How do you do this? JAVA ### Java Stack Implementation Using ArrayList#### ObjectiveThe following Java code demonstrates how to implement a Stack using an `ArrayList`. The goal is to write a method `peek`, which should return the `String` at the top of the Stack without removing it. This solution must utilize only the methods that currently exist in the Stack class.#### Code Explanation```javaimport java.util.*;public class Stack { private ArrayList elements = new ArrayList<>(); public String pop() { if (elements.isEmpty()) { return null; } String top = elements.get(elements.size() - 1); elements.remove(elements.size() - 1); return top; } public void push(String element) { elements.add(element); } public boolean isEmpty() { return elements.isEmpty(); }}```#### Methods in Stack Class1. **pop()**: - **Purpose**: Removes and returns the top element of the Stack. - **Logic**: - If the Stack is empty, return `null`. - Otherwise, retrieve the last element from the `ArrayList` and remove it. - Return the retrieved element. 2. **push(String element)**: - **Purpose**: Adds an element to the top of the Stack. - **Logic**: Append the element to the `ArrayList`.3. **isEmpty()**: - **Purpose**: Checks if the Stack is empty. - **Logic**: Returns `true` if the `ArrayList` is empty, otherwise returns `false`.#### Task: Implementing `peek`You need to implement a `peek` method that returns the top element of the Stack without removing it. Make use of the existing methods in the Stack class.#### Sample Implementation for `peek`Here is a possible implementation for the `peek` method:```javapublic String peek() { if (isEmpty()) { return null; } String top = pop(); push(top); return top;}```#### Explanation of `peek` Method- **Purpose**: Retrieve the top element without removing it from the Stack.- **Logic**: - Check if the Stack is empty using `isEmpty`. If it is, return `null`. - Use the `pop` method to get the top element, which also removes

Java is a programming language that is a high-level programming language it uses Object-oriented…

The following Java code implements a Stack using an ArrayList. Write a method "peek", that returns the String at the top of the Stack without removing the String from the Stack. Write 'peek' using only the methods that currently exist in the Stack class. import java.util.*; public class Stack { private ArrayList elements = new ArrayList<>(); public String pop() { if (elements.isEmpty()) { return null; } String top = elements.get(elements.size() - 1); elements.remove(elements.size() - 1); return top; } public void push (String element) { elements.add(element); } public boolean isEmpty() { } return elements.isEmpty();

The following Java code implements a Stack using an ArrayList. Write a method "peek", that returns the String at the top of the Stack without removing the String from the Stack. Write 'peek' using only the methods that currently exist in the Stack class. import java.util.*; public class Stack { private ArrayList elements = new ArrayList<>(); public String pop() { if (elements.isEmpty()) { return null; } String top = elements.get(elements.size() - 1); elements.remove(elements.size() - 1); return top; } public void push (String element) { elements.add(element); } public boolean isEmpty() { } return elements.isEmpty();

C++ Programming: From Problem Analysis to Program Design

8th Edition

ISBN:9781337102087

Author:D. S. Malik

Publisher:D. S. Malik

Chapter18: Stacks And Queues

Section: Chapter Questions

Problem 3PE

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Question3. Using the Stack class implemented in JAVA, write a JAVA code to do the following: a. Create an array of integers containing the following elements: 5, -1, 7,8,9,4,15 b. Create an empty stack (call it nums) and push all the array elements onto the stack. c. Using a temporary stack to reverse the content of the stack nums then print it. d. Display all odd elements from the stack nums.
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JAVA PROGRAMMING Assume you are trying to implement a stack, and have already implemented a singly- linked list with just a head reference. When implementing the stack using a linked list, you realize you don't need to write very much code at all, because you can just call the linked list methods you have already completed. Match the linked list method you would call in the implementation of each stack operation. 1. addFront 2. addBack isEmpty 3. removeFront push 4. removeBack top 5. getAtlndex 6. contains dod 7. size 8. toString
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JAVA programming question i will attach images of the ourQueue code and the main I have to do the following: *create an ourQueue object, add the following sequence: *2,-3,4,-6,7,8,-9,-11 *create and ourStack object *write a program/ one loop that would result into the stack containing all of the negative number at the bottom and the positive numbers at the top. *outStack at the end should contain the following *[-3,-6,-9,-11,2,4,7,8]
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