/Meal2.java b/enums/menu/Meal2.java
index 5d63b54f..ef0c3873 100644
--- a/enums/menu/Meal2.java
+++ b/enums/menu/Meal2.java
@@ -41,7 +41,7 @@ public enum Meal2 {
         Food food = meal.randomSelection();
         System.out.println(food);
       }
-      System.out.println("---");
+      System.out.println("***");
     }
   }
 }
@@ -50,25 +50,25 @@ SALAD
 VINDALOO
 GELATO
 CAPPUCCINO
----
+***
 SPRING_ROLLS
 BURRITO
 GELATO
 HERB_TEA
----
+***
 SPRING_ROLLS
 BURRITO
 TIRAMISU
 CAPPUCCINO
----
+***
 SPRING_ROLLS
 BURRITO
 BLACK_FOREST_CAKE
 LATTE
----
+***
 SALAD
 PAD_THAI
 GELATO
 TEA
----
+***
 */
diff --git a/network/ChatterClient.java b/network/ChatterClient.java
deleted file mode 100644
index 78b51f31..00000000
--- a/network/ChatterClient.java
+++ /dev/null
@@ -1,49 +0,0 @@
-// network/ChatterClient.java
-// (c)2017 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://OnJava8.com for more book information.
-// Starts multiple clients, each of which sends datagrams.
-import java.net.*;
-import java.io.*;
-
-public class ChatterClient implements Runnable {
-  private InetAddress host;
-  private byte[] buf = new byte[1000];
-  private DatagramPacket dp =
-    new DatagramPacket(buf, buf.length);
-  private static int counter = 0;
-  private int id = counter++;
-
-  public ChatterClient(InetAddress host) {
-    this.host = host;
-    System.out.println(
-      "ChatterClient #" + id + " starting");
-  }
-  public void sendAndEcho(String msg) {
-    try (
-      // Auto-assign port number:
-      DatagramSocket s = new DatagramSocket();
-    ) {
-      // Make and send a datagram:
-      s.send(Dgram.toDatagram(
-        msg, host, ChatterServer.INPORT));
-      // Block until it echoes back:
-      s.receive(dp);
-      // Display the echoed contents:
-      String rcvd = "Client #" + id +
-        ", rcvd from " +
-        dp.getAddress() + ", " +
-        dp.getPort() + ": " +
-        Dgram.toString(dp);
-      System.out.println(rcvd);
-    } catch(IOException e) {
-      throw new RuntimeException(e);
-    }
-  }
-  @Override
-  public void run() {
-    for(int i = 0; i < 10; i++)
-      sendAndEcho(
-        "Client #" + id + ", message #" + i);
-  }
-}
diff --git a/network/ChatterServer.java b/network/ChatterServer.java
deleted file mode 100644
index 11b3c6b1..00000000
--- a/network/ChatterServer.java
+++ /dev/null
@@ -1,41 +0,0 @@
-// network/ChatterServer.java
-// (c)2017 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://OnJava8.com for more book information.
-// A server that echoes datagrams
-import java.net.*;
-import java.io.*;
-
-public class ChatterServer implements Runnable {
-  static final int INPORT = 1711;
-  private byte[] buf = new byte[1000];
-  private DatagramPacket dp =
-    new DatagramPacket(buf, buf.length);
-  @Override
-  public void run() {
-    // Can listen & send on the same socket:
-    try (
-      DatagramSocket socket = new DatagramSocket(INPORT)
-    ) {
-      System.out.println("Server started");
-      while(true) {
-        // Block until a datagram appears:
-        socket.receive(dp);
-        String rcvd = Dgram.toString(dp) +
-          ", from address: " + dp.getAddress() +
-          ", port: " + dp.getPort();
-        System.out.println(rcvd);
-        String echoString =
-          "Echoed: " + rcvd;
-        // Extract address and port from received
-        // datagram and send it back there:
-        DatagramPacket echo =
-          Dgram.toDatagram(echoString,
-            dp.getAddress(), dp.getPort());
-        socket.send(echo);
-      }
-    } catch(IOException e) {
-      throw new RuntimeException(e);
-    }
-  }
-}
diff --git a/network/Dgram.java b/network/Dgram.java
deleted file mode 100644
index 9fbd774d..00000000
--- a/network/Dgram.java
+++ /dev/null
@@ -1,19 +0,0 @@
-// network/Dgram.java
-// (c)2017 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://OnJava8.com for more book information.
