Java Stack Implementation 🎯

Welcome to our deep dive into the fascinating world of Java Stack Implementation! This lesson is designed for beginners and intermediate learners, so let's get started on our journey to mastering this essential data structure. 📝

What is a Stack? 📝

A Stack is a Linear Data Structure that follows the LIFO (Last In, First Out) principle. It can be imagined as a pile of plates where the last plate added is the first one to be removed.

Understanding Java Stack 💡

In Java, the Stack class is a part of the java.util package. It offers methods to push, pop, peek, and search elements within the stack.

Creating a Java Stack ✅

To create a Stack in Java, you can use the following code:

java

import java.util.Stack;

Stack<Integer> myStack = new Stack<>();

Replace Integer with the type of data you wish to store in your Stack.

Basic Stack Operations 📝

Pushing Elements into the Stack 💡

To add elements to the stack, use the push() method:

java

myStack.push(1);
myStack.push(2);
myStack.push(3);

Popping Elements from the Stack 💡

To remove elements from the stack, use the pop() method:

java

myStack.pop(); // Removes and returns the last element (3)

Peeking at the Top Element 💡

To view the top element without removing it, use the peek() method:

java

int topElement = myStack.peek(); // Returns the last element (3)

Checking the Stack Size 💡

To find the number of elements in the stack, use the size() method:

java

int stackSize = myStack.size(); // Returns the number of elements (2)

Advanced Stack Usage 💡

Searching for Elements 💡

To find an element within the stack, use the search() method:

java

boolean foundElement = myStack.search(2); // Returns true if the element is found, false otherwise

Implementing Custom Stack 💡

If you prefer implementing your own Stack, you can create a custom class and use an ArrayList to store the elements:

java

import java.util.ArrayList;

class CustomStack<T> {
    private ArrayList<T> myStack;

    public CustomStack() {
        myStack = new ArrayList<>();
    }

    // Implement methods for push, pop, peek, search, and size here
}

Java Stack Implementation 🎯

Java Stack Implementation 🎯

What is a Stack? 📝

Understanding Java Stack 💡

Creating a Java Stack ✅

Basic Stack Operations 📝

Pushing Elements into the Stack 💡

Popping Elements from the Stack 💡

Peeking at the Top Element 💡

Checking the Stack Size 💡

Advanced Stack Usage 💡

Searching for Elements 💡

Implementing Custom Stack 💡

Quiz Time 🎯