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diff --git a/TestJavaCollection4.java b/TestJavaCollection4.java
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+// 15 write a java code to demonstrate stack
+import java.util.*;
+public class TestJavaCollection4 {
+  public static void main(String args[]){
+    Stack<String> stack = new Stack<>();
+    stack.push("Ayush");
+    stack.push("Garvit");
+    stack.push("Amit");
+    stack.push("Garima");
+    Iterator<String> itr = stack.iterator();
+    while(itr.hasNext()){
+      System.out.println(itr.next());
+    }
+    String topElement = stack.peek();
+    System.out.println("The top element of the stack is: " + topElement);
+    stack.pop();
+    System.out.println("After POP");
+    for(String element: stack){
+      System.out.println(element);
+    }
+  }
+}