Done.

src/main/java/io/zipcoder/MonkeyTypewriter.java

@@ -23,6 +23,35 @@ public class MonkeyTypewriter {
         // Do all of the Monkey / Thread building here
         // For each Copier(one safe and one unsafe), create and start 5 monkeys copying the introduction to
         // A Tale Of Two Cities.
+        UnsafeCopier unsafeCopier = new UnsafeCopier(introduction);
+        Thread monkey1 = new Thread(unsafeCopier);
+        Thread monkey2 = new Thread(unsafeCopier);
+        Thread monkey3 = new Thread(unsafeCopier);
+        Thread monkey4 = new Thread(unsafeCopier);
+        Thread monkey5 = new Thread(unsafeCopier);
+
+        monkey1.start();
+        monkey2.start();
+        monkey3.start();
+        monkey4.start();
+        monkey5.start();
+
+        SafeCopier safeCopier = new SafeCopier(introduction);
+        Thread safeMonkey1 = new Thread(safeCopier);
+        Thread safeMonkey2 = new Thread(safeCopier);
+        Thread safeMonkey3 = new Thread(safeCopier);
+        Thread safeMonkey4 = new Thread(safeCopier);
+        Thread safeMonkey5 = new Thread(safeCopier);
+
+        safeMonkey1.start();
+        safeMonkey2.start();
+        safeMonkey3.start();
+        safeMonkey4.start();
+        safeMonkey5.start();
+
+
+
+       //unsafeCopier.run();
 
 
         // This wait is here because main is still a thread and we want the main method to print the finished copies
@@ -34,5 +63,9 @@ public class MonkeyTypewriter {
         }
 
         // Print out the copied versions here.
+        System.out.println(unsafeCopier.copied);
+        System.out.println("==========================================================================");
+        System.out.println(safeCopier.copied);
+
     }
 }

src/main/java/io/zipcoder/SafeCopier.java

@@ -1,8 +1,30 @@
 package io.zipcoder;
 
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
 /**
  * Make this extend the Copier like `UnsafeCopier`, except use locks to make sure that the actual intro gets printed
  * correctly every time.  Make the run method thread safe.
  */
-public class SafeCopier {
+public class SafeCopier extends Copier{
+
+    Lock monkeyLock = new ReentrantLock();
+
+    public SafeCopier(String toCopy) {
+        super(toCopy);
+    }
+
+
+    @Override
+    public void run() {
+        while(stringIterator.hasNext()){    //true until there are no more words
+            monkeyLock.lock();
+            System.out.println(Thread.currentThread().getName());
+            copied += stringIterator.next() + " ";
+            monkeyLock.unlock();
+
+        }
+
+    }
 }

src/main/java/io/zipcoder/UnsafeCopier.java

@@ -6,9 +6,17 @@ package io.zipcoder;
 public class UnsafeCopier extends Copier {
 
     public UnsafeCopier(String toCopy) {
+
         super(toCopy);
     }
 
+    @Override
     public void run() {
+        //while loop
+        while(stringIterator.hasNext()){    //true until there are no more words
+            copied += stringIterator.next() + " ";
+            //System.out.println(copied);
+        }
+
     }
 }