Java Programming Examples

This repository contains simple Java programs that demonstrate basic Java concepts, including class structure, ArrayList, and LinkedList usage.

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1. Hello World Java Program

Description:
A simple Java program that demonstrates the basic structure of a Java application. The program begins execution from the main method and prints a message to the console.

Program Overview:

• Defines a class named HelloWorld
• Includes the main method, which serves as the entry point of the program
• Uses System.out.println() to display text in the terminal

Purpose:

• Understand how a Java class is created
• Learn how the main method works
• Print output to the console

Output:
Hello, World

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2. Java ArrayList Sorting Program

Description:
Demonstrates how to store numbers in an ArrayList, sort them in ascending order, and display the sorted result.

Program Overview:

• Creates an ArrayList to store integer values
• Adds multiple numbers to the list
• Sorts the list using Collections.sort()
• Prints each sorted number using a loop

Key Concepts Used:

• ArrayList from java.util
• Collections class for sorting
• Enhanced for loop for iteration

Purpose:

• Learn how to use ArrayList in Java
• Understand sorting using Collections.sort()
• Iterate through a collection and print values

Output:
8 12 15 20 33 34

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3. Java LinkedList Program

Description:
Demonstrates the use of a LinkedList to store and manage string elements. Shows how to add elements at specific positions and traverse the list.

Program Overview:

• Creates a LinkedList of String values
• Adds elements to the list
• Inserts an element at a specific index
• Displays the list using a for loop
• Displays the list again using an enhanced for-each loop

Key Concepts Used:

• LinkedList from java.util
• Adding elements and inserting at a specific index
• Accessing elements using index-based iteration
• Iterating using for-each loop

Purpose:

• Understand how LinkedList works in Java
• Learn different ways to traverse a LinkedList
• See how insertion at a specific position affects the list

Output:
Welcome to Java Programming Welcome to Java Programming

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4. Java Stack Program

Description:
Demonstrates the use of the Stack class in Java to store integer values and perform stack operations following the Last In, First Out (LIFO) principle.

Program Overview:

• Creates a Stack of Integer values
• Pushes multiple elements onto the stack
• Uses a while loop to check if the stack is empty
• Removes and prints elements using the pop() method

Key Concepts Used:

• Stack class from java.util
• Stack operations: push(), pop(), isEmpty()
• LIFO data structure
• Looping through stack elements

Purpose:

• Understand how Stack works in Java
• Learn basic stack operations
• Observe LIFO behavior during element removal

Output:
4 3 2 1

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5. Java Queue Program (PriorityQueue)

Description:
Demonstrates the use of a Queue in Java using the PriorityQueue class. Shows how elements are added, displayed, and removed from the queue.

Program Overview:

• Creates a Queue of String values using PriorityQueue
• Adds elements to the queue
• Displays the queue contents
• Removes a specific element using remove()
• Displays the queue after removal

Key Concepts Used:

• Queue interface from java.util
• PriorityQueue implementation
• Queue operations: add(), remove()
• Automatic ordering in PriorityQueue

Purpose:

• Learn how Queue works in Java
• Understand PriorityQueue behavior
• Practice basic queue operations

Output:
[20, 50, 30] After Remove: [30, 50]