Added book reference to singleton enum implementation.

iluwatar · iluwatar · commit baf177a81eda · 2014-11-26T22:41:44.000+02:00
diff --git a/singleton/src/main/java/com/iluwatar/EnumIvoryTower.java b/singleton/src/main/java/com/iluwatar/EnumIvoryTower.java
@@ -3,9 +3,11 @@
 /**
  *
  * Enum Singleton class.
+ * Effective Java 2nd Edition (Joshua Bloch) p. 18
  *
  */
 public enum EnumIvoryTower {
+	
     INSTANCE;
 
     @Override

Original file line number	Diff line number	Diff line change
`@@ -3,9 +3,11 @@`
`3`	`3`	`/**`
`4`	`4`	`*`
`5`	`5`	`* Enum Singleton class.`
	`6`	`+ * Effective Java 2nd Edition (Joshua Bloch) p. 18`
`6`	`7`	`*`
`7`	`8`	`*/`
`8`	`9`	`public enum EnumIvoryTower {`
	`10`	`+`
`9`	`11`	`INSTANCE;`
`10`	`12`
`11`	`13`	`@Override`