completed

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

@@ -23,16 +23,33 @@ 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 unSafe = new UnsafeCopier(introduction);
+        new Thread(unSafe).start();
+        new Thread(unSafe).start();
+        new Thread(unSafe).start();
+        new Thread(unSafe).start();
+        new Thread(unSafe).start();
 
+        SafeCopier safeCopier = new SafeCopier(introduction);
+        new Thread(safeCopier).start();
+        new Thread(safeCopier).start();
+        new Thread(safeCopier).start();
+        new Thread(safeCopier).start();
+        new Thread(safeCopier).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.
         try {
-            Thread.sleep(1000);
-        } catch(InterruptedException e) {
+            Thread.sleep(100);
+        } catch (InterruptedException e) {
             System.out.println("MAIN INTERRUPTED");
         }
 
         // Print out the copied versions here.
+        System.out.println("Unsafe Copy:\n");
+        System.out.println(unSafe.copied+"\n\n");
+
+        System.out.println("Safe Copy: \n");
+        System.out.println(safeCopier.copied+"\n\n");
     }
 }

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

@@ -1,8 +1,38 @@
 package io.zipcoder;
 
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReadWriteLock;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+
 /**
  * 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 UnsafeCopier {
+
+    ReadWriteLock lock;
+    public SafeCopier(String toCopy) {
+        super(toCopy);
+        lock = new ReentrantReadWriteLock();
+    }
+
+
+
+
+    public void run() {
+        lock.writeLock().lock();
+        lock.readLock().lock();
+        try
+        {
+            while(stringIterator.hasNext()){
+                copied += stringIterator.next() + " ";
+            }
+        }
+        finally
+        {
+            lock.readLock().unlock();
+            lock.writeLock().unlock();
+        }
+
+    }
 }

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

@@ -10,5 +10,8 @@ public class UnsafeCopier extends Copier {
     }
 
     public void run() {
+        while(stringIterator.hasNext()){
+            copied += stringIterator.next() + " ";
+        }
     }
 }