Java Beginner

Course · Software Development · 8 Weeks

A free reading course that teaches Java from the very first line, with no earlier programming needed. Thirteen chapters start with installing Java 21 and running your first program, then cover variables, types and keyboard input, operators and type conversion, decisions with if and switch, loops, methods, arrays and ArrayList, Strings and StringBuilder, classes and objects, inheritance, polymorphism, interfaces, enums and records, the collections framework with sets, maps, stacks and queues, and exceptions with reading and writing files. The course finishes with a guided project, a Student Marks Manager that keeps its data in a file. Every program in the course was compiled and run on a real Java 21 installation, and every output and every compiler or exception message you see is what Java really printed. Every chapter has clear explanations, common mistakes, multiple-choice questions you answer as you read, and practice exercises, with a practice assignment for each chapter and a full answer key. You read at your own pace and type the code yourself.

Program fee: ₹0 (excl. GST). Certificate on completion, tied to a verifiable Intern ID.

Learning Roadmap

  1. Weeks 1-3: The basics: Install Java, write and run your first programs, learn variables, types and input from the keyboard, work with operators and conversions, and make programs decide with if and switch.
  2. Weeks 4-6: Loops, methods, data and text: Repeat work with loops, split programs into methods, store many values in arrays and ArrayList, and handle text with Strings and StringBuilder.
  3. Weeks 7-8: Objects, collections, files and a project: Design classes and objects, use inheritance, interfaces, enums and records, work with sets, maps and queues, handle errors with exceptions and files, and finish with a complete Student Marks Manager.

Syllabus — What You'll Learn

  • Getting Started with Java: the JDK, installing Java 21, your first program, compile and run, the three kinds of mistakes
  • Variables, Types and Input: primitive types, Strings, final, var, printf, reading input with Scanner
  • Operators and Conversion: arithmetic and remainder, casting, overflow, decimal numbers, the Math class
  • Making Decisions: if, else if, comparing Strings, && || !, the ternary operator, switch
  • Loops: while, for, do-while, for-each, break and continue, nested loops, common loop patterns
  • Methods: parameters and return values, overloading, varargs, scope, pass by value, a first look at recursion
  • Arrays and ArrayList: arrays, the Arrays class, two-dimensional arrays, ArrayList, autoboxing, sorting
  • Strings and StringBuilder: searching and cutting text, split and join, comparing, characters, text blocks
  • Classes and Objects: fields, constructors, encapsulation, toString, references, static
  • Inheritance, Interfaces, Enums and Records: extends, overriding, polymorphism, abstract classes, interfaces, enums, records
  • Collections: List, Set, Map, counting and grouping, sorting objects, equals and hashCode, stacks and queues, a first look at streams
  • Exceptions and Files: try, catch, finally, throwing and custom exceptions, try-with-resources, reading and writing text files
  • Final Project: a Student Marks Manager with a menu, a record, a file and tests
  • Answer Key: worked answers to all the chapter exercises, run on real Java 21

Career Opportunities

  • Java Developer (a solid first step into the language)
  • Software Engineer (the base for object-oriented programming)
  • Back-End Developer (Java is widely used for server software)
  • Android Developer (the language foundation to learn before Android apps)
  • Computer Science student (a clear start for college programming courses)