Adding Elements: To add an element to a stack, call the push() method : Stack « Collections « Java Tutorial

1. Java Tutorial
2. Collections
3. Stack

public Object push(Object element)

This adds the element to the top of the stack or to the end of the vector.

import java.util.Stack;

public class MainClass {
  public static void main (String args[]) {
    Stack s = new Stack();
    s.push("A");
    s.push("B");
    s.push("C");

    System.out.println(s);
  }
}

[A, B, C]