TDD

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

                 "we were all going direct the other way--\n" +
                 "in short, the period was so far like the present period, that some of\n" +
                 "its noisiest authorities insisted on its being received, for good or for\n" +
-                "evil, in the superlative degree of comparison only.";
+                "evil, in the superlative degree of comparison only. ";
 
         // 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 unsafe = new UnsafeCopier(introduction);
+        SafeCopier safe = new SafeCopier(introduction);
+
+        for (int i = 0; i < 5; i++) {
+            new Thread(unsafe).start();
+        }
+
+        for (int i = 0; i < 5; i++) {
+            new Thread(safe).start();
+        }
 
         // This wait is here because main is still a thread and we want the main method to print the finished copies
         // after enough time has passed.
         }
 
         // Print out the copied versions here.
+        System.out.println(unsafe.copied);
+        if (unsafe.copied.equals(introduction)) {
+            System.out.println("UNSAFE PASS");
+        } else {
+            System.out.println("UNSAFE FAIL");
+        }
+        System.out.println(safe.copied);
+        if (safe.copied.equals(introduction)) {
+            System.out.println("SAFE PASS");
+        } else {
+            System.out.println("SAFE FAIL");
+        }
     }
 }

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

  * 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 {
+
+    public SafeCopier(String text) {
+        super(text);
+    }
+
+    synchronized public void run() {
+        while (this.stringIterator.hasNext()) {
+            copied += stringIterator.next() + " ";
+        }
+    }
 }

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

     }
 
     public void run() {
+        while (this.stringIterator.hasNext()) {
+           copied += stringIterator.next() + " ";
+        }
     }
 }