From a813848effa433c2c75b56b67d12129cc1bbd84a Mon Sep 17 00:00:00 2001
From: Aditya <bluenerd@protonmail.com>
Date: Mon, 12 Sep 2022 19:03:24 +0530
Subject: [PATCH] add stack ADT

---
 stack/Stack.java | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 stack/Stack.java

diff --git a/stack/Stack.java b/stack/Stack.java
new file mode 100644
index 0000000..01f757c
--- /dev/null
+++ b/stack/Stack.java
@@ -0,0 +1,19 @@
+/** Stack ADT */
+public interface Stack<E> {
+    /** Reinitialize the stack. The user is responsible for reclaiming the storage used by the stack elements. */
+    public void clear();
+
+    /** Push an element ontp the top of the stack.
+	@param it The element being pushed onto the stack. */
+    public void push(E it);
+
+    /** Remove and return the element at the top of the stack.
+	@return The element at the top of the stack. */
+    public E pop();
+
+    /** @return A copy of the top element. */
+    public E topValue();
+
+    /** @return The number of elements in the stack. */
+    public int length();
+};