diff --git a/threads/FastSimulation.java b/threads/FastSimulation.java
deleted file mode 100644
index f0af5dbe..00000000
--- a/threads/FastSimulation.java
+++ /dev/null
@@ -1,82 +0,0 @@
-// threads/FastSimulation.java
-// (c)2016 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
-import java.util.concurrent.*;
-import java.util.concurrent.atomic.*;
-import java.util.*;
-
-public class FastSimulation {
-  static final int N_ELEMENTS = 100000;
-  static final int N_GENES = 30;
-  static final int N_EVOLVERS = 50;
-  static final AtomicInteger[][] GRID =
-    new AtomicInteger[N_ELEMENTS][N_GENES];
-  static SplittableRandom rand = new SplittableRandom(47);
-  private static volatile boolean running = true;
-  public static void stop() { running = false; }
-  static class Evolver implements Runnable {
-    @Override
-    public void run() {
-      while(running) {
-        // Randomly select an element to work on:
-        int element = rand.nextInt(N_ELEMENTS);
-        for(int i = 0; i < N_GENES; i++) {
-          int previous = element - 1;
-          if(previous < 0) previous = N_ELEMENTS - 1;
-          int next = element + 1;
-          if(next >= N_ELEMENTS) next = 0;
-          int oldvalue = GRID[element][i].get();
-          // Perform some kind of modeling calculation:
-          int newvalue = oldvalue +
-            GRID[previous][i].get() + GRID[next][i].get();
-          newvalue /= 3; // Average the three values
-          if(!GRID[element][i]
-            .compareAndSet(oldvalue, newvalue)) {
-            // Policy here to deal with failure. Here, we
-            // just report it and ignore it; our model
-            // will eventually deal with it.
-            System.out.println(
-              "Old value changed from " + oldvalue);
-          }
-        }
-      }
-    }
-  }
-  public static void
-  main(String[] args) throws Exception {
-    ExecutorService es = Executors.newCachedThreadPool();
-    for(int i = 0; i < N_ELEMENTS; i++)
-      for(int j = 0; j < N_GENES; j++)
-        GRID[i][j] =
-          new AtomicInteger(rand.nextInt(1000));
-    for(int i = 0; i < N_EVOLVERS; i++)
-      es.execute(new Evolver());
-    TimeUnit.SECONDS.sleep(4);
-    FastSimulation.stop();
-    es.shutdownNow();
-  }
-}
-/* Output: (First and last 10 Lines)
-Old value changed from 542
-Old value changed from 447
-Old value changed from 446
-Old value changed from 643
-Old value changed from 419
-Old value changed from 573
-Old value changed from 668
-Old value changed from 710
-Old value changed from 800
-Old value changed from 406
-________...________...________...________...________
-Old value changed from 458
-Old value changed from 436
-Old value changed from 475
-Old value changed from 501
-Old value changed from 526
-Old value changed from 465
-Old value changed from 467
-Old value changed from 368
-Old value changed from 404
-Old value changed from 428
-*/
diff --git a/threads/ThreadLocalVariableHolder.java b/threads/ThreadLocalVariableHolder.java
deleted file mode 100644
index 2df98df5..00000000
--- a/threads/ThreadLocalVariableHolder.java
+++ /dev/null
@@ -1,71 +0,0 @@
-// threads/ThreadLocalVariableHolder.java
-// (c)2016 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
-// Automatically giving each thread its own storage
-import java.util.concurrent.*;
-import java.util.*;
-
-class Accessor implements Runnable {
-  private final int id;
-  public Accessor(int idn) { id = idn; }
-  @Override
-  public void run() {
-    while(!Thread.currentThread().isInterrupted()) {
-      ThreadLocalVariableHolder.increment();
-      System.out.println(this);
-      Thread.yield();
-    }
-  }
-  @Override
-  public String toString() {
-    return "#" + id + ": " +
-      ThreadLocalVariableHolder.get();
-  }
-}
-
-public class ThreadLocalVariableHolder {
-  private static ThreadLocal<Integer> value =
-    new ThreadLocal<Integer>() {
-      private SplittableRandom rand = new SplittableRandom(47);
-      @Override
-      protected synchronized Integer initialValue() {
-        return rand.nextInt(10000);
-      }
-    };
-  public static void increment() {
-    value.set(value.get() + 1);
-  }
-  public static int get() { return value.get(); }
-  public static void
-  main(String[] args) throws Exception {
-    ExecutorService es = Executors.newCachedThreadPool();
-    for(int i = 0; i < 5; i++)
-      es.execute(new Accessor(i));
-    TimeUnit.SECONDS.sleep(3);  // Run for a while
-    es.shutdownNow();         // All Accessors will quit
-  }
-}
-/* Output: (First and last 10 Lines)
-#2: 9259
-#1: 962
-#3: 1862
-#4: 6694
-#0: 556
-#4: 6695
-#4: 6696
-#3: 1863
-#1: 963
-#2: 9260
-________...________...________...________...________
-#3: 3791
-#2: 11096
-#4: 8402
-#4: 8403
-#2: 11097
-#3: 3792
-#0: 2637
-#1: 3032
-#4: 8404
-#2: 11098
-*/