diff --git a/src/main/java/myPkg/casting/Casting.java b/src/main/java/myPkg/casting/Casting.java
index 06ab30c..9a99cdf 100644
--- a/src/main/java/myPkg/casting/Casting.java
+++ b/src/main/java/myPkg/casting/Casting.java
@@ -1,16 +1,39 @@
-/*
- * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
- * and open the template in the editor.
- */
-package myPkg.casting;
-
-/**
- *
- * @author laura
- */
-public class Casting {
-
-    public static void main(String[] args) {  
-    }
-}
\ No newline at end of file
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package casting;
+import java.util.*;
+/**
+ *
+ * @author addav
+ */
+public class Casting {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        // TODO code application logic here
+        
+        ArrayList<Object> list = new ArrayList<>();
+        list.add(new Circle(1.0));
+        list.add(new Date());
+        list.add("String");
+        list.add(new Rectangle(2.0, 3.0));
+        
+        for(int i = 0; i<list.size(); i++){
+            if(list.get(i) instanceof Circle){
+                System.out.println("The object is a circle and its radius is "+((Circle)list.get(i)).getRadius());
+            }
+            if(list.get(i) instanceof Date){
+                System.out.println("The object is a date and the date is "+((Date)list.get(i)).toString());
+            }
+            if (list.get(i) instanceof Rectangle){
+                System.out.println("The object is a rectangle and its height its height is "+((Rectangle)list.get(i)).getHeight());
+            }
+        }
+    }
+    
+}
diff --git a/src/main/java/myPkg/inheritance/MyStack.java b/src/main/java/myPkg/inheritance/MyStack.java
new file mode 100644
index 0000000..7e8ed43
--- /dev/null
+++ b/src/main/java/myPkg/inheritance/MyStack.java
@@ -0,0 +1,44 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package testmystack;
+
+import java.util.*;
+
+/**
+ *
+ * @author addav
+ */
+public class MyStack extends ArrayList{
+    private ArrayList<Object> list;
+    
+    @Override
+    public boolean isEmpty(){
+        return super.size() == 0;
+    }
+    
+    public int getSize(){
+        return super.size();
+    }
+    
+    public Object peek(){
+        return super.get(getSize()-1);
+    }
+    
+    public Object pop(){
+        Object a = super.get(getSize()-1);
+        super.remove(getSize()-1);
+        return a;
+    }
+    
+    public void push(Object a){
+        super.add(a);
+    }
+    
+    @Override
+    public String toString(){
+        return "Stack: "+super.toString();
+    }
+}