JAVA-Daily-Tasks

☕ JAVA-Daily-Tasks

A structured 15-Day Java Practice Repository created to strengthen Java programming fundamentals through daily coding practice.

This repository contains Java programs, problem-solving exercises, practice questions, output screenshots, and day-wise documentation covering Java fundamentals through Object-Oriented Programming, Collections, Exception Handling, File Handling, and Mini Projects.

The goal is to improve Java programming, logical thinking, problem-solving, coding consistency, and preparation for software development interviews through hands-on practice.

📌 About This Repository

This repository documents my Java learning journey from basic programming concepts to practical console-based mini projects.

Each day is organized into the following sections:

📝 Questions — Programming exercises and problem statements
💻 Solutions — Java source code for each problem
🖥️ Screenshots — Program output screenshots
📖 README.md — Daily topics, explanations, and execution instructions

The consistent folder structure makes it easier to review solutions, understand concepts, and track learning progress.

🗓️ 15-Day Java Roadmap

Day	Topic	Status
Day 01	Java Basics	✅ Completed
Day 02	Conditional Statements	✅ Completed
Day 03	Real-World Conditions	✅ Completed
Day 04	Loops	✅ Completed
Day 05	Number Programs	✅ Completed
Day 06	Patterns	✅ Completed
Day 07	Arrays Basics	✅ Completed
Day 08	Arrays Problem Solving	✅ Completed
Day 09	Strings Basics	✅ Completed
Day 10	String Problem Solving	✅ Completed
Day 11	OOP Basics	✅ Completed
Day 12	OOP Advanced	✅ Completed
Day 13	Collections	✅ Completed
Day 14	Exception & File Handling	✅ Completed
Day 15	Mini Projects	✅ Completed

📚 Day-wise Practice

🟢 Day 01 — Java Basics

Introduction to Java syntax and fundamental programming concepts.

Topics covered:

Java program structure
Variables and data types
User input using Scanner
Arithmetic operators
Basic calculations

📂 View Day 01 — Java Basics

🟢 Day 02 — Conditional Statements

Practice decision-making using conditions and operators.

Topics covered:

if, if-else, and else-if
Comparison operators
Logical operators
Nested decision-making
Grade calculation and eligibility conditions
Discounts and electricity bill calculations

📂 View Day 02 — Conditional Statements

🟢 Day 03 — Real-World Conditions

Apply conditional statements to practical scenarios.

Topics covered:

ATM withdrawal conditions
Delivery eligibility
Water usage charges
Ticket pricing
Simple interest
Employee bonuses
Shopping discounts
Parking fees and mobile recharge

📂 View Day 03 — Real-World Conditions

🟢 Day 04 — Loops

Learn how to repeat operations and solve problems using loops.

Topics covered:

for loop
while loop
do-while loop
Number sequences
Multiplication tables
Factorial
Digit counting
Number reversal and digit sums

📂 View Day 04 — Loops

🟢 Day 05 — Number Programs

Develop mathematical logic and number-based problem-solving skills.

Topics covered:

Prime numbers
Palindrome numbers
Armstrong numbers
Perfect numbers
Fibonacci series
Factors
Greatest Common Divisor (GCD)
Least Common Multiple (LCM)
Strong numbers

📂 View Day 05 — Number Programs

🟢 Day 06 — Patterns

Practice nested loops through star and number patterns.

Topics covered:

Star triangles
Inverted triangles
Number triangles
Square patterns
Hollow squares
Pyramids
Inverted pyramids
Floyd’s triangle

📂 View Day 06 — Patterns

🟢 Day 07 — Arrays Basics

Learn how to store and process multiple values using arrays.

Topics covered:

Array creation and initialization
Array input and traversal
Sum and average
Maximum and minimum elements
Even and odd counting
Reversing arrays
Searching and copying arrays

📂 View Day 07 — Arrays Basics

🟢 Day 08 — Arrays Problem Solving

Apply array operations to common programming challenges.

Topics covered:

Finding duplicate elements
Finding a missing number
Frequency counting
Second-largest and second-smallest elements
Removing duplicates
Merging and sorting arrays
Moving zeros
Finding common elements

📂 View Day 08 — Arrays Problem Solving

🟢 Day 09 — Strings Basics

Understand Java Strings and their commonly used operations.

Topics covered:

String creation and input
length()
toUpperCase() and toLowerCase()
charAt()
equals() and equalsIgnoreCase()
String reversal
Palindrome checking
Basic string manipulation

📂 View Day 09 — Strings Basics

🟢 Day 10 — String Problem Solving

Improve string-processing logic through practical exercises.

Topics covered:

String searching
Character frequency
Word counting
String manipulation
Palindrome problems
String-based logical challenges

📂 View Day 10 — String Problem Solving

🟢 Day 11 — OOP Basics

Learn the fundamentals of Object-Oriented Programming in Java.

Topics covered:

Classes and objects
Constructors
Parameterized constructors
this keyword
Encapsulation
Private variables
Static variables
Constructor overloading
Method overloading
Arrays of objects

📂 View Day 11 — OOP Basics

🟢 Day 12 — OOP Advanced

Practice advanced Object-Oriented Programming concepts.

Topics covered:

Single inheritance
Multilevel inheritance
Hierarchical inheritance
Method overriding
super keyword
Abstract classes and methods
Interfaces
Multiple interfaces
Runtime polymorphism

📂 View Day 12 — OOP Advanced

🟢 Day 13 — Collections

Learn how to store, organize, traverse, and manipulate groups of objects.

