diff --git a/core-java-modules/core-java-lang-2/src/main/java/com/baeldung/isinstancevsisassignablefrom/IsoscelesTriangle.java b/core-java-modules/core-java-lang-2/src/main/java/com/baeldung/isinstancevsisassignablefrom/IsoscelesTriangle.java
new file mode 100644
index 0000000000..25392320fe
--- /dev/null
+++ b/core-java-modules/core-java-lang-2/src/main/java/com/baeldung/isinstancevsisassignablefrom/IsoscelesTriangle.java
@@ -0,0 +1,5 @@
+package com.baeldung.isinstancevsisassignablefrom;
+
+public class IsoscelesTriangle extends Triangle {
+
+}
diff --git a/core-java-modules/core-java-lang-2/src/main/java/com/baeldung/isinstancevsisassignablefrom/Shape.java b/core-java-modules/core-java-lang-2/src/main/java/com/baeldung/isinstancevsisassignablefrom/Shape.java
new file mode 100644
index 0000000000..c83626a3b6
--- /dev/null
+++ b/core-java-modules/core-java-lang-2/src/main/java/com/baeldung/isinstancevsisassignablefrom/Shape.java
@@ -0,0 +1,5 @@
+package com.baeldung.isinstancevsisassignablefrom;
+
+public interface Shape {
+
+}
diff --git a/core-java-modules/core-java-lang-2/src/main/java/com/baeldung/isinstancevsisassignablefrom/Triangle.java b/core-java-modules/core-java-lang-2/src/main/java/com/baeldung/isinstancevsisassignablefrom/Triangle.java
new file mode 100644
index 0000000000..c35dfd9eca
--- /dev/null
+++ b/core-java-modules/core-java-lang-2/src/main/java/com/baeldung/isinstancevsisassignablefrom/Triangle.java
@@ -0,0 +1,5 @@
+package com.baeldung.isinstancevsisassignablefrom;
+
+public class Triangle implements Shape {
+
+}
diff --git a/core-java-modules/core-java-lang-2/src/test/java/com/baeldung/isinstancevsisassignablefrom/IsInstanceIsAssignableFromUnitTest.java b/core-java-modules/core-java-lang-2/src/test/java/com/baeldung/isinstancevsisassignablefrom/IsInstanceIsAssignableFromUnitTest.java
new file mode 100644
index 0000000000..e0ad264797
--- /dev/null
+++ b/core-java-modules/core-java-lang-2/src/test/java/com/baeldung/isinstancevsisassignablefrom/IsInstanceIsAssignableFromUnitTest.java
@@ -0,0 +1,67 @@
+package com.baeldung.isinstancevsisassignablefrom;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class IsInstanceIsAssignableFromUnitTest {
+    
+    @Test
+    public void whenUsingIsInstanceProperly_desiredResultsHappen() {
+        Shape shape = new Triangle();
+        Triangle triangle = new Triangle();
+        IsoscelesTriangle isoscelesTriangle = new IsoscelesTriangle();
+        Triangle isoscelesTriangle2 = new IsoscelesTriangle();
+        Shape nonspecificShape = null;
+        
+        assertTrue(Shape.class.isInstance(shape));
+        assertTrue(Shape.class.isInstance(triangle));
+        assertTrue(Shape.class.isInstance(isoscelesTriangle));
+        assertTrue(Shape.class.isInstance(isoscelesTriangle2));
+        assertFalse(Shape.class.isInstance(nonspecificShape));
+        
+        assertTrue(Triangle.class.isInstance(shape));
+        assertTrue(Triangle.class.isInstance(triangle));
+        assertTrue(Triangle.class.isInstance(isoscelesTriangle));
+        assertTrue(Triangle.class.isInstance(isoscelesTriangle2));
+        
+        assertFalse(IsoscelesTriangle.class.isInstance(shape));
+        assertFalse(IsoscelesTriangle.class.isInstance(triangle));
+        assertTrue(IsoscelesTriangle.class.isInstance(isoscelesTriangle));
+        assertTrue(IsoscelesTriangle.class.isInstance(isoscelesTriangle2));        
+    }
+    
+    @Test
+    public void whenUsingIsAssignableFromProperly_desiredResultsHappen() {
+        Shape shape = new Triangle();
+        Triangle triangle = new Triangle();
+        IsoscelesTriangle isoscelesTriangle = new IsoscelesTriangle();
+        Triangle isoscelesTriangle2 = new IsoscelesTriangle();
+        
+        assertFalse(shape.getClass().isAssignableFrom(Shape.class));
+        assertTrue(shape.getClass().isAssignableFrom(shape.getClass()));
+        assertTrue(shape.getClass().isAssignableFrom(triangle.getClass()));
+        assertTrue(shape.getClass().isAssignableFrom(isoscelesTriangle.getClass()));
+        assertTrue(shape.getClass().isAssignableFrom(isoscelesTriangle2.getClass()));
+        
+        assertFalse(triangle.getClass().isAssignableFrom(Shape.class));
+        assertTrue(triangle.getClass().isAssignableFrom(shape.getClass()));
+        assertTrue(triangle.getClass().isAssignableFrom(triangle.getClass()));
+        assertTrue(triangle.getClass().isAssignableFrom(isoscelesTriangle.getClass()));
+        assertTrue(triangle.getClass().isAssignableFrom(isoscelesTriangle2.getClass()));
+        
+        assertFalse(isoscelesTriangle.getClass().isAssignableFrom(Shape.class));
+        assertFalse(isoscelesTriangle.getClass().isAssignableFrom(shape.getClass()));
+        assertFalse(isoscelesTriangle.getClass().isAssignableFrom(triangle.getClass()));
+        assertTrue(isoscelesTriangle.getClass().isAssignableFrom(isoscelesTriangle.getClass()));
+        assertTrue(isoscelesTriangle.getClass().isAssignableFrom(isoscelesTriangle2.getClass()));
+        
+        assertFalse(isoscelesTriangle2.getClass().isAssignableFrom(Shape.class));
+        assertFalse(isoscelesTriangle2.getClass().isAssignableFrom(shape.getClass()));
+        assertFalse(isoscelesTriangle2.getClass().isAssignableFrom(triangle.getClass()));
+        assertTrue(isoscelesTriangle2.getClass().isAssignableFrom(isoscelesTriangle.getClass()));
+        assertTrue(isoscelesTriangle2.getClass().isAssignableFrom(isoscelesTriangle2.getClass()));
+    }
+
+}