-// Converts between Strings and DataGramPackets
-import java.net.*;
-
-public class Dgram {
-  public static DatagramPacket toDatagram(
-    String s, InetAddress destIA, int destPort) {
-    byte[] buf = s.getBytes();
-    return new DatagramPacket(buf, buf.length,
-      destIA, destPort);
-  }
-  public static String toString(DatagramPacket p) {
-    return
-      new String(p.getData(), 0, p.getLength());
-  }
-}
diff --git a/network/Local.java b/network/Local.java
deleted file mode 100644
index 35202670..00000000
--- a/network/Local.java
+++ /dev/null
@@ -1,15 +0,0 @@
-// network/Local.java
-// (c)2017 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://OnJava8.com for more book information.
-import java.net.*;
-
-public class Local {
-  public static InetAddress host() {
-    try {
-      return InetAddress.getByName(null);
-    } catch(UnknownHostException e) {
-      throw new RuntimeException(e);
-    }
-  }
-}
diff --git a/network/LocalHost.java b/network/LocalHost.java
deleted file mode 100644
index 487680a6..00000000
--- a/network/LocalHost.java
+++ /dev/null
@@ -1,27 +0,0 @@
-// network/LocalHost.java
-// (c)2017 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://OnJava8.com for more book information.
-// The local loopback IP address
-import java.net.*;
-
-public class LocalHost {
-  public static void
-  main(String[] args) throws Exception {
-    InetAddress
-      local1 = InetAddress.getByName(null),
-      local2 = InetAddress.getByName("localhost"),
-      local3 = InetAddress.getByName("127.0.0.1"),
-      local4 = InetAddress.getLoopbackAddress();
-    System.out.println(local1);
-    System.out.println(local2);
-    System.out.println(local3);
-    System.out.println(local4);
-  }
-}
-/* Output:
-localhost/127.0.0.1
-localhost/127.0.0.1
-/127.0.0.1
-localhost/127.0.0.1
-*/
diff --git a/network/MultiServer.java b/network/MultiServer.java
deleted file mode 100644
index f538ccb5..00000000
--- a/network/MultiServer.java
+++ /dev/null
@@ -1,29 +0,0 @@
-// network/MultiServer.java
-// (c)2017 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://OnJava8.com for more book information.
-// Uses concurrency to handle any number of clients.
-import java.io.*;
-import java.net.*;
-import java.util.concurrent.*;
-
-public class MultiServer implements Runnable {
-  private final int port;
-  public MultiServer(int port) {
-    this.port = port;
-  }
-  @Override
-  public void run() {
-    System.out.println("Server: Running");
-    try (
-      ServerSocket ss = new ServerSocket(port)
-    ) {
-      System.out.println("Server: " + ss);
-      for(int i = 0; i < 10; i++)
-        CompletableFuture
-          .runAsync(new SimpleServer(ss));
-    } catch(IOException e) {
-      throw new RuntimeException(e);
-    }
-  }
-}
diff --git a/network/SimpleClient.java b/network/SimpleClient.java
deleted file mode 100644
index 0cd88845..00000000
--- a/network/SimpleClient.java
+++ /dev/null
@@ -1,51 +0,0 @@
-// network/SimpleClient.java
-// (c)2017 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://OnJava8.com for more book information.
