[BAEL-10839] - Added missed class and moved articles related to hashcode and equals

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)

core-java-lang/src/test/java/com/baeldung/immutableobjects/ImmutableObjectsUnitTest.java

@@ -1,36 +0,0 @@
-package com.baeldung.immutableobjects;
-
-import static org.junit.Assert.assertEquals;
-
-import java.util.ArrayList;
-import java.util.List;
-
-import org.junit.Test;
-
-public class ImmutableObjectsUnitTest {
-
-    @Test
-    public void whenCallingStringReplace_thenStringDoesNotMutate() {
-        // 2. What's an Immutable Object?
-        final String name = "baeldung";
-        final String newName = name.replace("dung", "----");
-
-        assertEquals("baeldung", name);
-        assertEquals("bael----", newName);
-    }
-
-    public void whenReassignFinalValue_thenCompilerError() {
-        // 3. The final Keyword in Java (1)
-        final String name = "baeldung";
-        // name = "bael...";
-    }
-
-    @Test
-    public void whenAddingElementToList_thenSizeChange() {
-        // 3. The final Keyword in Java (2)
-        final List<String> strings = new ArrayList<>();
-        assertEquals(0, strings.size());
-        strings.add("baeldung");
-        assertEquals(1, strings.size());
-    }
-}