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Beginner 9 lessons · free

Java tutorial OOP and backend foundations.

Java — object-oriented programming for backend careers. Every lesson has a complete program with its expected output, key points, a practice task, a quiz and interview questions.

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Lessons

What you'll learn

  1. 01Java introductionWhat Java is used for, the JDK, and the structure of a Java program.
  2. 02Variables & data typesPrimitive types, String, type casting and var.
  3. 03Operators, if & switchComparisons, logical operators, if / else and modern switch expressions.
  4. 04Loops & arraysfor, enhanced for, while, and working with arrays.
  5. 05MethodsDefining methods, parameters, return types and overloading.
  6. 06Classes & objectsFields, constructors, this, encapsulation with getters, and records.
  7. 07Inheritance, interfaces & polymorphismextends, super, @Override, abstract classes and interfaces.
  8. 08Collections & genericsList, Set, Map, generics and a first look at streams.
  9. 09Exceptionstry / catch / finally, checked vs unchecked exceptions and try-with-resources.