-// Sends to the server, reads from the server
-import java.net.*;
-import java.io.*;
-import java.util.concurrent.atomic.*;
-
-public class SimpleClient implements Runnable {
-  public final int port;
-  private static AtomicInteger idcount =
-    new AtomicInteger(0);
-  private final int id = idcount.getAndIncrement();
-  private InetAddress host;
-  public SimpleClient(InetAddress host, int port) {
-    this.host = host;
-    this.port = port;
-  }
-  @Override
-  public String toString() {
-    return "Client[" + id + "]: ";
-  }
-  @Override
-  public void run() {
-    System.out.println(this + "Running");
-    try(
-      Socket socket = new Socket(host, port);
-      BufferedReader in =
-        new BufferedReader(
-          new InputStreamReader(
-            socket.getInputStream()));
-      PrintWriter out =
-        new PrintWriter(
-          new BufferedWriter(
-            new OutputStreamWriter(
-              // Enable auto-flush:
-              socket.getOutputStream())), true);
-    ) {
-      System.out.println(this.toString() + socket);
-      for(int i = 0; i < 10; i ++) {
-        out.println(this + "(*" + i + "*)");
-        System.out.println(this +
-          "Received '" + in.readLine() + "'");
-      }
-      out.println("END");
-    } catch(IOException e) {
-      throw new RuntimeException(e);
-    }
-  }
-}
diff --git a/network/SimpleServer.java b/network/SimpleServer.java
deleted file mode 100644
index 56e0cf36..00000000
--- a/network/SimpleServer.java
+++ /dev/null
@@ -1,47 +0,0 @@
-// network/SimpleServer.java
-// (c)2017 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://OnJava8.com for more book information.
-// Echoes what the client sends.
-import java.io.*;
-import java.net.*;
-
-public class SimpleServer implements Runnable {
-  private ServerSocket ss;
-  public SimpleServer(ServerSocket ss) {
-    this.ss = ss;
-  }
-  @Override
-  public String toString() { return "Server: "; }
-  @Override
-  public void run() {
-    System.out.println(this + "Running");
-    try (
-      // Blocks until a connection occurs:
-      Socket socket = ss.accept();
-      BufferedReader in =
-        new BufferedReader(
-          new InputStreamReader(
-            socket.getInputStream()));
-      PrintWriter out =
-        new PrintWriter(
-          new BufferedWriter(
-            new OutputStreamWriter(
-              // Boolean enables auto-flush:
-              socket.getOutputStream())), true)
-    ) {
-      System.out.println(this.toString() + socket);
-      in.lines().anyMatch(message -> {
-        if(message.equals("END")) {
-          System.out.println(this +
-            "Received END. Closing Socket.");
-          return true;
-        }
-        out.println(this + message);
-        return false;
-      });
-    } catch(IOException e) {
-      throw new RuntimeException(e);
-    }
-  }
-}
diff --git a/network/TestChatter.java b/network/TestChatter.java
deleted file mode 100644
index b801bf7b..00000000
--- a/network/TestChatter.java
+++ /dev/null
@@ -1,18 +0,0 @@
-// network/TestChatter.java
-// (c)2017 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://OnJava8.com for more book information.
-import java.util.concurrent.*;
-import java.net.*;
-import onjava.Nap;
-
-public class TestChatter {
-  public static void main(String[] args) {
-    CompletableFuture.runAsync(
-      new ChatterServer());
-    CompletableFuture.runAsync(
-      new ChatterClient(Local.host()));
-    new Nap(1);
-    // No exceptions means success
-  }
-}
diff --git a/network/TestMultiServer.java b/network/TestMultiServer.java
deleted file mode 100644
index cd68e23c..00000000
--- a/network/TestMultiServer.java
+++ /dev/null
@@ -1,22 +0,0 @@
-// network/TestMultiServer.java
-// (c)2017 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://OnJava8.com for more book information.
-import java.net.*;
-import java.util.concurrent.*;
-import onjava.Nap;
-
-public class TestMultiServer {
-  public static final int port = 8080;
-  public static void main(String[] args) {
-    CompletableFuture.runAsync(
-      new MultiServer(port));
-    new Nap(1); // Let the server get started
-    for(int i = 0; i < 10; i++) {
-      CompletableFuture.runAsync(
-        new SimpleClient(Local.host(), port));
-    }
-    new Nap(4);
-    // No exceptions mean success
-  }
-}
diff --git a/network/TestSimpleServer.java b/network/TestSimpleServer.java
deleted file mode 100644
index 99f3ca55..00000000
--- a/network/TestSimpleServer.java
+++ /dev/null
@@ -1,28 +0,0 @@
-// network/TestSimpleServer.java
-// (c)2017 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://OnJava8.com for more book information.
