Java – 100+ Lab Exercises (Basic, Intermediate, Advanced)

🔰 Basic Level (30+ Exercises)

Goal: Build a strong foundation in Java programming, control structures, and object-oriented concepts.

Java Fundamentals

• Set up Java SDK and IDE (Eclipse/IntelliJ).

• Write your first Java program – “Hello World”.

• Variables and Data Types – create a student info system.

• Type casting and type conversion examples.

• Arithmetic operations and precedence.

Control Structures & Loops

• Even/Odd Number Checker using if/else.

• Switch-case grade evaluator.

• Multiplication table using for loop.

• Prime number checker using while.

• Pattern printing using nested loops (pyramids, diamonds).

Arrays & Strings

• Reverse an array.

• Search and sort arrays.

• Palindrome checker using strings.

• Count vowels, consonants in a string.

• Anagram checker.

Object-Oriented Programming

• Create a Car class with fields and methods.

• Constructor overloading.

• Inheritance example: Animal → Dog.

• Method overriding.

• Abstraction with abstract classes.

🚀 Intermediate Level (40+ Exercises)

Goal: Advance your Java knowledge with design patterns, data handling, collections, and multithreading.

Advanced OOP

• Interface implementation – Shape interface.

• Polymorphism using base and derived classes.

• Use this and super keywords.

• Singleton pattern implementation.

• Use final, static, enum.

Exception Handling

• Try-catch-finally example.

• Custom exception creation and handling.

• Multiple exception handling.

Collections & Generics

• Create and sort a List of objects.

• HashMap usage – phone directory.

• Set operations – unique values.

• Generic class and method implementation.

Multithreading

• Extend Thread class and implement Runnable.

• Thread synchronization example.

• Producer-Consumer problem with wait/notify.

File I/O & Serialization

• Read and write a text file.

• Serialize and deserialize an object.

• Directory traversal utility.

🧠 Advanced Level (40+ Exercises)

Goal: Integrate Java into full-stack development, advanced frameworks, and system-level programming.

JDBC & Database Connectivity

• Connect Java with MySQL.

• CRUD operations using JDBC.

• PreparedStatement usage.

• Transaction management.

Java Networking

• Client-Server communication using Sockets.

• Build a simple chat application.

• URL and HttpURLConnection usage.

Java Collections Deep Dive

• Implement a custom comparator.

• PriorityQueue usage for task scheduling.

• ConcurrentHashMap example.

• LinkedList vs ArrayList benchmark.

Design Patterns

• Factory pattern for object creation.

• Observer pattern for event notification.

• Decorator pattern to enhance functionality.

• Strategy pattern for dynamic behavior change.

Web Development with Servlets & JSP

• Setup Apache Tomcat and create a servlet.

• Form handling using servlet + JSP.

• Session tracking using HttpSession.

• Servlet filter and listener implementation.

Spring Framework (Intro)

• Spring Boot Hello World App.

• RESTful API using Spring Boot.

• Spring Data JPA with MySQL.

• Spring Security login example.

Capstone Projects

• Library Management System (Swing + JDBC)

• Online Food Ordering App (Servlet + JSP + MySQL)

• E-Commerce REST API (Spring Boot + JPA + JWT)

• Chat Application (Socket Programming + Threads)

• Banking System Simulation (OOP + Collections + I/O)

✅ Tools & Environment

• Languages: Java SE 8 / 11 / 17

• Frameworks: Spring Boot, Hibernate

• Databases: MySQL, PostgreSQL

• IDEs: IntelliJ, Eclipse

• Build Tools: Maven, Gradle

• Testing: JUnit, Mockito

• Version Control: Git & GitHub