Topics covered:

ArrayList
LinkedList
HashSet
TreeSet
HashMap
TreeMap
Iterator
Collection sorting
Removing duplicate values

📂 View Day 13 — Collections

🟢 Day 14 — Exception & File Handling

Practice handling runtime errors and working with text files.

Topics covered:

try-catch
Multiple catch blocks
finally
throw
Custom exceptions
FileWriter
FileReader
BufferedReader
IOException
Try-with-resources

📂 View Day 14 — Exception & File Handling

🟢 Day 15 — Mini Projects

Apply the concepts learned throughout the 15-day practice series to small console-based applications.

Mini projects:

Student Management System
Bank Account Management
ATM Simulation
Number Guessing Game
To-Do List Application

Concepts applied:

Java fundamentals
Conditional statements and loops
Classes and objects
Collections
User input
Data validation
Menu-driven applications

📂 View Day 15 — Mini Projects

📂 Repository Structure

JAVA-Daily-Tasks/
│
├── Day-01-Java-Basics/
├── Day-02-Conditional-Statements/
├── Day-03-Real-World-Conditions/
├── Day-04-Loops/
├── Day-05-Number-Programs/
├── Day-06-Patterns/
├── Day-07-Arrays-Basics/
├── Day-08-Arrays-Problem-Solving/
├── Day-09-Strings-Basics/
├── Day-10-String-Problem-Solving/
├── Day-11-OOP-Basics/
├── Day-12-OOP-Advanced/
├── Day-13-Collections/
├── Day-14-Exception-File-Handling/
├── Day-15-Mini-Projects/
│
├── .gitignore
└── README.md

Standard Daily Folder Structure

Each practice day follows a consistent structure:

Day-XX-Topic/
│
├── Questions/
│   └── Questions.txt
│
├── Solutions/
│   ├── Q01_Example.java
│   ├── Q02_Example.java
│   └── ...
│
├── Screenshots/
│   ├── Output_1.png
│   ├── Output_2.png
│   └── ...
│
└── README.md

🖥️ Output Screenshots

Each day’s Screenshots folder contains images of program outputs captured during execution.

The screenshots help demonstrate the results of the practice programs and make the repository easier to review.

Example:

Day-11-OOP-Basics/
├── Questions/
│   └── Questions.txt
├── Solutions/
│   ├── Q01_Student_Class.java
│   ├── Q02_Employee_Constructor.java
│   └── ...
├── Screenshots/
│   ├── Output_1.png
│   ├── Output_2.png
│   └── ...
└── README.md

▶️ How to Compile and Run

Java programs can be compiled and executed using the terminal in VS Code, Command Prompt, or PowerShell.

Prerequisites

Java Development Kit (JDK) installed
Java compiler (javac) available in the system PATH
VS Code or another Java-compatible editor

Verify your Java installation:

java -version
javac -version

Step 1 — Navigate to a Solutions folder

Example for Day 11:

cd "C:\Disk D\Full Stack fol\JAVA-Daily-Tasks\Day-11-OOP-Basics\Solutions"

Step 2 — Compile a Java program

javac Q01_Student_Class.java

Step 3 — Run the program

java Q01_Student_Class

Compile all Java programs in a day’s Solutions folder

javac *.java

After compilation, run each program individually using its class name, without the .java extension.

Note: Some programs require user input. Enter the requested values in the terminal. File-handling programs may also create text files when executed.

🛠️ Technologies Used

☕ Java
💻 Visual Studio Code
🖥️ Command Prompt / PowerShell
🔧 Git
🐙 GitHub

📈 Overall Progress

15 / 15 Days Completed — 100% of the planned practice series

Day 01  ✅ Java Basics
Day 02  ✅ Conditional Statements
Day 03  ✅ Real-World Conditions
Day 04  ✅ Loops
Day 05  ✅ Number Programs
Day 06  ✅ Patterns
Day 07  ✅ Arrays Basics
Day 08  ✅ Arrays Problem Solving
Day 09  ✅ Strings Basics
Day 10  ✅ String Problem Solving
Day 11  ✅ OOP Basics
Day 12  ✅ OOP Advanced
Day 13  ✅ Collections
Day 14  ✅ Exception & File Handling
Day 15  ✅ Mini Projects

🎯 Learning Goals

Through this 15-day Java practice journey, I worked on:

Strengthening Java fundamentals
Improving logical thinking and problem-solving
Practicing conditional statements and loops
Understanding arrays and string manipulation
Learning Object-Oriented Programming
Using Java Collections
Handling exceptions and performing file operations
Building small console-based applications
Maintaining an organized, public coding portfolio
Preparing for further Java development and technical interviews

📌 Repository Status

Status: 15-Day Practice Series Completed

Completed: 15 / 15 Days

Focus: Java Fundamentals, Problem Solving, OOP, Collections, Exception Handling, File Handling, and Mini Projects.

This repository represents my hands-on practice during a structured Java learning plan. I will continue improving the code, documentation, and project quality as I learn more.

🔗 Repository Links

GitHub Repository:
PraveenKumar7545/JAVA-Daily-Tasks

GitHub Pages:
Java Daily Tasks

👨‍💻 Author

Praveen Kumar M

B.Tech — Information Technology

GitHub: @PraveenKumar7545

⭐ If you find this repository useful, feel free to explore the daily practice questions, Java solutions, and mini projects.