diff --git a/core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/classcastexception/Reptile.java b/core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/classcastexception/Amphibian.java
similarity index 75%
rename from core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/classcastexception/Reptile.java
rename to core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/classcastexception/Amphibian.java
index ed4b0273e5..cb15977cf8 100644
--- a/core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/classcastexception/Reptile.java
+++ b/core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/classcastexception/Amphibian.java
@@ -1,6 +1,6 @@
 package com.baeldung.exceptions.classcastexception;
 
-public class Reptile implements Animal {
+public class Amphibian implements Animal {
 
     @Override
     public String getName() {
diff --git a/core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/classcastexception/Frog.java b/core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/classcastexception/Frog.java
index 0a0b2d1f63..a3837f4c2f 100644
--- a/core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/classcastexception/Frog.java
+++ b/core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/classcastexception/Frog.java
@@ -1,6 +1,6 @@
 package com.baeldung.exceptions.classcastexception;
 
-public class Frog extends Reptile {
+public class Frog extends Amphibian {
 
     @Override
     public String getName() {
diff --git a/core-java-modules/core-java-exceptions-3/src/test/java/com/baeldung/exceptions/classcastexception/CheckedCastsUnitTest.java b/core-java-modules/core-java-exceptions-3/src/test/java/com/baeldung/exceptions/classcastexception/CheckedCastsUnitTest.java
index 7fac000fa8..8e62a10e2f 100644
--- a/core-java-modules/core-java-exceptions-3/src/test/java/com/baeldung/exceptions/classcastexception/CheckedCastsUnitTest.java
+++ b/core-java-modules/core-java-exceptions-3/src/test/java/com/baeldung/exceptions/classcastexception/CheckedCastsUnitTest.java
@@ -11,7 +11,7 @@ public class CheckedCastsUnitTest {
         Animal animal = new Frog();
 
         //A checked downcast to Mammal is incompatible from Frog because Frog is not a subtype of Mammal.
-        Mammal mammal = (Mammal) animal;
+        Mammal mammal1 = (Mammal) animal;
     }
 
     @Test(expected = ClassCastException.class)