add some references to class comments

mortezaadi · mortezaadi · commit c06c05757e0f · 2014-12-05T11:59:41.000+03:30
diff --git a/singleton/src/main/java/com/iluwatar/InitializingOnDemandHolderIdiom.java b/singleton/src/main/java/com/iluwatar/InitializingOnDemandHolderIdiom.java
@@ -3,6 +3,13 @@
 import java.io.Serializable;
 
 /**
+ * The Initialize-on-demand-holder idiom is a secure way of 
+ * creating lazy initialize singleton Object in Java.
+ * refer to "The CERT Oracle Secure Coding Standard for Java"
+ * By Dhruv Mohindra, Robert C. Seacord p.378
+ * 
+ * Singleton objects usually are heavy to create and sometimes need to serialize them.
+ * This class also shows how to preserve singleton in Serialized version of singleton.
  * 
  * @author mortezaadi@gmail.com
  *
diff --git a/singleton/src/main/java/com/iluwatar/ThreadSafeDoubleCheckLocking.java b/singleton/src/main/java/com/iluwatar/ThreadSafeDoubleCheckLocking.java
@@ -1,6 +1,10 @@
 package com.iluwatar;
 
 /**
+ * Double check locking
+ * 
+ * http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html
+ * 
  * Broken under Java 1.4.
  * @author mortezaadi@gmail.com
  *

Original file line number	Diff line number	Diff line change
`@@ -3,6 +3,13 @@`
`3`	`3`	`import java.io.Serializable;`
`4`	`4`
`5`	`5`	`/**`
	`6`	`+ * The Initialize-on-demand-holder idiom is a secure way of`
	`7`	`+ * creating lazy initialize singleton Object in Java.`
	`8`	`+ * refer to "The CERT Oracle Secure Coding Standard for Java"`
	`9`	`+ * By Dhruv Mohindra, Robert C. Seacord p.378`
	`10`	`+ *`
	`11`	`+ * Singleton objects usually are heavy to create and sometimes need to serialize them.`
	`12`	`+ * This class also shows how to preserve singleton in Serialized version of singleton.`
`6`	`13`	`*`
`7`	`14`	`* @author mortezaadi@gmail.com`
`8`	`15`	`*`