Initial data commit

Task/Stack/Java/stack-2.java

@@ -0,0 +1,29 @@
+public class Stack{
+    private Node first = null;
+    public boolean isEmpty(){
+        return first == null;
+    }
+    public Object Pop(){
+        if(isEmpty())
+            throw new Exception("Can't Pop from an empty Stack.");
+        else{
+            Object temp = first.value;
+            first = first.next;
+            return temp;
+        }
+    }
+    public void Push(Object o){
+        first = new Node(o, first);
+    }
+    class Node{
+        public Node next;
+        public Object value;
+        public Node(Object value){
+            this(value, null);
+        }
+        public Node(Object value, Node next){
+            this.next = next;
+            this.value = value;
+        }
+    }
+}