diff --git a/core-java-lang-oop/README.md b/core-java-lang-oop/README.md
index 665178452c..3531ab9677 100644
--- a/core-java-lang-oop/README.md
+++ b/core-java-lang-oop/README.md
@@ -20,4 +20,6 @@
 - [Guide to the this Java Keyword](http://www.baeldung.com/java-this)
 - [Immutable Objects in Java](http://www.baeldung.com/java-immutable-object)
 - [Inheritance and Composition (Is-a vs Has-a relationship) in Java](http://www.baeldung.com/java-inheritance-composition)
-- [A Guide to Constructors in Java](https://www.baeldung.com/java-constructors)
\ No newline at end of file
+- [A Guide to Constructors in Java](https://www.baeldung.com/java-constructors)
+- [Generate equals() and hashCode() with Eclipse](http://www.baeldung.com/java-eclipse-equals-and-hashcode)
+- [Java equals() and hashCode() Contracts](https://www.baeldung.com/java-equals-hashcode-contracts)
\ No newline at end of file
diff --git a/core-java-lang/src/test/java/com/baeldung/immutableobjects/ImmutableObjectsUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/immutableobjects/ImmutableObjectsUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/immutableobjects/ImmutableObjectsUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/immutableobjects/ImmutableObjectsUnitTest.java
diff --git a/core-java-lang/README.md b/core-java-lang/README.md
index 56de6d2e82..68cd7ce452 100644
--- a/core-java-lang/README.md
+++ b/core-java-lang/README.md
@@ -5,7 +5,6 @@
 ### Relevant Articles: 
 - [Guide to Java Reflection](http://www.baeldung.com/java-reflection)
 - [Introduction to Java Generics](http://www.baeldung.com/java-generics)
-- [Generate equals() and hashCode() with Eclipse](http://www.baeldung.com/java-eclipse-equals-and-hashcode)
 - [Chained Exceptions in Java](http://www.baeldung.com/java-chained-exceptions)
 - [Java Primitive Conversions](http://www.baeldung.com/java-primitive-conversions)
 - [Call Methods at Runtime Using Java Reflection](http://www.baeldung.com/java-method-reflection)
@@ -40,4 +39,3 @@
 - [How to Separate Double into Integer and Decimal Parts](https://www.baeldung.com/java-separate-double-into-integer-decimal-parts)
 - [“Sneaky Throws” in Java](http://www.baeldung.com/java-sneaky-throws)
 - [Retrieving a Class Name in Java](https://www.baeldung.com/java-class-name)
-- [Java equals() and hashCode() Contracts](https://www.baeldung.com/java-equals-hashcode-contracts)