-import java.io.*;
-import java.net.*;
-import java.util.concurrent.*;
-import onjava.Nap;
-
-public class TestSimpleServer {
-  // Choose a port outside of the range 1-1024:
-  public static final int port = 8080;
-  public static void main(String[] args) {
-    try (
-      ServerSocket ss =
-        new ServerSocket(port)
-    ) {
-      CompletableFuture.runAsync(
-        new SimpleServer(ss));
-      CompletableFuture.runAsync(
-        new SimpleClient(Local.host(), port));
-      new Nap(1);
-      // Success if no exceptions happen
-    } catch(IOException e) {
-      throw new RuntimeException(e);
-    }
-  }
-}
diff --git a/network/WhoAmI.java b/network/WhoAmI.java
deleted file mode 100644
index c636a7cc..00000000
--- a/network/WhoAmI.java
+++ /dev/null
@@ -1,19 +0,0 @@
-// network/WhoAmI.java
-// (c)2017 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://OnJava8.com for more book information.
-// Discovers your machine name and network address.
-import java.net.*;
-
-public class WhoAmI {
-  public static void
-  main(String[] args) throws UnknownHostException {
-    InetAddress whoami = InetAddress.getLocalHost();
-    System.out.println(whoami.getHostName());
-    System.out.println(whoami.getHostAddress());
-  }
-}
-/* Output:
-MindviewToshibaLaptop
-192.168.0.104
-*/
diff --git a/onjava/HTMLColors.java b/onjava/HTMLColors.java
index 0f773983..c595e8b4 100644
--- a/onjava/HTMLColors.java
+++ b/onjava/HTMLColors.java
@@ -230,6 +230,7 @@ public class HTMLColors {
     showInv(m, m.size());
   }
   public static void border() {
-    System.out.println("------------------------------");
+    System.out.println(
+      "******************************");
   }
 }
diff --git a/patterns/SingletonPattern.java b/patterns/SingletonPattern.java
new file mode 100644
index 00000000..83163982
--- /dev/null
+++ b/patterns/SingletonPattern.java
@@ -0,0 +1,58 @@
+// patterns/SingletonPattern.java
+// (c)2017 MindView LLC: see Copyright.txt
+// We make no guarantees that this code is fit for any purpose.
+// Visit http://OnJava8.com for more book information.
+
+interface Resource {
+  int getValue();
+  void setValue(int x);
+}
+
+// Since this isn't inherited from a Cloneable
+// base class and cloneability isn't added,
+// making it final prevents cloneability from
+// being added through inheritance. This also
+// implements thread-safe lazy initialization:
+
+final class Singleton {
+  private static class
+  ResourceImpl implements Resource {
+    private int i;
+    private ResourceImpl(int i) {
+      this.i = i;
+    }
+    public synchronized int getValue() {
+      return i;
+    }
+    public synchronized void setValue(int x) {
+      i = x;
+    }
+  }
+  private static class ResourceHolder {
+    private static Resource resource =
+      new ResourceImpl(47);
+  }
+  public static Resource getResource() {
+    return ResourceHolder.resource;
+  }
+}
+
+public class SingletonPattern {
+  public static void main(String[] args) {
+    Resource r = Singleton.getResource();
+    System.out.println(r.getValue());
+    Resource s2 = Singleton.getResource();
+    s2.setValue(9);
+    System.out.println(r.getValue());
+    try {
+      // Can't do this: compile-time error.
+      // Singleton s3 = (Singleton)s2.clone();
+    } catch(Exception e) {
+      throw new RuntimeException(e);
+    }
+  }
+}
+/* Output:
+47
+9
+*/
diff --git a/references/LocalCopy.java b/references/LocalCopy.java
new file mode 100644
index 00000000..60175c7c
--- /dev/null
+++ b/references/LocalCopy.java
@@ -0,0 +1,57 @@
+// references/LocalCopy.java
+// (c)2017 MindView LLC: see Copyright.txt
+// We make no guarantees that this code is fit for any purpose.
+// Visit http://OnJava8.com for more book information.
