Draw a UML class diagram for the following code: class Node:     def __init__(self, value):         self.value = value         self.next = None class Stack:     def __init__(self):         self.top = None     def isEmpty(self):         return self.top is None     def push(self, item):         new_node = Node(item)         new_node.next = self.top         self.top = new_node     def pop(self):         if self.isEmpty():             raise Exception("Stack is empty")         popped_item = self.top.value         self.top = self.top.next         return popped_item     def popAll(self):         items = []         while not self.isEmpty():             items.append(self.pop())         return items[::-1]     def peek(self):         if self.isEmpty():             raise Exception("Stack is empty")         return self.top.value # Verification stack = Stack() print("Is stack empty?", stack.isEmpty()) stack.push(10) stack.push(20) stack.push(30) print("Top item:", stack.peek()) print("Popped item:", stack.pop()) print("Popped items:", stack.popAll()) print("Is stack empty?", stack.isEmpty())

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question

Draw a UML class diagram for the following code:

class Node:
    def __init__(self, value):
        self.value = value
        self.next = None

class Stack:
    def __init__(self):
        self.top = None

    def isEmpty(self):
        return self.top is None

    def push(self, item):
        new_node = Node(item)
        new_node.next = self.top
        self.top = new_node

    def pop(self):
        if self.isEmpty():
            raise Exception("Stack is empty")
        popped_item = self.top.value
        self.top = self.top.next
        return popped_item

    def popAll(self):
        items = []
        while not self.isEmpty():
            items.append(self.pop())
        return items[::-1]

    def peek(self):
        if self.isEmpty():
            raise Exception("Stack is empty")
        return self.top.value

# Verification
stack = Stack()
print("Is stack empty?", stack.isEmpty())

stack.push(10)
stack.push(20)
stack.push(30)
print("Top item:", stack.peek())

print("Popped item:", stack.pop())
print("Popped items:", stack.popAll())

print("Is stack empty?", stack.isEmpty())

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