Java Practice Programs

This repository contains my Java learning journey, organized into small programs and exercises. Each file focuses on a specific concept in Java, from the very basics to conditional statements, operators, and simple coding practice problems.

📂 Folder Structure

Java/
│
├── day 1/
│   ├── hello.java              # Basic Hello World program
│   ├── variable.java           # Variable declaration & usage
│   ├── userinput.java          # Taking user input with Scanner
│   ├── q1.java                 # Simple exercise
│
├── day 2/
│   ├── datatype.java           # Working with Java data types
│   ├── comparisonoperator.java # Comparison operators
│   ├── logicaloperator.java    # Logical operators (AND, OR, NOT)
│   ├── checkwhether.java       # Conditional check example
│   ├── ifelse.java             # If-Else statement
│   ├── ifelsecompare.java      # String comparison with equals()
│   ├── Q1.java → Q7.java       # Small practice problems
│   ├── stringcompare.java      # String equality check
│   │
│   └── coding practice/
│       ├── Q1.java
│       ├── Q2.java
│       └── Q3.java
│
├── day 3/
│   ├── elseif.java             # If-Else-If ladder example
│   ├── evenorodd.java          # Check whether a number is even or odd
│   ├── logicaloperator.java    # Logical operators demonstration
│   ├── nestedif.java           # Nested if condition example
│   ├── Q1.java                 # Small practice problem
│   │
│   └── coding challenge/
│       ├── Q1.java
│       ├── Q2.java
│       └── Q3.java
│
├── day 4/
│   ├── ex1.java                # Example 1 program
│   ├── ex2.java                # Example 2 program
│   ├── forloop.java            # For loop demonstration
│   ├── ternaryoperator.java    # Ternary operator usage
│   │
│   └── coding challenge/
│       ├── Q1.java
│       ├── Q2.java
│       ├── Q3.java
│       ├── Q4.java
│       ├── Q5.java
│       └── Q6.java
│
├── day 5/
│   ├── array.java              # Basic array usage
│   ├── example.java            # Example program 1
│   ├── example2.java           # Example program 2
│   ├── nestedforloop.java      # Nested for loop demonstration
│   ├── random.java             # Random number generation
│   ├── whileloop.java          # While loop demonstration
│   │
│   └── coding challenge/
│       ├── Q1.java             # Coding challenge problem 1
│       ├── Q2.java             # Coding challenge problem 2
│       ├── Q3.java             # Coding challenge problem 3
│       ├── Q4.java             # Coding challenge problem 4
│
├── day 6/
│   ├── classobject.java        # Class & object basics
│   ├── dowhileloop.java        # Do-while loop demonstration
│   ├── functions.java          # Functions (methods) example
│   ├── mobile.java             # Class example (Mobile)
│   ├── parameters.java         # Functions with parameters
│   │
│   └── coding challenges/
│       ├── example1.java
│       ├── example2.java
│       ├── example3.java
│       ├── example4.java
│
└── (Compiled .class files are auto-generated after compilation)

🚀 How to Run

1. Compile a Java file

   javac filename.java

2. Run the compiled program

   java filename

   Example:

   javac hello.java
   java hello

📝 Topics Covered

• Basics of Java (Hello World, Variables, Data Types)
• Taking User Input (Scanner class)
• Operators (Arithmetic, Comparison, Logical)
• Control Flow (if, if-else, else-if ladder, nested conditions)
• String Comparison in Java
• Even/Odd Program
• Small Coding Practice Exercises (Q1–Q7)
• Coding Challenges (Day 3)

📖 Learning Purpose

This repository is mainly for:

• Practicing Java syntax and concepts.
• Preparing for coding interviews and exams.
• Building a strong foundation before moving to advanced topics like OOP, Collections, and Exception Handling.

🤝 Contribution

Feel free to fork this repository, add improvements, or share new practice problems!

📜 License

This project is licensed under the MIT License – you are free to use, modify, and distribute.