made the variable volatile

Author: Ram swaroop

src/me/ramswaroop/threads/NamePrint.java

@@ -12,7 +12,7 @@
 public class NamePrint {
 
     Object lock = new Object();
-    boolean isFirstNamePrinted = false;
+    volatile boolean isFirstNamePrinted = false;
 
     class PrintFirstName implements Runnable {
         @Override