+// Creating local copies with clone()
+
+class Duplo implements Cloneable {
+  private int n;
+  public Duplo(int n) { this.n = n; }
+  @Override
+  public Duplo clone() { // [1]
+    try {
+      return (Duplo)super.clone();
+    } catch(CloneNotSupportedException e) {
+      throw new RuntimeException(e);
+    }
+  }
+  public int getValue() { return n; }
+  public void setValue(int n) { this.n = n; }
+  public void increment() { n++; }
+  @Override
+  public String toString() {
+    return Integer.toString(n);
+  }
+}
+
+public class LocalCopy {
+  public static Duplo g(Duplo v) {
+    // Passing a reference, modifies outside object:
+    v.increment();
+    return v;
+  }
+  public static Duplo f(Duplo v) {
+    v = v.clone(); // [2] Local copy
+    v.increment();
+    return v;
+  }
+  public static void main(String[] args) {
+    Duplo a = new Duplo(11);
+    Duplo b = g(a);
+    // Reference equivalence, not object equivalence:
+    System.out.println("a == b: " + (a == b) +
+      "\na = " + a + "\nb = " + b);
+    Duplo c = new Duplo(47);
+    Duplo d = f(c);
+    System.out.println("c == d: " + (c == d) +
+      "\nc = " + c + "\nd = " + d);
+  }
+}
+/* Output:
+a == b: true
+a = 12
+b = 12
+c == d: false
+c = 47
+d = 48
+*/
diff --git a/remote/DisplayPerfectTime.java b/remote/DisplayPerfectTime.java
deleted file mode 100644
index c3556b32..00000000
--- a/remote/DisplayPerfectTime.java
+++ /dev/null
@@ -1,21 +0,0 @@
-// remote/DisplayPerfectTime.java
-// (c)2017 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://OnJava8.com for more book information.
-// Uses remote object PerfectTime
-// {ValidateByHand}
-package remote;
-import java.rmi.registry.*;
-
-public class DisplayPerfectTime {
-  public static void
-  main(String[] args) throws Exception {
-    Registry reg =
-      LocateRegistry.getRegistry("localhost");
-    PerfectTime pt =
-      (PerfectTime)reg.lookup("PerfectTime");
-    for(int i = 0; i < 10; i++)
-      System.out.println(
-        "Time: "+ pt.getPerfectTime());
-  }
-}
diff --git a/remote/PerfectTime.java b/remote/PerfectTime.java
deleted file mode 100644
index 73c9c67b..00000000
--- a/remote/PerfectTime.java
+++ /dev/null
@@ -1,11 +0,0 @@
-// remote/PerfectTime.java
-// (c)2017 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://OnJava8.com for more book information.
-// The PerfectTime remote interface
-package remote;
-import java.rmi.*;
-
-public interface PerfectTime extends Remote {
-  long getPerfectTime() throws RemoteException;
-}
diff --git a/remote/PerfectTimeImpl.java b/remote/PerfectTimeImpl.java
deleted file mode 100644
index a1a91302..00000000
--- a/remote/PerfectTimeImpl.java
+++ /dev/null
@@ -1,13 +0,0 @@
-// remote/PerfectTimeImpl.java
-// (c)2017 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://OnJava8.com for more book information.
-// Implementing the PerfectTime remote object
-package remote;
-import java.rmi.RemoteException;
-
-public class PerfectTimeImpl implements PerfectTime {
-  public long getPerfectTime() throws RemoteException {
-    return System.currentTimeMillis();
-  }
-}
diff --git a/remote/PerfectTimeServer.java b/remote/PerfectTimeServer.java
deleted file mode 100644
index b466b04e..00000000
--- a/remote/PerfectTimeServer.java
+++ /dev/null
@@ -1,23 +0,0 @@
-// remote/PerfectTimeServer.java
-// (c)2017 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://OnJava8.com for more book information.
-// Server for the PerfectTime remote object
-// {ValidateByHand}
-package remote;
-import java.rmi.registry.Registry;
-import java.rmi.registry.LocateRegistry;
-import java.rmi.RemoteException;
-import java.rmi.server.UnicastRemoteObject;
-
-public class PerfectTimeServer {
-  public static void
-  main(String[] args) throws RemoteException {
-    PerfectTimeImpl pt = new PerfectTimeImpl();
-    PerfectTime stub = (PerfectTime)
-      UnicastRemoteObject.exportObject(pt, 0);
-    Registry registry = LocateRegistry.getRegistry();
-    registry.rebind("PerfectTime", stub);
-    System.out.println("Ready to do time");
-  }
-}